Properties of Matter — Test

Question 15 • Physical Science

Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred. If his conclusion is correct, which substances could he have been observing and why?

Answer

sand mixed into water, because when sand was added the mass of the beaker increased

sugar mixed into hot water, because the disappearance of solid indicates that the chemical identity of the sugar changed

ice mixed into warm oil, because the change of state that occurred when the ice melted cannot be reversed

baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed

Explanation

Baking soda and vinegar can react to produce carbon dioxide gas, seen as bubbles, along with other new substances. The formation of a new substance is evidence of a chemical change. In the other choices, sand mixing with water, ice melting, and sugar dissolving are physical changes; the substances’ chemical identities do not change.

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