Chemical Reactions Retake Test

Front

How many atoms of nitrogen (N) are in the equation: 2Co(NO₃)₂?

Back

4

Front

What is the definition of an independent variable?

Back

The variable that we change on purpose.

Front

Balance the chemical equation: ___ Al + ___ O₂ -> ___ Al₂O₃

Back

4,3,2

Front

What is NOT an example of a physical change?

Back

A piece of paper catching fire and turning into ash.

Front

How many oxygen atoms are in the chemical formula: 3Fe₂O₄?

Back

12

Front

What is a chemical reaction?

Back

A process where substances (reactants) transform into new substances (products).

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

The substances formed as a result of a chemical reaction.

Front

What is a physical change?

Back

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