Someone please asnwer all four

Thank You

Answer:

Explanation:

Hess’s law derives directly from the law of conservation of energy, as well as its expression in the first law of thermodynamics. By Hess’s law, the net change in enthalpy of the overall reaction is equal to the sum of the changes in enthalpy for each intermediate transformation: ΔH = ΔH1+ΔH2+ΔH3.

Answer:

The principal quantum number (n) describes the size of the orbital. Orbitals for which n = 2 are larger than those for which n = 1, for example.

Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

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Explanation:

First we have to balance this equation:

__ AgNO₃ (aq) + __ H₂SO₄ (aq) ---> __ Ag₂SO₄ (s) + __ HNO₃ (aq)

If we look at the equation we can see that we have two atoms of Ag on the right side of the equation and just one atom of Ag on the left side. So we can change the coefficient for AgNO₃ and write a 2 there.

Also, we have 2 atoms of H on the left side of the equation and just one on the right side, so we can change the coefficient for HNO₃ and write a 2 there. The balanced equation is:

2 AgNO₃ (aq) + H₂SO₄ (aq) ---> Ag₂SO₄ (s) + 2 HNO₃ (aq)

Now, 48.7 g of AgNO₃ will react with 28.6 g of H₂SO₄. We have to determine the limiting reagent. To do that we can find the number of moles of Ag₂SO₄ produced by those grams.

First we can convert those masses into moles using their molar masses.

molar mass of Ag = 107.87 g/mol

molar mass of N = 14.01 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of S = 32.07 g/mol

molar mass of AgNO₃ = 107.87 g/mol + 14.01 g/mol + 3 * 16.00 g/mol

molar mass of AgNO₃ = 169.88 g/mol

molar mass of H₂SO₄ = 2 * 1.01 g/mol + 32.07 g/mol + 4 * 16.00 g/mol

molar mass of H₂SO₄ = 98.09 g/mol

mass of AgNO₃ = 48.7 g

mass of H₂SO₄ = 28.6 g

moles of AgNO₃ = 48.7 g * 1 mol/(169.88 g)

moles of AgNO₃ = 0.287 moles

moles of H₂SO₄ = 28.6 g * 1 mol/(98.09 g)

moles of H₂SO₄ = 0.292 moles

2 AgNO₃ (aq) + H₂SO₄ (aq) ---> Ag₂SO₄ (s) + 2 HNO₃ (aq)

We have to determine the limiting reactant of this reaction. We mixed 0.287 moles of AgNO₃ with 0.292 moles of H₂SO₄. We can find the number of moles of Ag₂SO₄ produced by each reactant with an excess of the other one.

According to the coefficients of the reaction the molar ratio between AgNO₃ and Ag₂SO₄ is 2 to 1.

2 moles of AgNO₃ = 1 mol of Ag₂SO₄

moles of Ag₂SO₄ = 0.287 moles of AgNO₃ * 1 mol of Ag₂SO₄/(2 moles of AgNO₃)

moles of Ag₂SO₄ = 0.144 moles

According to the coefficients of the reaction the molar ratio between H₂SO₄ and Ag₂SO₄ is 1 to 1.

1 mol of H₂SO₄ = 1 mol of Ag₂SO₄

moles of Ag₂SO₄ = 0.292 moles of H₂SO₄ * 1 mol of Ag₂SO₄/(1 mol of H₂SO₄)

moles of Ag₂SO₄ = 0.292 moles

So, 0.287 moles of AgNO₃ (when reacting with enough H₂SO₄) will produce 0.144 moles of Ag₂SO₄. And 0.292 moles of H₂SO₄ (when reacting with enough AgNO₃) will produce 0.292 moles of Ag₂SO₄. So, AgNO₃ is limiting our reaction and H₂SO₄ is in excess.

We found that 0.144 moles of Ag₂SO₄ are produced and finally we can convert that into moles using the molar mass of Ag₂SO₄.

molar mass of Ag = 107.87 g/mol

molar mass of O = 16.00 g/mol

molar mass of S = 32.07 g/mol

molar mass of Ag₂SO₄ = 2 * 107.87 g/mol + 32.07 g/mol + 4 * 16.00 g/mol

molar mass of Ag₂SO₄ = 311.81 g/mol

mass of Ag₂SO₄ = 0.144 moles * 311.81 g/mol

mass of Ag₂SO₄ = 44.9 g

Answer: The mass of Ag₂SO₄ that could be formed is 44.9 g.

The complementary strand is: CCA - AAA - ACC - CAC - TGG - TTT

DNA transcription is the process by which information stored in DNA is passed to a protein through RNA. Then the process occurs in which the information from the DNA is passed to the RNA using the enzyme RNA polymerase which will form an mRNA that will be faithful to the information found in the DNA and through this mRNA the protein will be formed thanks to ribosomes.

RNA polymerase is then the enzyme that will form the mRNA from a DNA strand that will be the template.

Therefore, we can confirm that the complementary strand is: CCA - AAA - ACC - CAC - TGG - TTT

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According to the molecular geometry, with the help of structure of molecules which provide information on site of attachment with other molecules, one can determine their mode of reaction.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

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Answer: The shape of a molecule helps to determine its properties, which affect how a molecule interacts with other molecules, such as polarity and bonding.

