CFAa

Front

What is the chemical formula for water?

Back

H₂O

Front

What do 2H₂ + O₂ → 2H₂O represent?

Back

A chemical reaction where 2 molecules of hydrogen gas combine with 1 molecule of oxygen gas to form 2 molecules of water.

Front

How many molecules are in 2H₂O?

Back

2

Front

What is a molecule?

Back

A molecule is a group of atoms bonded together.

Front

What is the process of combining hydrogen and oxygen to make water called?

Back

A chemical reaction.

Front

What is the ratio of hydrogen to oxygen in the formation of water?

Back

2:1

Front

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

Back

3 atoms (2 hydrogen and 1 oxygen).

Front

What is the significance of the coefficients in a chemical equation?

Back

They indicate the number of molecules involved in the reaction.

Front

What does the '2' in 2H₂O mean?

Back

It means there are 2 molecules of water.

Front

If you have 4H₂O, how many hydrogen atoms do you have?

Back

8 hydrogen atoms (4 molecules x 2 hydrogen each).