Connect Properties to Particles Practice Test

Vinegar is mixed with baking soda in a cup. Macroscopic level: bubbles form, the mixture fizzes, and the cup feels cooler. Particle level: particles before mixing are vinegar molecules and baking soda particles; after mixing, different particles are present.

Which particle-level statement best explains the bubbling?

A sealed plastic syringe contains a gas. When the plunger is pushed in, the gas takes up less volume. Macroscopic level: the gas is compressed and the pressure increases. Particle level: gas particles are far apart and move freely.

Which particle-level change best explains why the gas can be compressed?