Free Printable Chemistry Quiz Assignment

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Chemistry Quiz Assignment

Total questions: 20

Worksheet time: 1hrs 1mins

Name

Class

Date

What is the mass of 6.02 x 10²³platinum atoms? Round to the nearest hundredths place.

30.97 g

106.42 g

140.91 g

195.09 g

If one Monster energy drink contains 0.16 g of caffeine, how many moles of caffeine do we consume when we drink 1 can? The chemical formula for caffeine is C₈H₁₀N₄O₂.

194.19 moles

1.07 moles

0.00082 moles

1213.69 moles

What is the molar mass of one molecule of Nitrogen N₂?

14.01 amu

14.01 g

28.02 g

28.02 amu

What is the percent by mass of magnesium in MgO?

20%

40%

50%

60%

How many grams are in 1.2 x 10²⁴ molecules of CO? (molar mass of CO = 28 g/mol)

28.2 g

55.8 g

6.02 g

1.2 g

Find the Molar Mass of:
Ga₂(SO₃)₃

280 g/mol

400 g/mol

380 g/mol

480 g/mol

What is the volume of 5 moles of oxygen gas?

112 L

22.4 L

120 L

24 L

Which volume will be occupied by a gas containing 6.02 x 10²³ atoms of He?

1.0 L

24 L

22.4 L

44.8 L

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃? (Atomic mass of Al = 27, H= 1, O = 16)

1.26 moles

0.8 moles

7,673.4 moles

150 moles

10.

How many atoms are contained in 25 g of NaBr? (Atomic mass of Na = 23, Br = 35)

102.96 molecules

0.24 molecules

1.45x10²³ molecules

2.34 x 10²⁰molecules

11.

How many moles are in 3.01 x 10²² atoms of magnesium?

0.0500 moles

1.81 x 10⁴⁶ moles

5.00 x 10²¹ moles

5.00 moles

12.

What is the volume of 5 moles of oxygen gas at room temperature?

112 dm³

112 cm³

120 L

120 mL

13.

Find the percent composition of Cu₂S?

%Cu= 67.987 %S= 32.013

%Cu= 79.854 %S= 20.145

%Cu= 35.946 %S= 64.054

14.

How many percent of chlorine is present in chloroform?

10.06%

0.84%

89.09%

99.99%

15.

The limiting reactant is the reactant that __________ .

slows down the reaction

used up first

left over at the end of reaction

controls the speed of the reaction

16.

Theoretical yield = 73g

Actual yield = 62g

Calculate the percent yield.

17.7%

117.7%

84.9%

15.1%

17.

4NH₃+ 5O₂→ 4NO + 6H₂O

Based on reaction above, oxygen is a limiting reactant. Calculate the mass of NO formed if the mass of oxygen reacted is 1.80g.

0.37g

0.045g

1.35g

11.1g

18.

2H₂ + O₂ → 2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

4 moles

8 moles

16 moles

2 moles

19.

When 24.0 g of an impure sample of aluminium was reacted with iron oxide, 45.7 g of iron was formed.

Part 1 - Calculate the number of moles of Fe

0.08183 moles

0.8183 moles

1.222 moles

0.4297 moles

20.

When 24.0 g of an impure sample of aluminium was reacted with iron oxide, 45.7 g of iron was formed.

8 Al + 3 Fe₃O₄ --> 4 Al₂O₃ + 9 Fe

Part 2 - Use the equation to work out how many moles of Al would have been needed and convert this to a mass.

0.7274

22.08

19.6

40.62

100 %

Chemistry Quiz Assignment

Total questions: 20

Worksheet time: 1hrs 1mins

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