Question

d. flammability is a chemical property
reading check

1. explain: how does a material change at its melting point and at its boiling point?

material changes from solid to liquid at the boiling point
visual check

1. identify: what type of chemical property is shown in the figure below?

Explanation:

At the melting - point, a material changes from a solid to a liquid as heat energy is absorbed to break the intermolecular forces holding it in a solid state. At the boiling - point, the material changes from a liquid to a gas as more heat energy is absorbed to completely separate the molecules. The figure of a burning object shows the chemical property of flammability, which is the ability of a substance to burn in the presence of oxygen.

Answer:

1. At the melting point, a material changes from solid to liquid. At the boiling point, it changes from liquid to gas.
2. Flammability.