Balancing Equations
Types of Chemical Reactions
Predicting Products
Stoichiometry
Limiting & Excess Reactants
100

What coefficient goes in front of Fe in this chemical equation to be correctly balanced? 

____ Fe + ____ O2 --> ____ Fe2O3

4

100

Classify the following chemical reaction: 

2 H2O2 --> 2 H2O + O2 

Decomposition

100

What is the formula when you combine Beryllium and Oxygen together? 

BeO

100

Understanding stoichiometric relationships enables you to 

predict the amount of products formed

100

The limiting reactant in a completed chemical reaction will be the substance that is 

a) left over 

b) used up 

c) with the greatest mass before the reaction begins 

d) with the least mass before the reaction begins

b) used up
200

Balance the following chemical equation: 

_____N2O5 --> ____ NO2 + ____ O2

2 N2O5 --> 4 NO2 + O2

200

Classify the following chemical reactions: 

2 Ag + Cl2 --> 2 AgCl 

synthesis

200

Predict the products given the following reactants: 

Al+ O2 --> 

Al2O3 

200

What is the mole ratio between sodium and magnesium in the following chemical reaction: 

2 Na + MgCl2 --> 2 NaCl + Mg

2:1

200

Use the following equation to answer the question:

Mg3N2 + 6H2O --> 3 Mg(OH)2 + 2 NH3 

You find that when you have 3.00 grams of Mg3N2 you produce 1.33 L of NH3 and when it reacts with 5.00 grams of H2O you produce 2.07 L of NH3. What is your limiting reactant?

Mg3N2

300

What is the SUM of the coefficients when this equation is correctly balanced? 

____ Mg(OH)2 + ____ HCl --> _____ MgCl2 + ____ H2O 

6
300

This type of chemical reaction an acid and a base combine to produce water and a salt.

Neutralization

300

Predict the products given the following reactants: 

Zn + CuSO4 -->

ZnSO4 + Cu

300

Given the following balanced equation, how many moles of chlorine gas can be produced if you have 4 moles of FeCl3? 

4FeCl3 +3O2 --> 2 Fe2O3 + 6 Cl2

6 mol Cl2

300

True or False:

There is never any mass of the limiting reagent left at the end of the reaction

true

400

True or False: 

When balancing equations it is often necessary to change the subscripts of a compound in order to maintain the law of conservation of matter. 

False

400
What chemical reaction must have oxygen gas as a reactant?

combustion

400

Predict the products for the following reactants: 

C3H8 + O2 --> 

CO2 + H2O

400

Given the following balanced equation, how many moles of H2O are used to produce 7.6 g of H2? 

2 Na + 2 H2O --> 2 NaOH + H2 

7.5 mol H2O

400

How many grams of hydrogen gas can be produced from the following reaction if 65 grams of zinc and 65 grams of HCl are present in the reaction?

Zn + 2 HCl --> ZnCl2 + H2

1.8 g H2

500

What is the law of conservation of matter? 

Matter can neither be created nor destroyed

500

Classify the following reaction: 

Al2O3 + H2SO4 --> Al2(SO4)3 + H2O

Neutralization

500
Predict the products when magnesium bromide and chlorine react together and then balance the chemical equation.

MgBr2 + Cl2 --> MgCl2 + Br2

500

Given the following balanced equation, how many formula units of sodium chloride are produced from 23.3 mole of calcium chloride? 

CaCl2 + Na2SO4 --> CaSO4 + 2 NaCl

2.81 x 1025 formula units of NaCl

500

Use the following equation: 

2 Hg(NO3)2 --> 2 HgO + 4 NO2 + O2

When 12.0 g of Hg(NO3)2 are decomposed in the lab, it is found that 7.56 g of HgO are produced. What is the actual yield, the theoretical yield, and the percent yield? 

Actual yield = 7.56 g HgO (always given in the problem)

Theoretical yield = 8.01 g HgO (find through stoichiometry) 

% yield = 94.4% 

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