1. Propane has three atoms of carbon and eight atoms of hydrogen
Propane has three atoms of carbon and eight atoms of hydrogen. What is propane's chemical formula?
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2. C3H8

3. List the elements in this compound: H2SO4
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4. H2SO4
Hydrogen – 2 atoms
Sulfur – 1 atom
Oxygen – 4 atoms

5. What does a chemical equation tell us?9 8 10 20 30 7 5 2 3 4
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6. 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.

7. A student wrote the following equation: 4Al + 3O2 2Al2O3
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8. In this reaction, aluminum reacts with oxygen to form Al2O3.

9. What do coefficients & subscripts show us in chemical formulas?9 8 10 20 30 7 5 2 3 4
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10. 6 – H, 3 – S, 12 - 9 Coefficients – the number of molecules
Subscripts – the number of atoms
No number is understood to be “1”
3H2SO4 =
H2SO4
6 – H, 3 – S,
H2SO4 =
2 – hydrogen
1 – Sulfur
4 – Oxygen
subscript
coefficient

11. Identify the reactants, products, subscripts, and coefficients in this chemical equation:
6 CO2 + 6 H2O + light → C6H12O6 + 6 O2 9 8 10 20 30 7 5 2 3 4
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12. Carbon Dioxide + Water + Light energy → Glucose + Oxygen
6 CO2 + 6 H2O + light → C6H12O6 + 6 O2
Coefficients
Subscripts
Carbon Dioxide + Water + Light energy → Glucose + Oxygen
Reactants:
CO2
H2O
light
Products:
C6H12O6 O2