General
Which law explains why we must use balanced chemical equations?
Law of Conservation of Mass
Balance the equation:
Be + HF --> BeF2 + H2
Be + 2HF --> BeF2 + H2
Which type of reaction is the following:
H2 + Br2 -->
Synthesis
Predict the products and balance:
KF + Be -->
2KF + Be —> BeF2 + 2K
How many oxygens are represented by:
3H2O2
6
What is a subscript?
Balance the Equation:
Na2CO3 + CaI2 --> NaI + CaCO3
Na2CO3 + CaI2 --> 2 NaI + CaCO3
Which type of reaction is the following:
KMnO4 + CaBr2 -->
Double Replacement
Predict the products and balance:
O2 + H5C2OH -->
3O2 + H5C2OH —> 2CO2 + 3H2O
How many oxygens are in
Al2(SO4)3
12
What is a coefficient
The number we place in front of compounds to balance equations
Balance the Equation:
Al + H2S --> Al2S3 + H2
2 Al + 3 H2S --> Al2S3 + 3 H2
Which type of reaction is the following:
O2 + C4H8 -->
Combustion
Predict the products and balance:
Calcium reacts with oxygen
2Ca + O2 —> 2CaO
How many oxygens are in
3 Mg(ClO3)2
18
What are the products?
What is produced in a chemical reaction located to the right of the reaction arrow
Balance the equation:
C3H6 + O2 --> CO2 + H2O
2 C3H6 + 9 O2 --> 6 CO2 + 6 H2O
Which type of reaction is the following:
Ag2O + W -->
Single Replacement
Predict the products and balance:
Sodium Carbonate reacts with Aluminum chlorate
3Na2CO3 + 2Al(ClO3)3 —> 6NaClO3 + Al2(CO3)3
How many products are present in a synthesis reaction?
1
What does diatomic mean and which elements are diatomic
Diatomic: the atoms come in pairs
Br I N Cl H O F
Balance the Equation:
NaFeO4 + HBr --> NaBr + FeBr2 + H2O + Br2
2NaFeO4 + 16HBr --> 2NaBr + 2FeBr2 + 8H2O + 5Br2
Which type of reaction is the following:
H2O2 -->
Decomposition
Predict the products and balance the equation:
Nitrogen tetrahydride is heated
Why is the subscript for oxygen "2" in the following equation?
NaMnO4 --> K + Mn + O2
Oxygen is diatomic