Chemistry Unit Test

Front

What happens to atoms in a chemical reaction?

Back

They rearrange and recombine to form new substances.

Front

What is the mass of the product when 24g of sulfur and 35g of iron react completely?

Back

59g

Front

What is the atomic number of an element that has 7 protons?

Back

7

Front

Which of the following is a chemical property? Cooking, Changing shape, Melting, Dissolving?

Back

Cooking.

Front

What element is represented by the atomic model shown? Carbon, Sulfur, Nitrogen, Oxygen?

Back

Oxygen.

Front

What is the definition of a chemical reaction?

Back

A process where substances (reactants) transform into new substances (products) through the rearrangement of atoms.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it remains constant.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

A substance formed when two or more elements chemically bond together.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.