Law of conservation of mass

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed.

Front

In a reaction A + B --> C, if reactant A has 5g and product C has 9g, how many grams does reactant B have?

Back

4g

Front

What does the number to the lower side of an element represent?

Back

Subscript

Front

What does the Coefficient (3) in the Chemical Formula, 3H2O, tell you?

Back

It tells you how many molecules of water there are.

Front

How many oxygen atoms are in the chemical formula 2H2O?

Back

2 oxygen atoms.

Front

What is a chemical reaction?

Back

A process where reactants are transformed into products.

Front

What is a reactant?

Back

A substance that undergoes change in a chemical reaction.

Front

What is a product?

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 does not alter the chemical composition, while a chemical change does.

Front

What is a coefficient in a chemical equation?

Back

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