Free Printable Unit 7 Test Review

Worksheets

Unit 7 Test Review

Total questions: 20

Worksheet time: 2hrs 40mins

Name

Class

Date

How many particles are found in a mole?

$6.022\ x\ 10^{23}$

$6.022\ x\ 1023$

$6022\ x\ 10^{23}$

$6022\ x\ 1023$

What are the units used for Molar Mass

grams

mols

g/mol

mol/g

How many grams are in 3 mol of carbon?

6 grams

12 grams

18 grams

36 grams

What is the correct equation to calculate the number of moles in 3.13 x 10²⁶ molecules of H₂O₂?

How many molecules of sugar (C₆H₁₂O₆) are in a mole?

24 molecules

180 molecules

180 g

6.02 x 10²³molecules

Convert 4.5x10²⁴ atoms to moles

0.747 particles

0.747 mol

2.71x10⁴⁷ mol

2.71x10⁴⁷ particles

A sample of AlCl₃ contains a total of 4.515 x 10²⁷atoms. What must be the mass of this sample?

2.500 x 10⁵ g

1.000 x 10^-6 g

18.75 g

1.01 x 10⁶ g

Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?

How many atoms of carbon are in 6.00 g of carbon?

1.20x10²⁴atoms C

6.02x10²³atoms C

3.01x10²³atoms C

1.50x10²³atoms C

10.

Find the percent composition of CaCl₂?

Ca: 36.11%; Cl: 63.88%

Ca: 53.12%; Cl: 100%

Ca: 36.11%; Cl: 83.56%

Ca: 46.11%; Cl: 63.88%

11.

What is the percent by mass of chlorine in NaCl?

39%

61%

35%

65%

12.

A formula with the lowest whole # ratio of elements in a compound is called

Molecular Formula

Chemical Formula

Empirical Formula

Distance Formula

13.

What is the empirical formula for C₄H₆?

CH₃

C₂H₃

C₄H₆

14.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO₂

SO₃

SO₄

15.

A compound consists of 72.2% magnesium and 27.8% nitrogen by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

16.

What is the molecular formula for a compound with the empirical formula: K₂SO₄and a molecular mass of 696g.

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

17.

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

ionic formula

covalent formula

empirical formula

molecular formula

18.

Na₂CO₃ · 10H₂O is known as sodium sulfate ______

Hydroxide

Hydrate

Decahydrate

None of the above

19.

A 4.175 gram sample of a certain hydrate of copper (II) sulfate, CuSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 3.120 grams. What is the formula of the hydrate?

CuSO4•H2O

CuSO4•3H2O

CuSO4•6H2O

CuSO4•4H2O

20.

Match the following

The number of atoms in a compound.

MOLECULAR FORMULA definition

The simplest reduced ratio of elements in a compound.

EMPIRICAL FORMULA defintion

$N_2O_4$

MOLECULAR FORMULA example

$NO_2$

EMPIRICAL FORMULA example

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Unit 7 Test Review

Total questions: 20

Worksheet time: 2hrs 40mins

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