1. What volume is shown in the graduated cylinder below?
40
mL
20
ml
O A. 20.4 mL
O B.24.0 mL
O C. 28 ml
OD. 30 ml
Answers
The volume shown in the graduated cylinder according to the image would 28 mL. Thus, the correct option would be C.
In the cylinder, the top of the liquid formed a concave meniscus with the walls of the cylinder. Thus, the bottom of the meniscus would be read as this is the normal rule.
The rule is such that for liquids that form concave meniscus with the walls of cylinders, the bottom of the meniscus is read while it is the top of the meniscus for liquids that form convex meniscus with the walls of cylinders.
Hence, looking at the image, the bottom of the concave is on the 28 mL mark on the cylinder.
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Related Questions
If 9000. J of heat are absorbed by 800. g of water at 25.0oC, what will be its final temperature?
Answers
Answer:
22 626 000 J. = 22 626 kJ. 4. If 9000 J of heat are absorbed by 800 g of water at 5.0 o. C, what maximum temperature will the water attain? Q = mc ∆T.
Explanation:
The final temperature can be calculated using the calorimetric equation. Here, the final temperature of water is 27.71 °C.
What is calorimetric equation ?The calorimetric equation connecting the heat energy absorbed or released q by a system with the mass m, temperature difference ΔT and the specific heat capacity c as follows:
q = m c ΔT
The specific heat capacity of water = 4.15 J/ °C g.
given that heat energy absorbed q = 9000 J
mass = 800 g
initial temperature = 25 °C.
Then,
9000 J = 4.15 J/ °C g. × 800 g (25 °C + T)
then T = [ 9000 J/ 4.15 J/ °C g. × 800 g ] + 25 °C = 27.71 °C.
Therefore, the final temperature of water is 27.71 °C.
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what mass would occupied by 120 mole of argon gas at stp
Answers
Answer:
mass=8,640g
Explanation:
\(n = \frac{mass}{molar \: mass} \)
where
mole(n)= 120mol
Molar mass = Ar2
= 36×2
= 72g/mol.
Mass = ?
Therefore mass =
\(120 = \frac{m}{72} . \\ 120 \times 72 = m \\ 8640g = m\)
an asrnout in space might fell weighless but there still gravitaional attraction between the astournout and earth . Which to factor affect this gravitanol attraction
Answers
Answer:
When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.
while taking the prescribed antihyperlipidemic, which serum laboratory value requires intervention? tsh 3.9 mclu/ml (3.9 miu/l). alt 60 u/l (1.0 mckat/l). amylase 44 u/l (0.73 mckat/l). potassium 4.8 meq/l (4.8 mmol/l).
Answers
Antihyperlipidemic Drugs are the drugs which lowers the serum levels of cholesterol and various lipids.
Atorvastatin which is also called as Lipitor is the most commonly prescribed antihyperlipidemic drug. These drugs are also called as lipid-lowering agents. This provides an effective treatment for hyperlipidemia which increased lipid level in the blood. This drug is used for the incidence of coronary artery disease (CAD) which is the most common cause of death among adults that is higher in people with hyperlipidemia. It is detected that the high level of lipids and triglyceride is associated with metabolic syndrome that consists of insulin resistance, abdominal obesity, hypertension and proinflammatory and prothrombotic states.
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The correct question is,
What are antihyperlipidemic drugs for?
Which is the balanced equation for S8 O2 → SO2? S8 O16 → 8SO2 S8 O2 → S8 O2 S8 O2 → S8O2 S8 8O2 → 8SO2.
Answers
Balanced Chemical Equation is defined as the equation in which the number of atoms on the reactants side and number of atoms on the product side is equal.
What is the balanced chemical equation?A balanced Chemical Equation is a reaction representing an equal number of atoms participating on the reactant and product sides. For example, a balanced chemical reaction between sulfur and oxygen will form the product sulfur dioxide. The balanced equation will be:\(\rm S_8 + O_2 \rightarrow 8 SO_2\)In the above equation, 8 atoms of sulfur and 2 atoms of oxygen are participating. On the product side, the balanced equation will be formed by adding 8 in front of sulfur.Thus, the balanced equation of the sulfur and oxygen will be
\(\rm S_8 + O_2 \rightarrow 8 SO_2\).
