What is the most common element in earths crust
a.iron
b.oxygen
c.carbon
d.aluminum

Answer:

look below

Explanation:

If the temperature of a gas in a sealed container with a fixed number of molecules is increased, the gas will expand. This is because the increased temperature will cause the gas molecules to move more quickly and collide more frequently with the walls of the container. These collisions will exert a greater force on the walls of the container, causing the volume of the container to increase.

If the volume of the container is allowed to vary (i.e., if it is not sealed), then the volume of the container will increase as the temperature is increased. The exact increase in volume will depend on the size of the container and the specific gas that is being heated.

If the temperature of a gas in a 2.0 L sealed container is doubled, the volume of the container will increase, but it is not possible to determine the exact increase in volume without knowing the specific gas that is being heated and the pressure and temperature at which the gas was originally contained.

Answer:

they both revolve or rotate around something

Explanation:

The earth revolves around the sun and the moon rotates around the earth.

a.) If too many samples are used – a larger sample size reduces the variability of the sample distribution.

As the sample size increases, the shape of the sampling distribution becomes closer to the normal distribution, regardless of the shape of the population.

b.) If too few samples are used - the samples may interfere with the extrapolation of the results.

Small sample sizes can make it difficult to determine whether certain results are true, and in some cases can lead to Type II errors. H. The null hypothesis was erroneously accepted and no differences between study groups were reported.

c.) If you use a solvent that is too polar - if the solvent is too polar, the components will not move well enough to separate again (Rf too small). The eluent is more or less polar. It should not be so polar as to dissolve the alumina or silica.

d.) When attempting to elute a spot of crystalline material that is only partially soluble in the eluent-  the material migrates through the stationary phase as a streak rather than as a single spot.

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The prices of the different units of volume and mass of mercury are as follows:

a. Price of one pound of mercury = $2.059

b. Price of 1 g of mercury = $0.00454

c. Price of 1 cm³ of mercury = $0.0614

d. Price of 1 in³ of mercury is $0.996

The price of the intermediate volumes of Mercury are determined as follows:

a. Price of 76.00 pound flask of mercury = $156.50

Price of one pound of mercury =  $156.50/76

Price of one pound of mercury = $2.059

b. 1 pound = 453.592 g

76 pounds = 76 * 453.592 g = 34473 g

Price of 1 g of mercury = $156.50/34473

Price of 1 g of mercury = $0.00454

c. Volume of 34473 g of mercury = 34473/13.534

Volume of 34473 g of mercury = 2547.14 cm³

Price of 1 cm³ of mercury = $156.50/2547.14 cm³

Price of 1 cm³ of mercury = $0.0614

d. Price of 1 in³ of mercury:

1 cm³ = 0.0610 in³

2547.14 cm³ = 2547.14 * 0.0610 in³

2547.14 cm³ = 157.02 in³

Price of 1 in³ of mercury = 156.5/157.02

Price of 1 in³ of mercury = $0.996

In conclusion, the prices of the different units of volume and mass of mercury are found by conversion.

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That is true he was known as the hair buyer

Answer:

its true.

i did it on edg 2020

In the given reaction of Sulfur dioxide and calcium carbonate, for complete reaction, 1.90 tons of sulfur dioxide would require 2.9 tons of Calcium carbonate.

Balancing a chemical equation follows the law of mass conservation. The quantity of an element in the product and in reactants should be the same. Balanced equation of the reaction:

2CaCO3 + 2SO2 + O2 → 2CaSO4 + 2CO2

Two moles of calcium carbonate react with two moles of sulfur dioxide and give two moles each of calcium sulfate and carbon dioxide.

One ton is equal to a thousand kilograms and one kilogram is equal to a thousand grams. Which means one ton is equal to 10^6 grams.

The moles of a compound are obtained using the following formula:

Moles = given mass in grams/ molar mass

Tons of SO2  = 1.90 tons

Molecular mass of SO2  = 64

Moles of SO2  = (1.90 x 10^6) /64 = 0.029 x 10^6  

Now, 0.029 x 10^6  moles of SO2 would completely react with 0.029 x 10^6 moles of CaCO3.

The molar mass of CaCO3 = 40+12+16+16+16 =100

Grams in 2.9 x 10^6  moles of CaCO3 = moles x molecular mass

Grams in 2.9 x 10^6  moles of CaCO3= 100 x  0.029 x 10^6

Grams in 2.9 x 10^6  moles of CaCO3 = 2.9 x 10^6

In conclusion, 1.90 tons of sulfur dioxide would require 2.9 tons of Calcium carbonate to react completely.

