Question 1

Which set of coefficients correctly balances the following chemical equation:

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

?

Accepted Answer

2, 3, 4, 3

Answer

1, 3, 2, 3

Answer

1, 2, 2, 3

Answer

2, 3, 2, 3

Question 2

When balancing the combustion of propane,

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, what is the coefficient for the oxygen molecule (

O_{2}

)?

Accepted Answer

5

Answer

3

Answer

10

Answer

4

Question 3

What are the correct coefficients for the following reaction when it is balanced:

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

?

Accepted Answer

2, 6, 2, 3

Answer

2, 3, 2, 3

Answer

1, 6, 2, 3

Answer

1, 3, 1, 1

Question 4

Which of the following represents the balanced form of the reaction between phosphoric acid and calcium hydroxide:

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

?

Accepted Answer

2, 3, 1, 6

Answer

3, 2, 1, 6

Answer

1, 2, 1, 3

Answer

2, 2, 1, 4

Question 5

Balanced chemical equations must satisfy the Law of Conservation of Mass. For the reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, what is the sum of the coefficients in the simplest whole-number balanced equation?

Accepted Answer

19

Answer

14

Answer

12

Answer

21

Question 6

What are the correct coefficients for the following reaction when it is balanced:

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

?

Accepted Answer

1, 6, 4

Answer

2, 6, 4

Answer

1, 4, 4

Answer

1, 3, 2

Question 7

Identify the missing coefficients

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

and

O_{2}

to balance the following decomposition reaction:

xKClO_{3} \rightarrow 2KCl + yO_{2}

.

Accepted Answer

x = 2, y = 3

Answer

x = 2, y = 2

Answer

x = 1, y = 1

Answer

x = 3, y = 2

Question 8

What are the correct coefficients for the complete combustion of butane:

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

?

Accepted Answer

2, 13, 8, 10

Answer

1, 13, 4, 5

Answer

1, 6.5, 4, 5

Answer

2, 10, 8, 10

Question 9

What are the correct coefficients for the following double replacement reaction when it is balanced:

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

?

Accepted Answer

2, 1, 2, 1

Answer

1, 2, 1, 2

Answer

1, 1, 1, 1

Answer

2, 2, 2, 1

Question 10

In the chemical reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if you start with

O_{2}

moles of

xKClO_{3} \rightarrow 2KCl + yO_{2}

and

3.0

moles of

H_{2}

, which substance is the limiting reactant?

Accepted Answer

H_{2}

Answer

N_{2}

Answer

NH_{3}

Answer

Neither, they are in stoichiometric proportions

Question 11

In the reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if you have

O_{2}

moles of iron (

xKClO_{3} \rightarrow 2KCl + yO_{2}

) and

3.0

moles of oxygen gas (

H_{2}

), which substance is the limiting reactant?

Accepted Answer

Fe

Answer

Fe_{2}O_{3}

Answer

Neither, they are present in exact stoichiometric amounts

Answer

O_{2}

Question 12

For the reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if

O_{2}

moles of magnesium (

xKClO_{3} \rightarrow 2KCl + yO_{2}

) are reacted with

3.0

moles of hydrochloric acid (

H_{2}

), which reactant is the limiting reactant?

Accepted Answer

HCl

Answer

MgCl_{2}

Answer

H_{2}

Answer

Mg

Question 13

For the reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if

O_{2}

moles of aluminum (

xKClO_{3} \rightarrow 2KCl + yO_{2}

) react with

3.0

moles of chlorine gas (

H_{2}

), which is the limiting reactant?

Accepted Answer

Cl_{2}

Answer

Al

Answer

There is no limiting reactant

Answer

AlCl_{3}

Question 14

In the reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if you start with

O_{2}

moles of

xKClO_{3} \rightarrow 2KCl + yO_{2}

and

3.0

moles of

H_{2}

, which substance is the limiting reactant?

Accepted Answer

H_2

Answer

O_2

Answer

Neither, they are in stoichiometric proportions

Answer

H_2O

Question 15

For the reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if

O_{2}

moles of

xKClO_{3} \rightarrow 2KCl + yO_{2}

is reacted with

3.0

moles of

H_{2}

, which reactant is the limiting reactant?

Accepted Answer

HCl

Answer

MgCl_2

Answer

Mg

Answer

H_2

Question 16

In the reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if you have

O_{2}

moles of sulfur (

xKClO_{3} \rightarrow 2KCl + yO_{2}

) and

3.0

moles of oxygen gas (

H_{2}

), which substance is the limiting reactant?

Accepted Answer

O_2

Answer

SO_3

Answer

S_8

Answer

Both are present in equal stoichiometric amounts

Question 17

In the combustion of propane,

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if a mixture contains

O_{2}

moles of

xKClO_{3} \rightarrow 2KCl + yO_{2}

and

3.0

moles of

H_{2}

, which reactant is the limiting reactant?

Accepted Answer

O_2

Answer

CO_2

Answer

C_3H_8

Answer

H_2O

Question 18

Given the balanced equation

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if a reaction flask contains

O_{2}

moles of

xKClO_{3} \rightarrow 2KCl + yO_{2}

and

3.0

moles of

H_{2}

, which reactant is the limiting reactant?

Accepted Answer

O_2

Answer

CO_2

Answer

H_2O

Answer

CH_4

Question 19

In the reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if you combine

O_{2}

moles of

xKClO_{3} \rightarrow 2KCl + yO_{2}

and

3.0

moles of

H_{2}

, which reactant is the limiting reactant?

Accepted Answer

Al

Answer

Neither, they are in a perfect stoichiometric ratio

Answer

Cl_2

Answer

AlCl_3

Question 20

For the chemical reaction

Fe_{2}O_{3} + C \rightarrow Fe + CO_{2}

, if a container holds

O_{2}

moles of calcium (

xKClO_{3} \rightarrow 2KCl + yO_{2}

) and

3.0

moles of nitrogen gas (

H_{2}

), which reactant is the limiting reactant?

Accepted Answer

Ca

Answer

N_2

Answer

Ca_3N_2

Answer

Neither, they are in exact stoichiometric amounts

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