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Answer:
It is D
Explanation
In philosophy there is a lot of emphasis on what exists. We call this ontology, which means, the study of being. What is less often examined is what does not exist.
It is understandable that we focus on what exists, as its effects are perhaps more visible. However, gaps or non-existence can also quite clearly have an impact on us in a number of ways. After all, death, often dreaded and feared, is merely the lack of existence in this world (unless you believe in ghosts). We are affected also by living people who are not there, objects that are not in our lives, and knowledge we never grasp.
Upon further contemplation, this seems quite odd and raises many questions. How can things that do not exist have such bearing upon our lives? Does nothing have a type of existence all of its own? And how do we start our inquiry into things we can’t interact with directly because they’re not there? When one opens a box, and exclaims “There is nothing inside it!”, is that different from a real emptiness or nothingness? Why is nothingness such a hard concept for philosophy to conceptualize?
Let us delve into our proposed box, and think inside it a little. When someone opens an empty box, they do not literally find it devoid of any sort of being at all, since there is still air, light, and possibly dust present. So the box is not truly empty. Rather, the word ‘empty’ here is used in conjunction with a prior assumption. Boxes were meant to hold things, not to just exist on their own. Inside they might have a present; an old family relic; a pizza; or maybe even another box. Since boxes have this purpose of containing things ascribed to them, there is always an expectation there will be something in a box. Therefore, this situation of nothingness arises from our expectations, or from our being accustomed. The same is true of statements such as “There is no one on this chair.” But if someone said, “There is no one on this blender”, they might get some odd looks. This is because a chair is understood as something that holds people, whereas a blender most likely not.
The same effect of expectation and corresponding absence arises with death. We do not often mourn people we only might have met; but we do mourn those we have known. This pain stems from expecting a presence and having none. Even people who have not experienced the presence of someone themselves can still feel their absence due to an expectation being confounded. Children who lose one or both of their parents early in life often feel that lack of being through the influence of the culturally usual idea of a family. Just as we have cultural notions about the box or chair, there is a standard idea of a nuclear family, containing two parents, and an absence can be noted even by those who have never known their parents.
This first type of nothingness I call ‘perceptive nothingness’. This nothingness is a negation of expectation: expecting something and being denied that expectation by reality. It is constructed by the individual human mind, frequently through comparison with a socially constructed concept.
Pure nothingness, on the other hand, does not contain anything at all: no air, no light, no dust. We cannot experience it with our senses, but we can conceive it with the mind. Possibly, this sort of absolute nothing might have existed before our universe sprang into being. Or can something not arise from nothing? In which case, pure nothing can never have existed.
Part A Read each sentence. Write the letter of the correct answer on the line.
1. Which of the following would result in a chemical change?
A boiling water
C tearing paper
B burning wood
D melting wax
Answers
Gallium is a metallic element in Group III. It has similar properties to aluminium.
(a) (i) Describe the structure and bonding in a metallic element.
Answers
Metallic elements exist in a solid-state and they are opaque, have a shiny surface, good conductors of electricity and heat, malleable and ductile, and are dense. The structure of metals is formed by atoms that are held together by metallic bonds. These atoms have loosely bound valence electrons that can be shared between the neighboring atoms.
Therefore, the outermost shells of these atoms are incomplete due to the sharing of valence electrons, forming a lattice structure known as a metallic bond.Metallic elements have a unique crystal structure that occurs in two forms. The most common type of metal crystal structure is the body-centered cubic structure where the atoms are arranged in a cube with one atom located at the center of the cube. The other type of metal crystal structure is the face-centered cubic structure, where each corner of the cube is an atom and there is an additional atom at the center of each face of the cube .Metallic bonding occurs due to the delocalized electrons that exist in the metal structure. The valence electrons from each atom are free to move throughout the entire metal lattice. Therefore, these electrons form a "sea of electrons" that is shared by all the atoms in the lattice. This results in the metal structure having high thermal and electrical conductivity.Metals are known for their ductility and malleability properties. These properties are due to the metallic bonding that exists in the metal structure. Since the valence electrons are shared, they can easily move past one another, allowing the metal to be hammered into different shapes without breaking.The properties of metals vary depending on their structure and bonding. Gallium, being a metallic element in Group III, has similar properties to aluminum. Therefore, it has a similar metallic bond structure with delocalized electrons that provide the metal with its unique properties.For such more question on valence electrons
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What force opposes gravity and keeps objects from falling to the center of
the earth?
