CHEMISTRY HIGH SCHOOL

Decreasing the temperature can change water vapor into liquid water. What other change might also accomplish this task?A. Increasing the temperature
B. Decreasing the pressure
C. Increasing the pressure

Answers

Answer 1

Answer:

Answer;

Increasing the pressure

Explanation;

An increase in pressure on a gas can bring the molecules close enough to each other to develop some inter-molecular attractions and form a liquid.
The increase in pressure changes the state of matter from gas to liquid and also from liquid to solid. But increase in pressure alone cannot change the state of matter. Every gases and liquid have certain temperature above which the application of pressure would not change the state of matter.

Answer 2

Answer: Decreasing the temperature can decrease the pressire. Temperature is directly proportional to pressure as what the law that Gay-Lussac stated. As the pressure goes increases,the temperature also increases. The higher the energy of a molecule, there is a high temperature and pressure also.

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Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand.

a sample of copper wire with a mass of 1.659 g is heated with excess powdered sulfur until the copper has combined with the sulfur, and all the extra sulfur has been burned off. The final product (a sulfide of copper ) has a mass of 2.080 g. Calculate the empirical formula of the product, and name it.

Answers

Copper mass = 1.659
Copper moles = 1.659 / 64 = 0.0259

Sulfur mass = 2.08 - 1.659 = 0.421
Sulfur moles = 0.421 / 32 = 0.0131

Ratio Copper : Sulfur = 2 : 1

Empirical formula: Cu ₂ S
Name: Copper (I) sulfide

Which type of bond results when one or more valence electrons are transferred from one atom to another?(1) a hydrogen bond
(2) an ionic bond
(3) a nonpolar covalent bond
(4) a polar covalent bond

Answers

To solve this we must be knowing each and every concept related to an ionic bond. Therefore, the correct option is option 2 among all the given options.

What is an ionic bond?

Ionic bond, also known as electrovalent bond, is a kind of connection generated in a chemical molecule by the electrostatic attraction of oppositely charged ions.

Whenever the valence (outer portion) electrons with one atom are permanently transferred to another, a bond is formed.

The atom that loses electrons has become a positive ion (cation), whereas the atom that obtains electrons is becoming a negatively charged ion (cation) (anion). When one or more valence electrons are transferred from one atom to another, then the bond formed is an ionic bond.

Therefore, the correct option is option 2 among all the given options.

To know more about an ionic bond, here:

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The type of bond that results when one or more valence electrons are transferred from one atom to another is the ionic bond. The answer is number 2. The rest of the choices do not answer the question above.

When converting an acid salt dissolved in water to its acid form, you are instructed to adjust the pH well into the acidic range (pH = ~2). Why don’t you just take the pH to neutral? You do the same for adjusting the pH of a solution containing an amine salt taking it well into the basic range rather than neutral. Why are you instructed to do this?

Answers

Answer:

The answer lays in logD.

Explanation:

So when you end up with neutral pH amine or either carboxylic acid can still be in a salt form. So for every compound the pH level of unionized form is different and for the best extraction experience is better to perform and extraction at as low as possible pH for acids and for amines as high as possible.

How do hydrogen bonds between water molecules occur?

Answers

Hydrogen bonds between water molecules occur because of the polarity of the water molecule.

A hydrogen bond is a weak bond that forms between a hydrogen atom that is covalently bonded to a highly electronegative atom and another highly electronegative atom in the same or a different molecule.

A water molecule consists of two hydrogen atoms and one oxygen atom. The hydrogen atoms are bonded to the oxygen atom, but the electrons in the covalent bonds are not shared equally. This results in a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms.

When two water molecules are close together, the partial positive charge on one hydrogen atom is attracted to the partial negative charge on the oxygen atom of the other molecule. This attraction is called a hydrogen bond.

Therefore, due to polarity of the water molecule, it results into hydrogen bonds between water molecules.

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Hydrogen bonds between water molecules occur through the attraction of hydrogen atoms and oxygen atoms of water molecules. For example, one water molecule's hydrogen atom will bond with the oxygen atom of another water molecule.

Calculate the decrease in temperarure when 2.00 L at 20.0 degrees celsius is compressed to 1.00 L.

Answers

I suspect that the pressure of this change is constant therefore

The equation is used from the combined gas law. (When pressure is constant both P's will cancel out P/P = 1)
V/T = V/T
Initial Change

Initially we have 2L at 20 degress what temperature will be at 1L.

2/20 = 1/T
0.1 = 1/T
0.1T = 1
T = 1/0.1
T = 10 degress celsius.

Hope this helps if you won't be able to understand what is the combined gas law just tell me :).

Final answer:

Using Charles's law, the calculation indicates a decrease in temperature by about 146.58 degrees Celsius when a 2.00 L volume of gas at 20.0 degrees celsius is compressed to 1.00 L.

Explanation:

To calculate the decrease in temperature due to compression, we can utilize Charles's Law, provided we are ignoring any changes in pressure. Initially, we have a volume (V₁) of 2.00 L at a temperature (T₁) of 20.0 degrees celsius which is equivalent to 293.15 K (converting to Kelvin). The volume is then compressed to 1.00 L (V₂) and we need to find the new temperature (T₂).

According to Charles' Law (V₁/T₁ = V₂/T₂), after we input the values from the problem, we can isolate T₂, resulting in following equation: T₂ = (V₂* T₁)/ V₁. Substituting the given values, we get T₂ = (1.00L*293.15 K)/2.00 L = 146.57 K.

However, we want to find the decrease in temperature in celsius. Difference in temperature in Celsius and Kelvin scales are the same. So, the decrease in temperature (ΔT) = T₁ - T₂ = 20.0°C - (-126.58°C) = 146.58°C. So, when the volume of the gas is compressed from 2.00 L to 1.00 L, the temperature decreases by about 146.58 degrees Celsius.