Free Printable Stoich Concepts Practice

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Stoich Concepts Practice

Total questions: 19

Worksheet time: 31mins

Name

Class

Date

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

Write a Balanced Equation

Panic

Write an Unbalanced Equation

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Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl₂.

1 Mg + 2 HCl --> 1 MgCl₂ + 1 H₂

H₂

MgCl₂

HCl

What is the mass of 1 mole of Oxygen?

16 g

16 amu

16 x # of moles

16 x Avagadro's number

Rounded what is the mass of 1 moles of Hydrogen molecule (H₂)?

1 amu

1 g

2 g

2 amu

Avagadro's number equals

6.02 x 10²³atoms

6.02 x 10²³ formula units

6.02 x 10²³ molecules

All of these

Conservations of mass says that the number of atoms in a reaction are ________ as the number of atoms that produced

the same

different

warmer

colder

Stoichiometry is measuring chemicals....

Penguins Defenseman Jack Johnson

with the equal amount of reactants and products

that go into, and come out of, any reaction

in a balanced equation

One mole of a single atom of any element (found on the Periodic Table) is the same as the ________ in grams.

atomic mass

# of protons - # of neutrons

atomic number

Group #

Molar Mass

the reactant that gets all used up

6.02 x 10^23

the mass in grams of a mole of a substance

the number before a formula in a balanced equation

10.

Excess Reactant

6.02 x 10^23

the mass in grams of a mole of a substance

the reactant that has some left over at the end of the reaction

the number before a formula in a balanced equation

11.

Limiting Reactant

the reactant that gets all used up

the reactant that has some left over at the end of the reaction

comparing moles of a substance

6.02 x 10^23

12.

Mole to mole ratio

6.02 x 10^23

the mass in grams of a mole of a substance

the number before a formula in a balanced equation

comparing moles of substances

13.

Coefficient

calculating quantities in balanced chemical reactions

6.02 x 10^23

comparing moles of substances

the number before a formula in a balanced equation

14.

This equation is balanced: 2H2 + 2O2 -> 2H2O

True

False

15.

You can compare grams of H2O to moles of O2.

True

False

16.

You can only compares moles to moles of different substances.

True

False

17.

When the limiting reactant is used up, what happens?

the reaction speeds up

the reaction slows down

the reaction moves to its 2nd stage

the reaction stops

18.

Which of the following steps is the correct way to determine the mass of a product produced from a given mass of a reactant?

convert to moles of reactant, convert to moles of product, convert to grams of product

convert to grams of product, convert to moles of reactant, convert to moles of product

convert to moles of product, convert to grams of product

convert to grams of product

19.

True or False. You must convert grams to moles to do stoichiometry.

True

False

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Stoich Concepts Practice

Total questions: 19

Worksheet time: 31mins

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