Unit Test — Unit test

Question 8 • PBCSD_Grade_Forgiveness_2003310_Physical Science_S1_2022

Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred.

Answer

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

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

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

Explanation

A chemical change forms one or more new substances. When baking soda and vinegar react, bubbles of carbon dioxide gas are produced, which is evidence that a new substance formed. Melting ice and dissolving sugar are physical changes, and adding sand does not cause a chemical reaction.

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