Counting Atoms and Balancing Chemical Equations

Front

What is a coefficient?

Back

The large number to the left of a formula that indicates how many molecules of that substance are present.

Front

When balancing equations, what can be placed to the left of a formula of a substance to make the equations balanced?

Back

A coefficient.

Front

Is the equation H₂ + O₂ → H₂O balanced?

Back

No.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

How many Oxygens are in the molecule (OH)₂?

Back

2.

Tags

NGSS.MS-PS1-1

Front

How many O's are in Al₂(SO₄)₃?

Back

12.

Tags

NGSS.MS-PS1-1

Front

What is a subscript in a chemical formula?

Back

A small number written to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

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

Back

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

Tags

NGSS.MS-PS1-5

Front

What is the purpose of balancing chemical equations?

Back

To obey the law of conservation of mass, which states that matter cannot be created or destroyed.

Tags

NGSS.MS-PS1-5

Front

In the equation 2H₂ + O₂ → 2H₂O, what does the '2' in front of H₂O represent?

Back

It indicates that there are 2 molecules of water produced.

Tags

NGSS.MS-PS1-5

Front

What is the total number of atoms in the molecule C₆H₁₂O₆?

Back

24 (6 Carbon + 12 Hydrogen + 6 Oxygen).

Tags

NGSS.MS-PS1-1