There are two characteristics of molecules, one is geometry and other is shape. Shape is excluding lone pair surrounding the central element and geometry is including the lone pair. Therefore, the angles can be found out by VSEPR theory.

VSEPR stands for valence shell electron pair repulsions. VSEPR theory is used to predict the shape and geometry of molecules on the basis of valence electrons pairs that are present around the central element of the molecule.

According to VSEPR theory, Lone pair lone pair repulsion is greater than bond pair bond pair repulsion. There are so many limitations of VSEPR theory. There is a repulsion between bond pair electrons and lone pairs present on the central element.

Angle A:120 since lone pair is in conjugation with the ring so sp² hybridized.

Angle B:120, sp² hybridized

Angle C:180, sp hybridized

Angle D:109.5 sp³ hybridized

Angle E:120, sp² hybridized

Therefore, the angles can be found out by VSEPR theory.

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Answer:

pickles are ligit good

Explanation:

i like pickles but not his

Answer:

no.3 is your correct answer

According to the given statement Summer are usually hot and dry represent climate.

Climate is the usual weather observed over a longer period of time in a certain location. A description of a climate includes specifics like the average temperature in each season, how much rain falls, and how much sun there is. Additionally, descriptions of the extreme are common.

Nearly every area of our life is impacted by the climate, including our food supplies, transport networks, clothing choices, and vacation destinations. It significantly affects our future, our wellbeing, and our means of subsistence. The long-term pattern of the climate in any given location is called the climate.

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Answer:

D)

Explanation:

A tendon is a fibrous connective tissue that attaches muscle to bone. Tendons may also attach muscles to structures such as the eyeball

Answer:

yes, they were

Explanation:

The history of the metric system began in the Age of Enlightenment with notions of length and weighttaken from natural ones, and decimal multiples and fractions of them. The system became the standard of France and Europe in half a century. Other dimensions with unity ratios[Note 1] were added, and it went on to be adopted by the world.

The partial pressure of the nitrogen gas from the calculation is 4.94 kPa

When all other gases in a mixture are held constant, a gas's partial pressure is the pressure it exerts on its own. It is calculated by dividing the total pressure of the gas mixture by the percentage of the mixture's total volume occupied by the specific gas.

Partial pressure of nitrogen = Total pressure - (Partial pressure of carbon dioxide + Partial pressure of oxygen + Partial pressure of other gases)

= 101.3 - (21.22 + 75.1 + 0.04)

= 4.94 kPa

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According to the given reaction, 2 moles of As react with 6 moles of NaOH. Use this ratio to find how many moles of NaOH react with 492 moles of As.

It means that you need 1476 moles of NaOH to use 492 moles of As all up.

Answer:

You would see whatever liquid you added slowly disappearing

Explanation:

Hope this helps:)........if not then sorry for wasting your time and may God bless you:)

Answer:

If you take a clear cup of water and put a camera to watch it, If you time lapsed it, you would see the water slowly evaporate.

Explanation:

Hope this helped :)

Answer:

0.75

Explanation:

3/4=0.75 so therefore its 0.75

0.25 mL of the stock solution would be taken using a serological pipet and mixed with 49.75 mL of water in the measuring cylinder.

In order to prepare 50 mL, 0.05 M HCl from 10M stock, the volume of the stock that would be needed first needs to be calculated using the dilution equation:

                         M1V1 = M2V2

In this case, V1 is what we are looking for:

                     10V1 = 0.05 x 50

                         v1 = 0.25 mL

Thus, 0.25 mL of the stock is needed.

Hence, the solution can be prepared by measuring 49.75 mL of distilled water into the 100 mL cylinder and then using the 10 mL serological pipet to take 0.25 mL from the stock solution into the measured distilled water in the cylinder to make the 50 mL mark.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question we have

\(density = \frac{24}{2.7} \\ = 8.88888...\)

We have the final answer as

Hope this helps you

Answer:

C. cell --> tissue --> organ --> organ system --> organism

Explanation:

Cells are the building blocks of life (Ex: skin cells)

A group of cells for a tissue (Ex: epithelial tissue)

Tissues working together form an organ (Ex: the stomach)

Organs working together create organ systems (Ex: the digestive system)

Organ systems create organisms (Ex: a human)

Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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Answer:

Observation is the active acquisition of information from a primary source. In living beings, observation employs the senses. In science, observation can also involve the recording of data via the use of scientific instruments. The term may also refer to any data collected during the scientific activity.

Explanation:

26.62 grams of HBr would be present in 355 mL of a 7.5% m/v HBr solution.

Concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution.

There are various methods of expressing the concentration of a solution.

Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.

Solutions of known concentration can be prepared either by dissolving a known mass of solute in a solvent and diluting to a desired final volume or by diluting the appropriate volume of a more concentrated solution (a stock solution) to the desired final volume.

Given,

HBr = 7.5% m/ v

This means 7.5g of HBr in 100 ml of the solution.

1 ml of the solution has 0.075g

355 ml of the solution will have = 0.075 × 355 = 26.62g of HBr

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Answer:

I)Acetylene

II)2-Methyl-1-butanol

Explanation:

I)appears as a colorless gas with a faint garlic-like odor. Easily ignited and burns with a sooty flame. Gas is lighter than air.

Answer:

It means that elements' chemical and physical properties reoccur periodically if the elements are arranged according to their atomic weights. Atomic weight is also known as relative atomic mass