WorksheetsEquations and Stoichiometry Practice
Total questions: 32
Worksheet time: 31mins
Put the steps to solving a mass to mass stoichiometry problem in order. You have a solution of silver nitrate and a piece of solid copper. They react causing the silver to form a solid while the copper goes into a blue solution. If you are given 25 g of solid copper, how many grams of silver will you recover after the reaction?
AgNO3(aq) + Cu(s) --> Cu(NO3)2(aq) + Ag(s)
Balance the equation
Convert 25 g of copper to moles of copper by dividing by molar mass
Multiply by the mole ratio
Convert moles of silver to mass of silver by multiplying by molar mass
The coefficients needed to balance the reaction KNO3 --> KNO2 + O2 are (a) .
2, 2, 1
2, 3, 2
1, 2, 2
1, 3, 1
WO3 + H2 --> W + H2O
What coefficient goes in front of H2?
1
2
3
4
2H2 + O2 → 2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
2
4
6
8
What is a Limiting Reagent?
speeds up a reaction
what you run out of first
what you have left over
slows down a reaction
An excess reagent is (a) .
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, the number of sandwiches you can make is (a) .
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe?
3mol Mg / 2 mol Fe
2 mol Mg/ 3 mol Fe
1 mol Fe/ 2 mol Fe
3 mol MgO / 2 mol Fe
Match the following quantities of sodium with the mass of hydrogen gas produced in the reaction:
2Na + 2H2O → 2NaOH+ H2
5.2 g
120 g of Na
2.6 g
60 g of Na
690 g
16,000 g of Na
45 g
1,040 g of Na
2 KClO3 → 2 KCl + 3 O2
When 6.7 moles of KClO3 decompose completely, (a) moles of oxygen are produced.
How many moles are in 19.82 g Mg?
1.226mol Mg
481.7mol Mg
1.000mol Mg
0.82 mol Mg
How many particles are in a mole?
602
602 million
602 moles
6.02 x 1023
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron (Fe) can be made from 6 moles H2?
4 moles Fe
6 moles Fe
9 moles Fe
2 moles Fe
In a chemical reaction, the mass of reactants ___.
is less than the mass of products
is greater than the mass of products
has no relationship to the mass of products
is equal to the mass of products
Mole ratios are obtained from the
balanced chemical equation
periodic table
molar mass
The mole ratio of H2O to H3PO4 in the following chemical equation is (a) . P4O10 + 6 H2O --> 4 H3PO4
6:4
4:6
1:3
3:1
The molar mass of table salt (NaCl) is (a) .
What numbers in a balanced equation do we use to determine mole ratios?
Subscripts
Superscripts
Coefficients
Match the following compounds with their molar masses.
132 g
(NH4)2SO4
96 g
(NH4)2CO3
18 g
H2O
16 g
CH4
4 Al + 3 O2 –> 2 Al2O3 How many moles of aluminum would be needed to completely react with 45 grams of O2?
1.05 moles
3.75 moles
1.875 grams
1.875 moles
In a combustion reaction, (a) must always be a reactant.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
(a)
Synthesis
Decomposition
Single Replacement
The following is what type of reaction:
NH3 + HCl → NH4Cl
Synthesis
Decomposition
Single Replacement Replacement
Double Replacement Replacement
Decomposition is the process of (a) substances apart.
putting substances together
breaking substances apart
element replacing another element i
burning of a subtance
Ions in two compounds switch.
Synthesis
Combustion
Single Replacement
Double Replacement
One element replaces another in a compound is called (a) .
Identify the reaction type:
C4H12 + O2 → CO2 + H2O
Synthesis
Combustion
Single Replacement
Double Replacement
Which type of reaction has only one reactant?
synthesis
Double replacement
Chemical reaction
decomposition
Matter and mass can not be
Shaken or stirred
Made
created or destroyed
Transferred
Fe + H2SO4 --> Fe2(SO4)3 + H2
Synthesis (combination)
Decomposition
Single replacement
Combustion
Match the following descriptions with the correct chemical equation term as shown in the image below:
subscripts
The blue numbers written below the element symbols in the chemical equation
coefficients
The red numbers written in front of the chemical formulas in the equation
I don't know, and don't want to try
If you are unsure and do not wish to answer
None of the answers are correct
If none of the descriptions are correct
