Counting Atoms

Calculate the number of Oxygen atoms in Al(OH)₃

• 1

• 2

• 3

• 4

The ______ are numbers found on the lower right-hand side of an element symbol.

• Coefficient

• Exponent

• Multiplier

• Subscript

Coefficients in chemical formulas...

• Multiply just the first atom

• Add to the subscripts at the end of the molecule

• Multiply elements without subscripts

• Multiply EVERYTHING!

H₂SO₄

• H = 2, S = 4, O = 4

• H = 2, S = 1, O = 4

• H = 8, S = 4, O = 4

• H = 2, SO = 4

A ______ is a number written in front of a chemical formula.

• Coefficient

• Subscript

• Exponent

• Coordinator

How many Hydrogen atoms are in 4H₂O?

• 6

• 8

• 2

• 4

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

How many atoms are there TOTAL in H₂SO₄ ?

• 6

• 5

• 7

• 3

How many Oxygen atoms are in Al₂(SO₄)₃?

• 4

• 12

• 7

• 24

Which of the following is a compound?

• Co
• O₂
• C
• CO₂