Stemscope Review: Conservation of Mass

Front

What does a chemical equation tell us?

Back

A chemical equation tells us the reactants and the products, the elements that make up the reactants and the products, and the number of atoms that make up the reactants and the products. (All of the above)

Front

How many Hydrogen (H) atoms are in 4NH₃?

Back

12

Front

How many Nitrogen (N) atoms are in 4NH₃?

Back

4

Front

How many elements does PbNO₃ have?

Back

3

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant in a chemical equation?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical equation?

Back

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

Front

How do you determine the number of atoms in a compound?

Back

You determine the number of atoms by multiplying the subscript of each element by the coefficient in front of the compound.

Front

What is the coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or atoms of that substance are involved in the reaction.

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.