Answers
La fuerza de la gravedad depende de la masa (el peso) de cada objeto. La fuerza con que se atraen dos objetos es proporcional a su masa y disminuye rápidamente en el momento en que los separamos. De hecho, nosotros también atraemos objetos con ‘nuestra’ fuerza gravitatoria, pero pesamos tan poco que no podemos percibirlo. En cambio, el Sol es tan grande que es capaz de mantenernos girando a su alrededor a pesar de estar muy lejos. La Luna también ejerce su propia fuerza gravitatoria, pero, como es más pequeña y ligera que la Tierra, si nos pesásemos sobre su superficie veríamos que pesamos unas seis veces menos que en la Tierra.
Podríamos preguntarnos por qué la Luna no cae sobre la Tierra al igual que una manzana cae del árbol. La razón es que nuestro satélite nunca está quieto. Se mueve constantemente a nuestro alrededor. Sin la fuerza de atracción terrestre, se alejaría flotando en el espacio. Gracias a esta combinación de velocidad y distancia de nuestro planeta, la Luna siempre está en equilibrio, ni cae ni se aleja. Si se moviera más rápido, se alejaría, si se moviera con más lentitud, ¡caería!
Hemos dicho que la fuerza de la gravedad también depende de la distancia. Si nos alejásemos lo suficiente de la Tierra, escaparíamos a su fuerza de atracción. Y eso es lo que tratamos de hacer con las naves espaciales. Necesitamos superar la llamada ‘velocidad de escape’, que es aproximadamente 11,2 km/s (a esa velocidad, podríamos viajar de Londres a Nueva York ¡en tan solo 10 minutos!). Cuando un cohete alcanza esa velocidad, ya es libre para viajar por el sistema solar.
Dentro de una nave en órbita, no sentimos la fuerza de la gravedad terrestre. Los objetos no caen, sino que flotan, así que si saltas, no regresas al suelo. Es lo que les ocurre a los astronautas cuando están a bordo de una estación espacial que orbita alrededor de la Tierra.
Which is the name of O3?
dioxide
oxygen
trioxygen
monoxide
Answers
The answer is C, Trioxygen
The name for O₃ molecule is trioxygen as it is made up of three oxygen atoms.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Studies have found that lab coats are typically washed every 1 to 2 weeks. These lab coats often contain harmful germs that can be transmitted to patients during routine examinations. If this happens, the infection would be considered
congenital.
iatrogenic.
morbid.
nosocomial.
asymptomatic.
zoonotic.
Answers
Answer:
The answer is nosocomical.
Explanation:
It was transmitted from a hospitial.
Select the correct location on the image.
Identify the apparatus on the table that is best suited for a chemist to measure the volume of a liquid.
Answers
Answer:
The third one from the left–the graduated cylinder.
Explanation:
The laboratory apparatus that gives an "accurate" or "precise" measurement of a liquid's volume is the graduated cylinder. All you have to do is to pour the liquid into the cylinder and read its measurement using the calibrated scale.
The graduated cylinder comes in different sizes, which means the scale divisions will depend on its size. When reading the measurement, it is important to take note to read at the bottom of the meniscus because it gives the most accurate volume.
Answer:
graduated cylinder
Explanation:
The probability that a system is in a particular state after a large number of periods is a. independent of the beginning state of the system. b. the same for every ending system. c. dependent on the beginning state of the system. d. equal to one half.
Answers
The probability that a system is in a particular state after a large number of periods is dependent on the beginning state of the system.
This is because the probability of transitioning from one state to another is influenced by the current state of the system.
However, as the number of periods increases, the probability of being in a particular state tends to converge to a fixed value, known as the steady-state probability.
This steady-state probability is not necessarily the same for every ending system, as it depends on the transition probabilities between states.
The probability of being in a particular state after a large number of periods can be calculated using Markov chain analysis, which considers the probabilities of transitioning between states over time.
Therefore, options a and d are incorrect, while options b and c partially capture the nature of the system's probability distribution.
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The blending of two different alleles to create a third unique phenotype. Example: snapdragon: red X white --- > pink
Answers
So, incomplete dominance is a type of genetic inheritance where the phenotype of a heterozygous individual is an intermediate between the two homozygous phenotypes.
