Unit 4: Chemical reactions

Front

Bromine liquid being boiled and turning into bromine gas would be an example of a physical or chemical change?

Back

Physical (changes in states of matter are physical)

Front

Sodium Carbonate decomposing into sodium oxide and carbon dioxide would be an example of a physical or chemical change?

Back

Chemical (New products are formed)

Front

Burning logs in a campfire would be an example of physical or chemical change?

Back

Chemical (This is a combustion reaction)

Front

How many atoms of oxygen are present in 4 molecules of AgNO₃?

Back

12 (each molecule has 3 atoms of oxygen and there are 4 of them)

Front

Balance the following reaction:

H₂ + O₂ --> H₂O₂

Back

H₂ + O₂ --> H₂O₂

(It is already balanced!)

Front

Balance the following reaction:

Mg + N₂ --> Mg₃N₂

Back

3 Mg + N₂ --> Mg₃N₂

Front

Balance the following reaction:

Ca(OH)₂ + LiF --> LiOH + CaF₂

Back

Ca(OH)₂ + 2 LiF --> 2 LiOH + CaF₂

Front

Balance the following reaction:

C₆H₆ + O₂ --> CO₂ + H₂O

Back

2 C₆H₆ + 15 O₂ --> 12 CO₂ + 6 H₂O

Front

Balance the following reaction:

Na₂SO₄ + AlBr₃ --> NaBr + Al₂(SO₄)₃

Back

3 Na₂SO₄ + 2 AlBr₃ --> 6 NaBr + Al₂(SO₄)₃

Front

Balance the following reaction:

MgS + RbNO₃ --> Rb₂S + Mg(NO₃)₂

Back

MgS + 2 RbNO₃ --> Rb₂S + Mg(NO₃)₂