Quiz about Stoichiometry Practice Limiting Reactant

Question 1

The limiting reactant

Accepted Answer

is used up first

Answer

.

Answer

is the reactant that is left over

Answer

.

Question 2

The excess reactant

Accepted Answer

is the reactant that is left over

Answer

.

Answer

is used up first

Answer

.

Question 3

1 Body + 4 Tires --> 1 car
How many cars can you make with 92 tires and 34 bodies?

Accepted Answer

23

Answer

34

Answer

68

Answer

46

Question 4

1 Body + 4 Tires --> 1 car
How many cars can you make with 92 tires and 34 bodies?
In this senario the tires would be the _____________ reactant.

Accepted Answer

Limiting

Answer

Excess

Question 5

When the limiting reactant is used up, what happens?

Accepted Answer

the reaction stops

Answer

the reaction speeds up

Answer

the reaction slows down

Answer

the reaction moves to its 2nd stage

Question 6

What are the correct steps for determining the limiting reactant?

Accepted Answer

divide the moles of each reactant by its coefficient and look for the smallest number

Answer

divide each reactant by its molar mass and look for the smallest number

Answer

balance the chemical equation and look for the smallest coefficient

Answer

divide each reactant by Avogadro's number and look for the smallest number

Question 7

What is the measured amount of a product obtained from a chemical reaction?

Accepted Answer

actual yield

Answer

mole ratio

Answer

theoretical yield

Answer

percentage yield

Question 8

True or False?
A chemical reaction stops before the limiting reagent is used up.

Accepted Answer

False

Answer

True

Question 9

When does a reaction stop?

Accepted Answer

When all the limiting reactant has been consumed

Answer

When it wants to

Answer

When both the limiting and excess reactants are gone

Answer

When all the excess reactant has been consumed

Question 10

What is the limiting reactant if 10 moles of NH₃ react with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

Accepted Answer

NH3

Answer

NO

Answer

N2

Answer

water

Question 11

What is the limiting reactant if 15 moles of NH₃ react with 16 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

Accepted Answer

NO

Answer

NH3

Answer

N2

Answer

water

Question 12

*Look back at preceding question. * What is the limiting reactant if 15 GRAMS of NH₃ react with 16 GRAMS of NO?
4NH₃+6NO --> 5N₂ + 6H₂O
(Remember, convert grams to moles, then divide each substance by the number of moles given as the coefficient from the balanced chemical equation).

Accepted Answer

NO is the limiting reactant because the reaction only requires 0.088 mol NO

Answer

NH₃is the limiting because the reaction only requires 0.22 mol of NH₃

Answer

NH₃is the limiting because the reaction only requires 0.88 mol of NH₃

Answer

NO is the limiting reactant because the reaction only requires 0.53 mol NO

Question 13

True or False?
The actual yield is usually greater than the theoretical yield.

Accepted Answer

False

Answer

True

Question 14

Mole ratios are obtained from the

Accepted Answer

balanced chemical equation

Answer

periodic table

Answer

molar mass

Question 15

What is stoichiometry?

Accepted Answer

The study of how the quantities of reactants and products are related in chemical reactions

Answer

The study of the speed of reactions

Answer

The study of how chemical reactions occur

Answer

The study of types of reactions

Question 16

Stoichiometry is based on the law of conservation of

Accepted Answer

mass

Answer

charge

Answer

reactants

Answer

volume

Question 17

In a balanced equation, the ratio between the coeffients of any two substances is called the _______.

Accepted Answer

mole ratio

Answer

stoichiometry

Answer

limiting reactant

Answer

excess reactant

Question 18

The study of quantitative relationships between the amounts of reactants used and products formed by a chemical reaction; is based on the law of conservation of mass

Accepted Answer

stoichiometry

Answer

percent yield

Answer

mole ratio

Answer

limiting reactant

Question 19

A reactant that remains after a chemical reaction stops

Accepted Answer

excess reactant

Answer

stoichiometry

Answer

mole ratio

Answer

limiting reactant

Question 20

A reactant that is totally consumed during a chemical reaction, limits the extent of the reaction, and determines the amount of product

Accepted Answer

limiting reactant

Answer

stoichiometry

Answer

mole ratio

Answer

excess reactant

Question 21

To determine the limiting reactant in a chemical reaction, one must know the

Accepted Answer

available amount of each of each reactant

Answer

amount of product formed

Answer

available amount of one of the reactants

Answer

speed of the reaction

Question 22

The coefficients in a chemical equation represent the

Accepted Answer

relative numbers of moles of reactants and products

Answer

number of atoms in each compound in a reaction

Answer

masses, in grams, of all reactants and products

Answer

number of valence electrons involved in the reaction

Question 23

A chemical reaction involving substances A and B stops when B is completely used.  B is the

Accepted Answer

limiting reactant

Answer

excess reactant

Answer

primary reactant

Answer

primary product

Question 24

Stoichiometry is based on _____________.

Accepted Answer

law of conservation of mass

Answer

the law of constant ratios

Answer

Avogadro's constant

Answer

percent composition

Question 25

Mole ratios are obtained from the ________________.

Accepted Answer

balanced chemical equation

Answer

molar masses

Answer

periodic table

Answer

subscripts

Question 26

What is the first thing you must do to solve a stoichiometric problem?

Accepted Answer

write a balanced chemical equation

Answer

find the excess reactant

Answer

find the limiting reactant

Answer

find the empirical formula

Question 27

How do you determine the limiting reactant?

Accepted Answer

Find the amount of product produced by each amount of reactant. The reactant that makes the least is the limiting reactant.

Answer

Find the amount of product produced by each amount of reactant. The reactant that makes the most is the limiting reactant.

Answer

The reactant with the least amount of mass (grams) present is the limiting reactant.

Answer

Cannot be determined.

Stoichiometry Practice Limiting Reactant

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