A) How does a phase change from solid to liquid occur in a substance?

Question

(1 point)
Heat energy is released from the substance, strengthening the electrical
attraction between molecules.
Heat energy is added to the substance, weakening the electrical attraction
between molecules.
Heat energy is released from the substance, weakening the electrical attraction
between molecules.
Heat energy is added to the substance, strengthening the electrical attraction
between molecules.
A) How do weak intermolecular bond strengths affect the melting and boiling
point of a substance? (1 point)
The melting point is higher, but the boiling point is lower.
Both the melting point and boiling point are lower.
Both the melting point and boiling point are higher.
The melting point is lower, but the boiling point is higher.
12/6/24, 7:08 AM Vega Viewer SPA

A)
Which statement best describes what happens during hydrogen bonding?
Hint: Think about the formation of hydrochloric acid (HCl) as an example of a
compound with hydrogen bonding.
(1 point)
The electronegative hydrogen atom in one molecule and a partial negative
atom in another molecule experience attraction.
The partial positive hydrogen atom in one molecule and a partial positive atom
in another molecule experience attraction.
The partial negative hydrogen atom in one molecule and a partial positive atom
in another molecule experience attraction.
The partial positive hydrogen atom in one molecule and a partial negative atom
in another molecule experience attraction.
12/6/24, 7:08 AM Vega Viewer SPA

Question 5
A) Which term or phrase represents a separation of charges in a molecule,
resulting in partial positive and partial negative charges? (1 point)
ion
dipole
hydrogen bonding
phase change
A) Which statement explains why water and ethanol have different boiling
points? (1 point)
Water exhibits hydrogen bonding, while ethanol does not.
Water and ethanol have different melting points.
Water and ethanol have different molecular structures.
Water is liquid at room temperature, while ethanol is not

Answer 1

Let's address each question one by one:

Question 1

How does a phase change from solid to liquid occur in a substance?

• Correct answer: Heat energy is added to the substance, weakening the electrical attraction between molecules.

Question 2

How do weak intermolecular bond strengths affect the melting and boiling point of a substance?

• Correct answer: Both the melting point and boiling point are lower.

Question 3

Which statement best describes what happens during hydrogen bonding?

• Correct answer: The partial positive hydrogen atom in one molecule and a partial negative atom in another molecule experience attraction.

Question 4

Which term or phrase represents a separation of charges in a molecule, resulting in partial positive and partial negative charges?

• Correct answer: dipole

Question 5

Which statement explains why water and ethanol have different boiling points?

• Correct answer: Water exhibits hydrogen bonding, while ethanol does not.