Counting Atoms

What is the small number after an element in a chemical equation called.

Example: H₂

• Coefficient

• Subscript

• Atom

• Equation

What number represents the coefficient in 3 H₂O ?

• 6

• 5

• 2

• 3

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient
• Product
• Yield
• Subscript

This is the BIG number that appears in front of a chemical formula, and represents how many molecules there are.

• An Atom

• The Subscript

• A Molecule

• The Coefficient

How many Iron (Fe) and Oxygen (O) are there?

• Fe = 1, O = 2

• Fe = 2, O = 3

• Fe = 2, O = 1

• Fe = 1, O = 3

How many carbon atoms and oxygen atoms are there in "5 CO₂" ?

• C = 1, O = 2

• C = 5, O = 10

• C = 1, O = 10

• C = 5, O = 2

How many sodium atoms are in 6 NaCl?

• 1
• 12
• 6
• none

• 7

• 6

• 3

• 4

• 6

• 1

• 12

• 24

• Iron, Oxygen

• Francium, Europium, Oxygen

• Ferrium, Oxygen

• Berylium, Oxygen