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Propane has three atoms of carbon and

eight atoms of hydrogen. What is propane's chemical

formula?

C3H8

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List the elements in this compound: H2SO4

How many atoms of each element are in the compound?

H2SO4

Hydrogen – 2 atomsSulfur – 1 atomOxygen – 4 atoms

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What does a chemical equation

tell us?

Chemical equations tell us how many atoms or molecules react with each other and how much

of a substance is needed to react properly with another.

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A student wrote the following equation:

4Al + 3O2 2Al2O3

– Write a sentence to describe what occurs in this reaction.

In this reaction, aluminum reacts with oxygen to form Al2O3.

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What do coefficients & subscripts show us in chemical formulas?

Coefficients – the number of moleculesSubscripts – the number of atoms

No number is understood to be “1”

3H2SO4 =

H2SO4

H2SO4

H2SO4

6 – H, 3 – S, 12 - 9

H2SO4 =

2 – hydrogen

1 – Sulfur

4 – Oxygen coefficient

subscript

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Identify the reactants, products, subscripts, and coefficients in this chemical equation:

6 CO2 + 6 H2O + light → C6H12O6 + 6 O2

6 CO2 + 6 H2O + light → C6H12O6 + 6 O2

CoefficientsSubscripts

Carbon Dioxide + Water + Light energy → Glucose + Oxygen

Reactants:CO2

H2Olight

Products:

C6H12O6

O2