Counting Atoms

How many Magnesium are in 10MgCl₂?

• 10
• 5
• 20

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

How many atoms are there TOTAL in:
H₂SO₄

• 6
• 5
• 7
• 3

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6

How many O's are in Al₂(SO₄)₃

• 4
• 12
• 7
• 24

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!

C₃H₅(NO₃)₃

• C = 3, H = 5, N = 3, O = 9

• C = 3, H = 5, N = 1, O = 9

• C = 9, H = 15, N = 3, O = 9

• C = 9, H = 15, N = 1, O = 3