7.1 Counting Atoms

Front

What is the chemical formula for water?

Back

H₂O

Front

How many atoms of hydrogen are in one molecule of water (H₂O)?

Back

2

Front

What is the total number of hydrogen atoms in 4H₂O?

Back

8

Front

What is the chemical formula for magnesium chloride?

Back

MgCl₂

Front

How many magnesium atoms are in 3MgCl₂?

Back

3

Front

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

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Front

Is the equation 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O balanced?

Back

Yes

Front

What does the arrow in a chemical equation represent?

Back

Yields

Front

What is the chemical equation for the combustion of ethanol (C₂H₅OH)?

Back

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

Front

Is the reaction 2CH₃OH + 3O₂ → 2CO₂ + 4H₂O balanced?

Back

Yes