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Answer:

Chemical change results in one or more substances of entirely different composition from the original substances. The elements and/or compounds at the start of the reaction are rearranged into new product compounds or elements. A CHEMICAL CHANGE alters the composition of the original matter.

Explanation:

If there is a change in chemical properties, it indicates that a chemical reaction has occurred.

Chemical properties describe how a substance behaves when it undergoes a chemical change. These properties include reactivity, flammability, toxicity, and the ability to undergo chemical reactions.

When a chemical reaction takes place, the substances involved are transformed into new substances with different chemical properties. This can be observed through various changes such as color, odor, temperature, gas production, or the formation of a precipitate.

Thus, a change in chemical properties suggests that a chemical reaction has occurred, resulting in the formation of new substances with different properties.

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This is not the best way to organize a periodic table because two elements might have similar atomic mass.

Periodic table is a chart in which arrangement of chemical elements are done.

In the early periodic table elements are arranged on the basis of their atomic masses, while after sometime Moseley arranged the periodic table on the basis of atomic number as he proposed that properties of an element is justified on the basis of number if electrons.

And mass of two substances may be same so it is difficult to differentiate between them.

Hence, two elements might have similar atomic mass.

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A mixture of gases contains 12. 0 grams of n2 and 15. 0 grams of ar, under a total pressure of 1. 32 atm. What is the partial pressure of n2?.

The partial pressure of n2 in the mixture of above gases is 0.7atm.

What is partial pressure?

Each gas in a mixture of gases has a partial pressure, which is the pressure that would exist if that gas alone had filled the complete volume of the original mixture at the same temperature.

N=12.0, Ar=15.0

Total pressure=1.32

Partial pressure of n2=?

WN2=12.0

WAr =15.0

nN2=12/28 =0.42

nAr=15/40 =0.37

Xn2=0.42/0.42+0.37 =0.53

Pn=Xn2×Ptotal

=0.53×1.32=0.69atm that ie nearly equal to 0.7atm

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The term "partial pressure" refers to the amount of pressure that each gas in a mix exerts. A mole fraction of the a gas,x, can also be used to formulate Dalton's law.

The partial pressure formula: what is it?

Partial pressures can be calculated in one of two ways: 1) To determine the individual pressures of each gas in a mixture, use PV = nRT. 2) Determine the proportion of pressure from of the total pressure that may be assigned to each single gas by using the molar concentration of each gas.

What is the name for partial pressure?

The idea of partial pressure is derived from the fact so each individual gas contributes to the overall pressure in a given proportion, which corresponds to its partial pressure. In order to characterise all the pieces, it is essentially equivalent to taking a percent or proportion of the whole.

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The pH at the equivalence point is 8.72.

A mixture of a weak acid and its conjugate base is called a buffer solution. The acid-base reaction for the titration of a weak acid using a strong base is shown in the attached picture. The equivalence point is reached when there is enough base to neutralize the acid.

The number of moles of acetic acid can be calculated by multiplying molarity (0.10 M) and volume (50 mL or 0.05L), resulting in 5 x 10 -3 mol. This will also be equal to the moles of conjugate base produced.

For the next reaction, the concentration of the conjugate base must be determined by dividing its number of moles by the total volume. The calculation of the NaOH volume used is shown below.

molarity of NaOH = moles NaOH / volume NaOH

volume NaOH = 5 x 10-3 moles / 0.10 M

volume NaOH = 0.05 L

total volume = volume NaOH + volume acetic acid

total volume = 0.05 L + 0.05 L = 0.10 L

concentration of conjugate base CH3COO- = 5x 10-3 mol / 0.10 L = 0.05 M

Then, we will determine the value of x from the second reaction. The base dissociation constant or Kb is used to solve for x. The value of acid dissociation constant or Ka of acetic acid is 1.8x10-5.

