Balancing Chemical Equations

Front

What is the Law of Conservation of Matter?

Back

A law stating that atoms are not created or destroyed during a chemical reaction.

Front

How many HCl molecules are needed to balance the equation: Mg + __HCl → MgCl2 + H2?

Back

2

Front

Does the equation 3 H2 + N2 → 2 NH3 follow the Law of Conservation of Mass?

Back

Yes, it is following the Law.

Front

What coefficients balance the equation: __Ag2O → __Ag + __O2?

Back

2, 4, 1

Front

If 40 grams of calcium reacts with 71 grams of chlorine, how much calcium chloride is produced?

Back

111 grams.

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

Front

What are reactants in a chemical reaction?

Back

The starting materials that undergo change during a chemical reaction.

Front

What are products in a chemical reaction?

Back

The new substances formed as a result of a chemical reaction.

Front

What does it mean to balance a chemical equation?

Back

To ensure that the number of atoms for each element is the same on both sides of the equation.

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 involved.