Counting Atoms

How many elements are in C₆H₁₂O₆?

(a)  

Tags

NGSS.MS-PS1-1

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6

How many atoms of Hydrogen are in chemical formula for water, H₂O?

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

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!

4CF₂Cl₂

• C = 4, F = 4, Cl = 2

• C = 1, F = 8, Cl = 8

• C = 4, F = 8, Cl = 8

• C = 1, F = 4, Cl = 8

Tags

NGSS.MS-PS1-1

H₂SO₄

• H = 2, S = 4, O = 4

• H = 2, S = 1, O = 4

• H = 8, S = 4, O = 4

• H = 2, SO = 4

Tags

NGSS.MS-PS1-1

A ______ is a number written in front of a chemical formula to express how many compounds are present.

• Coefficient

• Subscript

• Exponent

• Coordinator

2H₂ + O₂ ----> 2H₂O What is the product?

• 2H₂+ O₂

• 2H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2H₂ + O₂ --------> 2H₂O What are the reactants?

• 2H₂+O₂

• 2H₂O

Tags

NGSS.MS-PS1-2