Free Printable Limiting Reactants and Chemical Reactions

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Limiting Reactants and Chemical Reactions

Total questions: 56

Worksheet time: 2hrs 54mins

Name

Class

Date

This is what you call a reactant that you have enough of. The one that DOES NOT run out.

Limiting Reactant

Excess Reactant

Highly Reactant

Super Reactant

A limiting reactant is a reactant that.....

runs out during a chemical reaction

causes a reaction to stop

determines the amount of products that can be made

all of these

Using the following equation:

Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)

How many moles of iron can be made from 6 moles H₂and excess Fe₂O₃?

4 moles Fe

6 moles Fe

9 moles Fe

2 moles Fe

The limiting reactant

slows the reaction down

is used up first

is the reactant that is left over

controls the speed of the reaction

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

AlCl3

Cl2

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

NH₃

N₂

water

P₄+ 3O₂--> P₄O₆
What is the limiting reactant is 12 moles of P₄react with 15 moles of O₂?

P₄

O₂

P₄O₆

none of the above

P₄+ 3O₂--> P₄O₆

How many moles of P₄O₆can be made if 3 moles of P₄react with 6 moles of O₂?

1 mole

2 moles

4 moles

0 moles

How much water can be made if 8 moles of NH₃ react with 6 moles of NO?

4NH₃+6NO --> 5N₂ + 6H₂O

5 moles

6 moles

12 moles

18 moles

10.

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 3 moles of chlorine are reacted, how much AlCl₃can be made?

1 mole

2 moles

4 moles

0 moles

11.

What is a limiting reactant?

the reactant that determines how much product can be made

the reactant that is in excess

the product that you can make the most of

the amount of reactants that react with each other

12.

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?

bread

jelly

peanut butter

sandwich

13.

What is the molar mass of sodium?

45.98

14.

In this image, what are the information in red is called the_______.

Product

Reactant

Chemical Subscript

Yield

15.

In this image, what are the information to the right of the arrow (in black) is called the_______.

Product

Reactant

Chemical Subscript

Yield

16.

Read the following chemical formula: C₆H₁₂O₆. How many hydrogen atoms are in the formula?

17.

Why is the following chemical equation not balanced?
H_{2 +}O₂--> H₂O

each side of the equation has a different number of oxygen atoms

each side of the equation has a different number of hydrogen atoms

each side has the same mass

there are no coefficients

18.

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂--> 2Al₂O₃

19.

What is the arrow in a chemical equation...
H_{2 +}O --> H₂O

Reactants

Products

Yields

Chemical Equation

20.

The limiting reactant

slows the reaction down

is used up first

is the reactant that is left over

controls the speed of the reaction

21.

When does a chemical reaction stop?

When the lab is finished

When the excess reactant is used up

When the limiting reactant is used up

Chemical reactions never stop

22.

When 6 moles of O₂ reacts with 2 moles of H₂what is the limiting reactant? 2 H₂ + 6 O₂ --> 2 H₂O

Oxygen

H₂

Water

23.

When 6 moles of O₂ reacts with 12 moles of H₂what is the limiting reactant? 12 H₂ + 6 O₂ --> 12 H₂O

Oxygen

H₂

Water

Neither, Ratios are perfect

24.

When 2 moles of O₂ reacts with 3 moles of H₂what is the limiting reactant? 3 H₂ + 2 O₂ --> 2 H₂O

Oxygen

H₂

Water

Neither, Ratios are perfect

25.

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from 6 moles H₂?

4 moles Fe

6 moles Fe

9 moles Fe

2 moles Fe

26.

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

27.

When something burns, it reacts with the __________ in the air.

Nitrogen

Oxygen

Carbon dioxide

Neon

28.

In a chemical reaction,

no new substance is formed

a new substance is formed

products and reactants have the same properties

reactants are not needed

29.

In this image, which chemical formula is incorrectly written in the chemical reaction.

