This document contains information about chemical formulas, equations, and reactions. It provides examples of identifying elements in a compound, describing what a chemical equation shows, and explaining what coefficients and subscripts indicate in a chemical formula. The final question identifies the reactants, products, subscripts, and coefficients in the equation: 6 CO2 + 6 H2O + light → C6H12O6 + 6 O2, showing carbon dioxide and water reacting with light to form glucose and oxygen.

1. 1801701601501401301201101009080706050403020109876543210
This screen will disappear in 3 minutes.
Seconds
Remaining.
Propane has three atoms
of carbon and eight
atoms of hydrogen.
What is propane's
chemical formula?

2. C3H8

3. 1801701601501401301201101009080706050403020109876543210Seconds Remaining:Seconds Remaining:
List the elements in this
compound: H2SO4
How many atoms of each
element are in the compound?

4. H2SO4
Hydrogen – 2 atoms
Sulfur – 1 atom
Oxygen – 4 atoms

5. 18018017017016016015015014014013013012012011011010010090908080707060605050404030302020101099887766554433221100Seconds Remaining:Seconds Remaining:
What does a
chemical equation
tell us?

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. 18018017017016016015015014014013013012012011011010010090908080707060605050404030302020101099887766554433221100Seconds Remaining:Seconds Remaining:
A student wrote the following
equation:
4Al + 3O2 2Al2O3
– Write a sentence to describe
what occurs in this reaction.

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

9. 18018017017016016015015014014013013012012011011010010090908080707060605050404030302020101099887766554433221100Seconds Left:Seconds Left:
What do coefficients &
subscripts show us in
chemical formulas?

10. Coefficients – the number of
molecules
Subscripts – 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

11. 18018017017016016015015014014013013012012011011010010090908080707060605050404030302020101099887766554433221100Seconds Remaining:Seconds Remaining:
Identify the reactants, products, subscripts,
and coefficients in this chemical equation:
6 CO2 + 6 H2O + light → C6H12O6 + 6 O2

12. 6 CO2 + 6 H2O + light → C6H12O6 + 6 O2
Coefficients
Subscripts
Carbon Dioxide + Water + Light energy → Glucose + Oxygen
Reactants:
CO2
H2O
light
Products:
C6H12O6
O2