Counting Atoms Review

Front

How many Magnesium (Mg) atoms are in 10 MgCl₂?

Back

10

Front

What does the coefficient represent in a chemical formula?

Back

The number of molecules

Front

Which is the correct formula for two hydrogen (H) and one oxygen (O)?

Back

H₂O

Front

What does the subscript represent in a chemical formula?

Back

The number of atoms in a molecule

Front

How many Hydrogen (H) atoms are in 4 H₂O?

Back

8

Front

What is the chemical formula for water?

Back

H₂O

Front

How many total atoms are in 2 H₂O molecules?

Back

6

Front

What is the coefficient in the formula 3 NaCl?

Back

3 (indicating 3 molecules of NaCl)

Front

How many oxygen atoms are in 2 H₂O?

Back

2

Front

What does a subscript of '2' next to an element symbol indicate?

Back

There are 2 atoms of that element in the molecule.