Chemistry, 29.11.2021 02:10 stephaniero6

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

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