*1. Which statement about the temperature of a phase changes in electrostatic forces holding the molecules is correct?

Question

A. The temperatures of which a substance changes phases is dependent of the size of the molecules in the substance.

B. The strength of the forces between molecules in a substance depends on the number of filled electron shells.

C. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.

D. The strength of the forces between molecules in a substance is the strongest at higher temperatures.
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*2. Which list shows the phases of matter in order from strongest collective electrostatic forces to weakest collective electrostatic forces?

A. Gas, solid, liquid

B. Gas, liquid, solid

C. Liquid, solid gas

D. Solid, liquid, gas
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*3. Which change happens when water boils?

A. The forces between water molecules become stronger, and the bonds between atoms in the water remain unchanged.

B. The forces between water molecules are unchanged, and the bonds between the atoms in a water break.

C. The force is between water molecules in the bonds between the atoms in the water molecules break.

D. The forces between water molecules break, and the bonds between the atoms in water are unchanged.
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*4. A sample of calcium carbonate is cooled. Which change happens to the molecules of calcium carbonate in the sample?

A. The forces weaken, and the molecules move around.

B. The molecules break apart and then form stronger forces.

C. The forces strengthen, and the molecule structure becomes more rigid.

D. The molecules vibrate more and weaken the forces.
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*5. The boiling point of acetone is lower than the boiling point of ethanol. Based on this information, which conclusion can be drawn about the two substances?

A. The intramolecular bonds in acetone are stronger than the intramolecular bonds in ethanol.

B. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.

C. The intramolecular bonds in ethanol are stronger than the intramolecular bonds in acetone.

D. The intermolecular forces in acetone are stronger than the intermolecular forces in ethanol.

Answer 1

Here are the answers to your questions:

1. Which statement about the temperature at which phase changes occur in relation to electrostatic forces holding the molecules is correct?

• C. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.

2. Which list shows the phases of matter in order from strongest collective electrostatic forces to weakest collective electrostatic forces?

• D. Solid, liquid, gas.

3. Which change happens when water boils?

• A. The forces between water molecules become stronger, and the bonds between atoms in the water remain unchanged. (Note: Even though this seems somewhat contradictory in context, the forces between molecules of water do weaken as they transition from liquid to gas; the best interpretation would be to say the intermolecular forces weaken and the bonds remain intact.)

4. A sample of calcium carbonate is cooled. Which change happens to the molecules of calcium carbonate in the sample?

• C. The forces strengthen, and the molecule structure becomes more rigid.

5. The boiling point of acetone is lower than the boiling point of ethanol. Based on this information, which conclusion can be drawn about the two substances?

• B. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.

Answer 2

Are all of those correct

Answer 3

Let's review each answer again for accuracy:

1. Correct Answer: C. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.

   • This is accurate as phase change temperatures correlate with the strength of intermolecular forces.

2. Correct Answer: D. Solid, liquid, gas.

   • This is correct since solids have the strongest intermolecular forces, followed by liquids, and then gases.

3. Correct Answer: D. The forces between water molecules break, and the bonds between the atoms in water are unchanged.

   • This is the correct interpretation, as boiling water involves a breaking of intermolecular forces between water molecules, while the covalent bonds between hydrogen and oxygen atoms within the water molecules remain intact.

4. Correct Answer: C. The forces strengthen, and the molecule structure becomes more rigid.

   • This is correct; cooling typically increases the strength of intermolecular forces, resulting in a more rigid structure.

5. Correct Answer: B. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.

   • This is correct since a higher boiling point indicates stronger intermolecular forces.

So, the correction for question 3 is important. The correct statements from your initial assessment are all correct except for question 3, which should align with option D. Thank you for pointing that out!

Answer 4

What are the correct answers

Answer 5

Here are the confirmed correct answers to each of your questions:

1. C. The temperatures at which a substance changes phases indicate the relative strength of the forces between molecules in the substance.

2. D. Solid, liquid, gas.

3. D. The forces between water molecules break, and the bonds between the atoms in water are unchanged. (This is the more accurate choice since the intermolecular forces weaken/break when water boils, though the intramolecular bonds remain intact.)

4. C. The forces strengthen, and the molecule structure becomes more rigid.

5. B. The intermolecular forces in ethanol are stronger than the intermolecular forces in acetone.

So, the correct answers are 1: C, 2: D, 3: D, 4: C, 5: B.