WorksheetsMolar Ratios 8th
Total questions: 20
Worksheet time: 34mins
Name
Class
Date
1.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
2.
For the Balanced Reaction:
3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe;
What is the Ratio of moles of Mg to moles Fe?
3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe;
What is the Ratio of moles of Mg to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
3.
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, what is the limiting reactant?
If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?
a)
bread
b)
jelly
c)
peanut butter
d)
sandwich
4.
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make 1 sandwich.
If you have 10 pieces of bread, 5 tablespoons of peanut butter and 10 tablespoons of jelly, how many sandwiches can you make?
If you have 10 pieces of bread, 5 tablespoons of peanut butter and 10 tablespoons of jelly, how many sandwiches can you make?
a)
10 sandwiches
b)
3 sandwiches
c)
15 sandwiches
d)
5 sandwiches
5.
What is a Limiting Reagent?
a)
speeds up a reaction
b)
what you run out of first
c)
what you have left over
d)
slows down a reaction
6.
What is a Excess Reagent?
a)
amount you end with
b)
what you run out of first
c)
what you have left over
d)
what you start with
7.
2H2 + O2 → 2H2O
How many moles of water can be produced if 8 moles H2 are used?
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
8.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
d)
our minds
9.
N2 + 3H2 → 2NH3
How many moles of hydrogen are needed to react with 5 moles of nitrogen?
How many moles of hydrogen are needed to react with 5 moles of nitrogen?
a)
6 mol
b)
2 mol
c)
3 mol
d)
15 mol
10.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
11.
2H2 + O2 → 2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
How many moles of oxygen are consumed if 8 moles H2 are used?
a)
2
b)
4
c)
6
d)
8
12.
In the reaction
2 H2 + O2 → 2 H2O
what is the mole ratio of oxygen to water
2 H2 + O2 → 2 H2O
what is the mole ratio of oxygen to water
a)
1:2
b)
2:1
c)
3:4
d)
4:3
13.
What is the ratio of flames to arms on the candle?
a)
3:2
b)
3:5
c)
11/10
14.
If we have the following recipes for juice, which one will taste the most cherry:
Sam: 1 part cherry, 4 parts sprite
Katie: 2 parts cherry, 4 parts sprite
Michael: 6 parts cherry, 8 parts sprite
Sam: 1 part cherry, 4 parts sprite
Katie: 2 parts cherry, 4 parts sprite
Michael: 6 parts cherry, 8 parts sprite
a)
Michael
b)
Katie
c)
Sam
15.
a)
20 pencils
b)
24 pencils
c)
96 pencils
d)
48 pencils
16.
Which one is a real life example of a RATIO?
a)
12 noodles
b)
4 meatballs : 1 cup of sauce
c)
1 jar of sauce
d)
15 desserts
17.
In a certain apartment building, the ratio of tenants to cars is 3:5.
If there are 30 tenants, how many cars are there?
If there are 30 tenants, how many cars are there?
a)
35
b)
60
c)
18
d)
50
18.
What is the ratio of red apples to green apples
a)
7 apples to 3 green
b)
4 red apples to 7 apples
c)
4 red apples to 3 green apples
d)
3 green apples to 4 red apples
19.
88 students for 4 classes
How many students per class?
How many students per class?
a)
22 students per class
b)
22 classes per student
c)
25 students per class
d)
25 classes per student
20.
Simplify the ratio of
35 : 14
35 : 14
a)
5 : 2
b)
2 : 5
c)
3 : 1
d)
35: 14
100 %
