DB Mid-term Exam part 1

Front

A force is a __________ or __________ acting on an object.

Back

push, pull

Front

Which of the following is a physical change?

Back

Aluminum metal is pounded into sheets.

Front

Which of the following provides the best evidence that a chemical change is taking place?

Back

A flame burns on the surface of a solid.

Front

All chemical reactions create new substances. True or False?

Back

True

Front

The chemical formula for Baking Soda is NaHCO₃. How many elements make baking soda?

Back

4

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

Give an example of a chemical change.

Back

Iron rusting when exposed to oxygen and moisture.

Front

What is the definition of a reactant?

Back

A substance that takes part in and undergoes change during a reaction.

Front

What is the definition of a product in a chemical reaction?

Back

A substance that is formed as the result of a chemical reaction.