How does a phase change from solid to liquid occur in a substance? (1 point) Heat energy is added to the substance, weakening the electrical attraction between molecules.

Heat energy is released from the substance, strengthening the electrical attraction between molecules.

Heat energy is added to the substance, strengthening the electrical attraction between molecules.

Heat energy is released from the substance, weakening the electrical attraction between molecules.

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 higher.

The melting point is lower, but the boiling point is higher.

Both the melting point and boiling point are lower

Which statement describes the hydrogen and oxygen atoms in water? (1 point)

The lone pair of electrons in each hydrogen atom causes the molecule to be bent; the oxygen atom has a partial positive charge, while the hydrogen atoms have partial negative charges.

The lone pair of electrons in each hydrogen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.

The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.

The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial positive charge, while the hydrogen atoms have partial negative charges

On a heating curve, what do the plateaus represent? (1 point)

energy remaining constant.

increasing temperature

phase change

increasing kinetic energy

At what point on a heating curve graph does a phase change occur? (1 point)

at each plateau

at each slope

at the first plateau

at the last slope