Kw = 1 X 10 -14 = Ka * Kb

Kb = 1x10-14 / Ka = 1x10-14 / 1.8x10-5

Kb= 5.56 x 10-10

Kb = { [CH3COOH]*[OH-]} / [CH3COO-]

Use the equilibrium value from the second reaction to solve for x

\(5.56x10x^{-10}=\frac{[x][x]}{[0.05-x]}\)

\((5.56x10^{-10})(0.05)- (5.56x10^{-10})(x)=x^{2}\)

\(x^{2} +5.56x10^{-10}x-2.78x10^{-11}=0\)

Solving for x through the quadratic equation, x is found to be equal to 5.27x10-6. This is also equal to the concentration of -OH.

pOH = -log (5.27x10-6) = 5.27

pH = 14 - pOH = 8.72

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Answer:

The flash of green light may give off some type of energy that only emits from green light which probably energizes the Flubber

Explanation:

A flubber is a rubber like polymer that absorbs and amplifies energy. A flubber absorbs energy from a light source and electrons present in it are excited in order to emit light of higher wavelength. The green light absorbed by the flubber to emit longer wavelength of light emitting more energy.

The boiling point of water changes at different salt concentrations. To test the effect of salt concentration on the boiling point of water, an experimenter proposed an experiment involving four concentrations of salt. The concentrations included 0g, 32g, 64g, and 128g of salt per gallon of filtered tap water.

The experiment involves filling up a pot with one gallon of filtered tap water and adding a specific amount of salt to it. After stirring the water with a sterilized utensil until the salt is dissolved, the pot is placed on a stove top, and two thermometer probes are placed in the water.

The stove is turned on to its highest heat setting.The experimenter proposed that four pots be used simultaneously on the stove top to save time. Eight temperature probes are available, with two placed in each pot. Each pot is always placed on the same position of the stove and given the same amount of salt.

Therefore, we should be more skeptical of causal inferences made from this study because: The experiment is not randomized, and therefore, the study cannot be used to establish causal relationships. There may be confounding factors that affect the boiling point of water, such as the position of the pot on the stove.

The experiment does not control for the position of the pot on the stove, which may affect the temperature readings. The experiment uses a very small sample size. Therefore, the findings may not be generalizable to the population as a whole.

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The correct statement is "groups are vertical columns, while periods are horizontal rows".

The chemical elements are shown in tabular form on the periodic table, sometimes referred to as the periodic table containing the elements. It is frequently used in physics, chemistry, and some other sciences, and thus is frequently regarded as a symbol of chemistry.

The Periods were the horizontal rows of the periodic table. The periodic table contains seven distinct periods in all. They have the same amount of electron shells and thus are symbolized by the exact overall number of valence electron.

In a periodic table, the horizontal rows were known as periods, while the vertical columns were known as groups.

Therefore, the correct answer will be option (a).

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Answer:

groups are vertical columns, while periods are horizontal rows

Explanation:

Answer:

84

Explanation:

From the question given above, it is evident that 222 86Rn is emitting alpha particle since the daughter nuclei produced has a mass number lesser than 4 when compared to parent element.

Therefore, the miss value in the equation is 84.

Please see attachment for further details

Based on the calculations, the missing value that will balance the equation is: A. 84.

An alpha decay is a type of nuclear reaction in which the atomic nucleus of a radioactive element emits an alpha particle (helium atom), thereby, producing chemical elements with a different atomic nucleus.

In this exercise, we are given the following nuclear equation with an alpha decay:

²²²R₈₆   -----> ²¹⁸Poₓ + ⁴He₂

For the subscript, we have:

86 - 2 = 84.

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Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."

The 3-sigma control limits are used in statistical process control to determine the acceptable range of variation in a process. To calculate the 3-sigma control limits, we need to first find the mean and standard deviation of the service times for the 20 randomly selected customers.

Step 1: Find the mean (average) of the service times.
Add up all the service times and divide by the total number of customers (20).

Step 2: Find the standard deviation of the service times.
Calculate the difference between each service time and the mean, square each difference, sum up all the squared differences, divide by the total number of customers (20), and then take the square root of the result.

Step 3: Calculate the 3-sigma control limits.
Multiply the standard deviation by 3 and add/subtract the result to/from the mean. This will give you the upper and lower control limits.

Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."

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Answer:

q = mC∆T

m = mass = 25 ml CaCl2 + 25 ml KF = 50 ml x 1.00 g/ml = 50 g

C = 4.184 J/g-deg

∆T = 1.7 deg

q = (50 g)(4.184 J/g-deg)(1.7 deg) = 355.6 J

Looking at the chemical reaction: CaCl2(aq) + 2KF(aq) ==> CaF2(s) + 2KCl(aq)

moles CaCl2 present = 0.025 L x 1.00 mol/L = 0.025 mol CaCl2

moles KF = 0.025 L x 2.00 mol/L = 0.05 mol KF

Neither reactant is limiting as they are both present in stoichiometric quantities. Thus, moles CaF2 formed will be 0.025 moles CaF2 formed.