The term for the blending of two different alleles to create a third unique phenotype is incomplete dominance.
In the example of snapdragons, the alleles for flower color are represented by R (for red) and W (for white). When a plant with the RR genotype (homozygous dominant) is crossed with a plant with the WW genotype (homozygous recessive), the resulting offspring all have the RW genotype (heterozygous).
In incomplete dominance, the heterozygous phenotype is intermediate between the two homozygous phenotypes. In this case, the flower color of the heterozygous snapdragons is pink, which is intermediate between the red color of the RR homozygotes and the white color of the WW homozygotes.
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what volume of a 0.280 m solution of kbr is needed to precipitate 13.0 g of agbr from a solution containing 0.490 mol of agno3 .
Answers
A 0.280M solution of \(KBr\) in 16.743 L where 13.0 g of \(AgBr\) must be precipitated in order to from an \(AgNO3\) solution with 0.490 mol
Given the concentration of \(KBr\) = 0.280M
The mass of \(AgBr\) = 13g
The number of moles of \(AgNO3\) is = 0.490
The volume of \(KBr\) required = V
The volume of a 0.280 m solution of \(KBr\) needed to precipitate 13.0 g of \(AgBr\) from a solution containing 0.490 mol of \(AgNO3\) is calculated using the following equation:
\(KBr+AgNO3--- > AgBr+KNO3\)
Volume (L) = (Moles * Molar Mass \(AgBr\)) / (Molarity \(KBr\))
Volume (L) = (0.490 * (107.8682)) / (0.280 mol/L)
Volume (L) = 16.743 L
As a result, 13.0 g of AgBr must be precipitated from a solution containing 0.490 mol of \(AgNO3\) using 16.743 L of a 0.280 m solution of \(KBr\).
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How do mass and type of material affect thermal energy transfer?
Answers
Answer:
Temperature, mass, and the type of material are factors that affect the thermal energy of an object.
Material with the higher specific heat will have more thermal energy than material with lower specific heat if they both have the same mass and temperature.
The thermal energy within the thing increases if the temperature remains constant but the object's mass rises.
If two materials have the same mass and temperature, the material with the greater specific heat will have more thermal energy than the material with the lower specific heat.
How does thermal energy transfer depend on the kind of material?
The speed at which thermal energy moves from one end of a substance to another determines thermal conductivity. Insulators transport thermal energy slowly while conductors transfer thermal energy quickly.
The thermal energy within the thing increases if the temperature remains constant but the object's mass rises.
Conduction, convection, or radiation are all ways that thermal energy can be moved from one location to another.
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molecules move in random directions when heated in a heat engine, and because of the lack of uniformity in direction of molecular movement, true or false
Answers
The statement "molecules move in random directions when heated in a heat engine, and because of the lack of uniformity in the direction of molecular movement" is true.
When a heat engine is heated, molecules absorb heat energy and their kinetic energy increases. The kinetic energy of molecules causes them to move around. However, this movement is not uniform, and the molecules move in random directions.
A heat engine is a device that converts thermal energy into mechanical energy. Heat engines operate on the principle of thermodynamics.
They work by taking in thermal energy from a high-temperature reservoir, converting some of it into mechanical energy, and then releasing the remaining thermal energy to a low-temperature reservoir.The internal combustion engine in a car, the steam engine in an old locomotive, and the turbine in a power plant are all examples of heat engines. They all convert heat energy into mechanical energy to perform work.
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The atmospheric pressure is highest at...
Answers
Answer: Sea Level
Explanation: facts
We need help thinking of a project for a science fair, our questions are: “What is going to happen to the climate in the Future”, “Why can climate affect people’s health” and “How does the changing climate affects all living things”
Answers
Answer:
1.what is going to happen to the climate in the future?
2.why can climate affect people's health?
3.how does the changing climate affect all human beings?
Explanation:
1. if we are not thinking about the climate or incase the global warming increases it can cause flood in coastal areas and the ice Berks in the polar regions may melt and cause the sea level to increase.
2.if the climate becomes worse it can kill many people some people can get respiratory diseases . as most fuels we use produces harmful products it's can cause pollution and can kill many people
3.if the climate changes some animals can't adapt to the climate and they can even get extinct and as the climate change may result in many natural disasters it can also kill people
that's why it is very important to take care of the environment and climate
hope you understood
What are ionic bonds and the minerals that make up this
category?
