Chemical Reactions assessment

Front

What does the number 3 represent in 4NH3?

Back

Subscript

Front

Which of the following shows signs of a chemical reaction? a red liquid and an orange solid are mixed to produce a gas and a green liquid. liquid water is taken to its freezing point and ice is formed. large trees are cut into logs to make firewood. water is added to a dark green liquid to produce a light green liquid.

Back

a red liquid and an orange solid are mixed to produce a gas and a green liquid.

Front

How would you describe this chemical formula? 3 H2O

Back

3 H2O molecules

Front

How many elements are in C6H12O6?

Back

3

Front

The Law of Conservation of Mass says that matter can neither be __________ or __________.

Back

created; destroyed

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products).

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

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

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.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules or atoms are involved.