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? This screen will disappear in 3 minutes. 8 7 9 20 6 10 4 2 3 180 5 30 130 120 140 70 50 60 40 170 160 150 80 110 90 100 1 Seconds Remaining.

C3H8

List the elements in this compound: H2SO4 How many atoms of each element are in the compound? 9 8 10 20 30 7 5 2 3 4 180 6 40 130 140 50 120 70 60 1 160 170 110 150 80 100 90 Seconds Remaining:

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

What does a chemical equation tell us? 9 8 10 20 30 7 5 2 3 4 180 6 40 130 140 50 120 70 60 1 160 170 110 150 80 100 90 Seconds Remaining:

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.

A student wrote the following equation: 4Al + 3O2 2Al2O3 – Write a sentence to describe what occurs in this reaction. 9 8 10 20 30 7 5 2 3 4 180 6 40 130 140 50 120 70 60 1 160 170 110 150 80 100 90 Seconds Remaining:

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

What do coefficients & subscripts show us in chemical formulas? 9 8 10 20 30 7 5 2 3 4 180 6 40 130 140 50 120 70 60 1 160 170 110 150 80 100 90 Seconds Left:

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, 12 - 9 H2SO4 = 2 – hydrogen 1 – Sulfur 4 – Oxygen subscript coefficient

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 4 180 6 40 130 140 50 120 70 60 1 160 170 110 150 80 Seconds Remaining: 100 90

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