Answers
Ionic bonds are a type of chemical bond that occurs between two atoms when one or more electrons are transferred from one atom to another.
Understanding Ionic BondsIonic Bond involves the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions) that are formed as a result of this electron transfer.
Here are a few examples of minerals that are classified as ionic compounds:
1. Sodium Chloride (NaCl): Commonly known as table salt, sodium chloride is a mineral formed by the ionic bonding between sodium cations (Na+) and chloride anions (Cl-).
2. Calcium Carbonate (CaCO₃): Calcium carbonate is a mineral found in various forms, including limestone, chalk, and marble. It is composed of calcium cations (Ca²⁺) bonded to carbonate anions (CO₃²⁻).
3. Potassium Feldspar (KAlSi₃O₈): Potassium feldspar is a group of minerals that includes orthoclase, microcline, and sanidine. It consists of potassium cations (K+) bonded to aluminum silicate anions (AlSi₃O₈).
4. Magnesium Sulfate (MgSO₄): Magnesium sulfate, also known as Epsom salt, is an ionic compound composed of magnesium cations (Mg²⁺) bonded to sulfate anions (SO₄²⁻).
5. Iron Oxide (Fe₂O₃): Iron oxide is a mineral category that includes compounds such as hematite and magnetite. It consists of iron cations (Fe³⁺) bonded to oxide anions (O₂⁻).
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describe what sort of problems would occur in the experiment if the copper electrodes were completely covered by water. how would these problems look in your readings?
Answers
The experiment would not function properly if the copper electrodes were totally submerged in water because then there would be no way for the electrical current to travel through the solution.
If the copper electrodes were completely covered by water, the electrical current would not be able to pass through the solution, and the experiment would not work properly. As a result, no reduction or oxidation reaction would occur, and the electrochemical cell would not produce any voltage or current.
This would be visible in the readings as a flat line or zero voltage or current reading on the voltmeter or ammeter. Additionally, the copper electrodes could corrode or dissolve in water over time, leading to inaccurate readings or a loss of the electrodes altogether.
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why does hydrogen bonding lead to alpha helices
Answers
In terms of the specific question asked, hydrogen bonding leads to alpha helices because it stabilizes the structure of proteins.
Hydrogen bonds can form between the carbonyl and amino groups in a protein backbone, which results in the formation of a helix structure.
This helix structure is the alpha helix, and it is a common protein secondary structure.
The hydrogen bonds that form between the carbonyl and amino groups are responsible for the stability of the alpha helix, and without these hydrogen bonds, the structure would be unstable and could not exist.
Therefore, hydrogen bonding is essential to the formation of alpha helices in proteins.
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Decane (C10H22) is used in diesel. The combustion for decane follows the equation: 2 C10H22 + 31 O2 à 20 CO2 + 22 H2O. Calculate the amount, in grams, of water (H2O) produced by the combustion of 568 grams of decane (C10H22) with 2976 grams of oxygen gas (O2). 692 792 892 992
Answers
The mass of water produced is 792 grams by the combustion of 568 grams of decane.
Given:
Combustion of 568 grams of decane with 2979 grams of oxygen.
\(2 C_{10}H_{22 }+ 31 O_2 \rightarrow 20 CO_2 + 22 H_2O\)
To find:
The mass of water produced by combustion of 568 grams of decane.
Solution:
Mass of decane = 568 g
Moles of decane :
= \(\frac{568 g}{142 g/mol}=4 mol\)
Mass of oxygen gas = 2976 g
Moles of oxygen gas:
= \(\frac{2976 g}{32 g/mol}=93 mol\)
\(2 C_{10}H_{22 }+ 31 O_2 \rightarrow 20 CO_2 + 22 H_2O\)
According to reaction, 2 moles of decane reacts with 31 moles of oxygen, then 4 moles of decane will react with:
\(=\frac{31}{2}\times 4mol=62\text{ mol of}O_2\)
But according to the question, we have 93.0 moles of oxygen gas which is more than 62 moles of oxygen gas.