∆Hppt = 355.6 J/0.025 moles = 14,224 J/mole = 14.2 kJ/mole

The given statement "when insulin is being mixed, NPH insulin is always drawn up first" is TRUE because when mixing insulins, it is important to follow the correct procedure to ensure accurate dosing and avoid contamination.

NPH insulin, an intermediate-acting insulin, is always drawn up first before short-acting or rapid-acting insulin.

This process, also known as "clear to cloudy," ensures that the clear insulin does not contaminate the NPH insulin vial.

First, you should draw air into the syringe equivalent to the NPH insulin dose and inject it into the NPH vial. Then, draw air equivalent to the short-acting insulin dose and inject it into the clear insulin vial.

Finally, draw the clear insulin into the syringe, followed by the NPH insulin. This method maintains the integrity of both insulins and ensures proper dosing.

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Answer:

7.5%

Explanation:

Percent error is this formula: your answer - accepted value divided by accepted value x 100

1.075 g/mL - 1.00 g/mL = 0.075

Divide 0.075 by 1.00 g/mL = 0.075

Multiply 0.075 by 100 = 7.5

The percent of the error in Kayla's density measurement is 7.5%.

The given parameters;

The error in Kayla measurement is calculated as follows;

Error = measured value - known value

Error = 1.075 g/ml - 1 g/ml

Error = 0.075 g/ml

The percent of the error in Kayla's density measurement is calculated as;

\(Error \ percent = \frac{Error}{known \ value} \times 100\%\\\\Error \ percent = \frac{0.075}{1} \times 100\%\\\\Error \ percent = = 7.5\%\)

Thus, the percent of the error in Kayla's density measurement is 7.5%.

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Answer:

If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, ... If I contain 3.0 moles of gas in a container with a volume of 60. liters and at a ... Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ... volume of 5.00 Lat 25.0C. Calculate the partial pressure of each gas and the ...

Explanation:

The proton number has the highest value in the ion

In an atomic element Q, the mass number is the number of the proton and the neutron, the electron encircles around the nucleus of the atomic element.

Recall that:

∴

The atomic element Q+ has a positively charged ion, Thus, the proton number in the mass of the atomic element Q, therefore, has the highest value in the ion.

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The solubility of a gas in a liquid under different pressures can be calculated using Henry's Law.

The solubility of a gas in a liquid under different pressures can be calculated using Henry's Law, which describes the relationship between the pressure of a gas and its solubility in a liquid. According to Henry's Law, at a constant temperature, the solubility (S) of a gas in a liquid is directly proportional to the partial pressure (P) of the gas above the liquid.

Mathematically, Henry's Law is expressed as:

S = k * P

Where:

S = Solubility of the gas in the liquid (usually in mol/L or g/L)

k = Henry's Law constant, which is specific to the gas and the solvent at a given temperature (units depend on the units of pressure and solubility chosen)

P = Partial pressure of the gas above the liquid (usually in atm or kPa)

To calculate the solubility of a gas in a liquid under different pressures, you would typically perform the following steps:

Determine the Henry's Law constant (k) for the specific gas and solvent at the given temperature.

Measure or obtain the partial pressure (P) of the gas above the liquid at the desired pressure conditions.

Use the Henry's Law equation to calculate the solubility (S) of the gas in the liquid:

S = k * P

The solubility will be in units of mol/L (molarity) or g/L, depending on the units used for the Henry's Law constant and partial pressure.

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Answer:

mining of clay limestone and then heated to a certain temperature of 1450⁰ in a cement kiln

Answer:

Helium

Explanation:

The ionization energy decreases from top to bottom in groups, and increases from left to right across a period.

Answer:

downwelling also allows for deep ocean oxygenation to occur because these waters are able to bring dissolved oxygen down from the surface to help facilitate aerobic respiration in organisms throughout the water column

The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

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Two electrons are lost by Mg and gained by N

Electrons can be lost or gained in a chemical reaction. In fact, the process of gaining or losing electrons is central to many types of chemical reactions.

Chemical reactions involve the transfer of electrons between atoms or molecules, which can result in the formation of new compounds or the breakdown of existing ones. When an atom or molecule gains one or more electrons, it becomes negatively charged and is said to be reduced. Conversely, when an atom or molecule loses one or more electrons, it becomes positively charged and is said to be oxidized.

We can see that we can write this reaction as;

3Mg^0 + N2^0  ---->3Mg^+ + N^2-

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Answer:

neutral

Explanation: