Download - Chemical Formulas and equations
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Propane has three atoms of carbon and
eight atoms of hydrogen. What is propane's chemical
formula?
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C3H8
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List the elements in this compound: H2SO4
How many atoms of each element are in the compound?
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H2SO4
Hydrogen – 2 atomsSulfur – 1 atomOxygen – 4 atoms
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What does a chemical equation
tell us?
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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.
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In this reaction, aluminum reacts with oxygen to form Al2O3.
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What do coefficients & subscripts show us in chemical formulas?
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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
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6 CO2 + 6 H2O + light → C6H12O6 + 6 O2
CoefficientsSubscripts
Carbon Dioxide + Water + Light energy → Glucose + Oxygen
Reactants:CO2
H2Olight
Products:
C6H12O6
O2