So, this means that oxygen gas is present in an excessive amount. Which simply means:
Oxygen gas is an excessive reagent.Decane is a limiting reagent.Decane being limiting reagent will be responsible for the amount of water produced after the reaction.According to reaction, 22 moles of water is produced from 2 moles of decane, then 4 moles of decane will produce:
\(=\frac{22}{2}\times 4mol=44\text{mol of }H_2O\)
Mass of 44 moles of water ;
\(=44mol\times 18g/mol=792g\)
792 grams of water is produced by the combustion of 568 grams of decane.
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How many moles of carbon dioxide (CO2) is produced when 76.9 g of oxygen (O2) is consumed when butane is burned? The balanced equation is 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O. Show all of your work for full credit.
Answers
2 C4H10 + 13 O2 → 8 CO2 + 10 H2O.
Which of the following steps correctly converts 1.25 moles of fluorine to an equivalent mass of fluorine in grams? (5 points)
Add 1.25 to the atomic mass of fluorine.
Divide the atomic mass of fluorine by 1.25.
Subtract 1.25 from the atomic mass of fluorine.
Multiply the atomic mass of fluorine by 1.25.
Answers
Explanation:
Given the amount of fluorine is ---- 1.25 mol.
What is the mass of given fluorine in grams?
Since
\(Number of moles =\frac{given mass of the substance}{its molecular mass}\)
To get the mass of the substance in grams, multiply the given number of moles with the molecular mass of the substance.
Hence, among the given options, the correct answer is the last option that is
Multiply the atomic mass of fluorine by 1.25.
Answer:
Multiply the atomic mass of fluorine by 1.25.
Explanation:
i got it right on the exam!! :)
What is true about graphs? a. They are created from data tables b. Give a visual representation of the data c. Valid conclusions depend on clear interpretation of the data d. All of the above
Answers
Here, the true statement about the graph is, option: (d) All of the above is correct .
A graph is a diagram that depicts the connections between two or more objects. A pie chart is a type of graph. The data can be displayed using graphs or tables. Both can be used to draw conclusions about the data as well. Both should be set up such that details regarding the frequencies of the various data categories may be discovered.Therefore ,these visual representations include tables and graphs. They are employed to arrange data in order to highlight patterns and correlations. This information is displayed as a shape on a graph. To present the results of their research, scientists and researchers frequently employ tables and graphs.
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TIMED HELP ASAP
19.11 g of MgSO₄ is placed into 100.0 mL of water. The water's temperature increases by 6.70°C. Calculate ∆H, in kJ/mol, for the dissolution of MgSO₄. (The specific heat of water is 4.184 J/g･°C and the density of the water is 1.00 g/mL). You can assume that the specific heat of the solution is the same as that of water.
Answers
Answer:
TIMED HELP ASAP
19.11 g of MgSO₄ is placed into 100.0 mL of water. The water's temperature increases by 6.70°C. Calculate ∆H, in kJ/mol, for the dissolution of MgSO₄. (The specific heat of water is 4.184 J/g･°C and the density of the water is 1.00 g/mL). You can assume that the specific heat of the solution is the same as that of water.
Answer:
-21.03 kJ/mol
Explanation:
∆H is enthalpy. Enthalpy is the total heat content of a system.
So we can establish that ∆H = q (heat)
The formula for heat (q)
q = cm∆T
c = specific heat capacity
m = mass of substance
∆T= change of temperature
Since we are calculating the enthalpy of the SOLUTION. We must account for both the mass of water and the mass of MgSO₄ in our q formula.
All you gotta do is plug and chug at this stage.
∆H = q = cm∆T = (4.184)(19.11+100.0)(6.70) = 3338.986808 Joules
We have now calculated the heat (aka enthalpy) of the solution.
BUT
Remember! The problem asked for enthalpy in kj....
Use this conversion factor.
1000 J = 1 kJ
3338.986808 Joules * 1kJ/1000 J = 3.338986808 kJ
We were asked to find ∆H for the dissolution of MgSO4 in units of kj/mol so we are not finished.
Take the grams of MgSO4 in the problem and convert it into moles using its molar mass.
MgSO4 molar mass = 120.3676 g
1 mol = 120.3676 g MgSO4 <---- Use this as a conversion factor
19.11 g MgSO4 * 1 mol MgSO4/120.3676 g = 0.15876365 mol MgSO4
Now that you've calculated the moles of MgSO4 in this solution. You can divide your heat by it.
q dissolution = 3.338.986808 kJ/ 0.15876365 mol = 21.03 kj/mol
Note that the problem tells us that the temperature of water increases.
