Physical Properties

Question 9 • GA-GSE Physical Science A

Which statement best compares and contrasts two physical properties of matter?

Answer

Density and solubility are similar because they both involve water, but they are different because density involves dissolving a material and solubility involves floating or sinking a material.

Density and solubility are similar because they both involve a material’s mass and volume, but they are different because density involves floating materials and solubility involves sinking materials.

Boiling points and melting points are similar because they both involve changing the heat of a material, but they are different because boiling point involves adding heat to a material and melting point involves removing heat from a material.

Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.

Explanation

Boiling point and melting point both describe temperatures at which matter changes state. At its boiling point, a liquid changes into a gas; at its melting point, a solid changes into a liquid. Choice D gives both the shared feature and the correct difference. The other choices confuse density, which is mass per unit volume, with floating or sinking, and solubility, which describes how much of a substance dissolves.

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