NaCl

All correct

30.

What is the mass in grams of 5.90 mol C₈H_18?

.0512 g

19.4 g

673 g

389 g

31.

How many moles are in 19.82 g Mg?

1.226mol Mg

481.7mol Mg

1.000mol Mg

0.8156 mol Mg

32.

Determine the molar mass for carbon tetrachoride (CCl₄)

153.82 g/mol

118.37 g/mol

189.35 g/mol

47.46 g/mol

33.

What is the mass in grams of 2.3456 moles of W?

431.22 grams

6.02 grams

207.2 grams

486.01 grams

34.

How many moles are in 1459 grams of Na?

63.46 moles

60.36 moles

10 moles

1 mole

35.

What is the molar mass of Al₂S₃?

150.17 g/mol

59.05 g/mol

138.23 g/mol

75.27 g/mol

36.

How many grams are in 0.523 mol of AlPO₄?

63.78 g

38.68 g

47.23 g

55.43 g

37.

How many grams are equal to 0.11 mole of copper (I) chromate, Cu₂(CrO₄)?

26.74 g

19.75 g

39.50 g

13.69 g

38.

How many moles are in 100. g of carbon dioxide, CO₂?

2.27 mol

2.36 mol

3.51 mol

1.49 mol

39.

A baker needs 6.0 g of baking soda for a recipe. The chemical formula for baking soda is NaHCO₃. How many moles of baking soda is needed?

0.071 mol

0.167 mol

0.273 mol

0.214 mol

40.

Which compound has the smallest molar mass?

CO₂

H₂O

H₂O₂

41.

Which conversion factor should be used to solve the following, "How many moles of argon atoms are present in 11.2 L of argon gas at STP?"

1 mol = 22.4 L

1 mol = 39.95 g

1 mol = 6.02x10²³ atoms

More than 1

42.

Which conversion factor should be used to solve the following, "How many moles in 28 grams of CO₂?"

1 mol = 22.4 L

1 mol = 44.01 g

1 mol = 6.02x10²³ atoms

more than one

43.

88.0 grams of CO₂ is about _____________. [Select 3 answers.]

1 mole of CO₂

2 moles of CO₂

6.02 x 10²³ molecules of CO₂

two times 6.02 x 10²³molecules of CO₂

2 moles of carbon atoms and 4 moles of oxygen atoms

44.

The molar mass of an element is equal to its...

Atomic mass

Atomic number

Oxidation number

Valence electrons

45.

The mass of one mole of substance is called...

molecular mass

mole constant

molar mass

atomic weight

46.

What is the molar mass of sodium?

45.98

47.

What is the mass of one mole of aluminum?

27 g

13 g

54 g

14 g

48.

What is the mass of one mole of aluminum (Al)?

27 g

13 g

54 g

14 g

49.

Which compound below has the smallest molar mass?

CO₂

H₂O

H₂O₂

50.

Which has a greater mass: 1 mole of sodium (Na) or 2 moles of lithium (Li)?

1 mole of sodium

2 moles of lithium

neither

more information is needed.

51.

What is the mass of 1 mole of calcium carbonate, CaCO₃?

99.01 g

100.09 g

216.87 g

84.09 g

52.

What is the molar mass of table salt (NaCl)?

805 g/mol

35 g/mol

23 g/mol

58 g/mol

53.

Calculate the molar mass of CO₂.

14 g/mol

28 g/mol

36 g/mol

44 g/mol

54.

Calculate the molar mass of NH₄NO₂

50 g/mol

60 g/mol

64 g/mol

78 g/mol

55.

What is the molar mass of ammonia , NH₃

17 grams/mole

18 grams/mole

20 grams/mole

5 grams/mole

56.

What are the units for molar mass?

grams

amu

grams/mole

liters

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Limiting Reactants and Chemical Reactions

Total questions: 56

Worksheet time: 2hrs 54mins

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