This means that the water is experiencing an endothermic process (heat is being absorbed from MgSO4) . Mathematically, this would be indicated by a positive sign. ---> +q
We can assume MgSO4 is losing heat as it is placed into the water. It is experiencing an exothermic process (heat is being lost). Mathematically, this would be indicated by a negative sign. ----> -q
So if we're calculating the enthalpy for the dissolution of MgSO₄ ....the value we've arrived at must be negative.
Answer
∆H = 21.03 kj/mol :)))))
I hope that helped...I feel like my explanation was a bit convoluted.
Which of these is a way that bio stimulation can be used ?
Answers
Answer:
To combat the spread of invasive species
hope that helped <3
Calculate the kinetic energy of a 100kg cart moving at a speed of 6 m/s.
Answers
The kinetic energy of a cart weighing 100kg moving at a speed of 6 m/s is 1800 J.
Kinetic energy is defined as the energy that an object has because of its motion. If you want to accelerate an object, then you must apply a force. Force can be applied when work is done by us. After work has been done, the energy will get transferred to the object, and the object will be moving with a new constant speed.
Formula for kinetic energy is given as,
K.E = 1/2 mv²
m = 100 kg
v = 6 m/s
Substituting the values we get,
K.E = 1/2 × 100 × 6 × 6
⇒ K.E = 1800 J
Hence, The kinetic energy of a 100kg cart moving at a speed of 6 m/s is 1800 J.
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A formula for the relationship between weight and blood pressure in children is given by the formula below where P(x) is measured in millimeters of mercury and x is measured in pounds. Use the formula to answer the questions. P(x)=17.9(9+lnx)10≤x≤100 What is the rate of change of blood pressure with respect to weight at the 60-pound weight level? The rate of change at the 60-pound weight level is approximately mm/ pound. (Do not round until the final answer. Then round to the nearest hundredth as needed.) What is the rate of change of blood pressure with respect to weight at the 70-pound weight level? The rate of change at the 70-pound weight level is approximately mm/ pound. (Do not round until the final answer. Then round to the nearest hundredth as needed.)
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The formula for the relationship between weight and blood pressure in children is:
P(x) = 17.9(9 + ln x) 10 ≤ x ≤ 100To find the rate of change of blood pressure with respect to weight at the 60-pound weight level.We differentiate the above function with respect to x Therefore:
dP/dx = 17.9(1/x)Now substituting x = 60 in the above equation, we get: dP/dx = 17.9(1/60) dP/dx = 0.298The rate of change at the 60-pound weight level is approximately 0.30mm/ pound.Rate of change at the 70-pound weight level:
Similarly, we can find the rate of change at 70-pound weight level, by differentiating the function P(x) with respect to x. Therefore, dP/dx = 17.9(1/x)Now substituting x = 70 in the above equation, we get:dP/dx = 17.9(1/70) dP/dx = 0.2557The rate of change at the 70-pound weight level is approximately 0.26mm/ pound.About BloodBlood is a fluid found in all living things that functions to deliver substances and oxygen needed by body tissues, transports chemical products of metabolism, and also acts as the body's defense against viruses or bacteria. Blood has the function of regulating acid and base balance. ,transports O2, carbohydrates, and metabolites, regulates body temperature by conduction or conduction, carries body heat from heat production centers (liver and muscles).
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The lab experiment instructs you to react 0.21 g of nahco3 with excess ch3cooh. how much co2 in ml would this reaction generate if all the sodium bicarbonate reacts fully?
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The reaction generates 97.02 mL of CO₂.
To find the amount of CO₂ produced, follow these steps:
1. Determine the moles of NaHCO₃ using its molar mass (23+1+12+48 = 84 g/mol): 0.21 g / 84 g/mol ≈ 0.0025 mol.
2. In the reaction, 1 mol NaHCO₃ produces 1 mol CO₂, so 0.0025 mol NaHCO₃ produces 0.0025 mol CO₂.
3. Calculate the volume of CO₂ at STP (1 mol = 22.4 L): 0.0025 mol * 22.4 L/mol ≈ 0.056 L.
4. Convert liters to milliliters: 0.056 L * 1000 mL/L = 56 mL.
Approximately 97.02 mL of CO₂ will be generated if all the sodium bicarbonate reacts fully.
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