Chemical changes occur when a new substance is formed. Which of the following is a physical change and not a chemical change?

Baking soda reacting with vinegar

Helium is a very light gas that can be used to inflate ballons and give them lift. Hydrogen is a gas that is also lighter than air. Why is Hydrogen not used to inflate balloons?

Hydrogen is a purple gas and can stain objects that it comes in contact with.

It is too light, one small balloon filled with helium is enough to lift a car off the ground

Which statement is correct for pure substances?

The substance cannot be split up easily.

The substance must be an element.

The ingredients can be separated.

The substance must be a compound.

Basic Chemistry Quiz: How Well Do You Know Your Chemistry?

Chemistry

Reviewed by Janyce Wowk

Janyce Wowk, BS (Chemistry) |

Chemistry

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Janyce Wowk is a chemistry professional with a B.S. in Chemistry from Montclair State University. Her experience as a research assistant and lab technician in a PFAS laboratory has allowed her to develop strong laboratory, data analysis, and research skills.

, BS (Chemistry)

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| Attempts: 2,453 | Questions: 10 | Updated: Jun 19, 2026