Counting Atoms, Classifying and Balancing Equations

Front

What is the definition of a coefficient in a chemical equation?

Back

The large number to the left of a formula that indicates how many molecules or atoms are involved in the reaction.

Front

Is the equation Al + O2 --> 2Al2O3 balanced?

Back

NO!

Front

How many atoms of Magnesium are in 10MgCl2?

Back

10

Front

What does it mean for a chemical equation to be balanced?

Back

It means that the number of atoms for each element is the same on both sides of the equation.

Front

Is the equation Fe + S --> FeS balanced or unbalanced?

Back

Balanced

Front

Fill in the blanks with coefficients: PCl5 + _ H2O → _ HCl + H3PO4

Back

4, 5

Front

What is the purpose of balancing chemical equations?

Back

To ensure the law of conservation of mass is followed, meaning matter is neither created nor destroyed.

Front

What is the small number on the right of a chemical symbol called?

Back

Subscript.

Front

How do you determine if a chemical equation is balanced?

Back

Count the number of atoms of each element on both sides of the equation.

Front

What is the balanced equation for the combustion of propane (C3H8)?

Back

C3H8 + 5O2 --> 3CO2 + 4H2O