Chemical Reactions & Equations - Review

What Makes an Equation Improper?

1 pts

volume_mute

Why is 4Na(s) + 2Cl₂(g) → 4NaCl(s) not considered a proper chemical equation?

It is not balanced for sodium.

It is missing the required phase labels.

The coefficients are not in the lowest whole-number ratio.

Chlorine should not be written as a diatomic molecule.

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Explanation

Will the Reaction Proceed?

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Does 3Zn(s) + 2Al(NO₃)₃(aq) → 3Zn(NO₃)₂(aq) + 2Al(s) proceed as written?

No - zinc is below aluminum in the activity series.

Yes - it is a combustion reaction.

No - the equation is not balanced.

Yes - zinc readily displaces aluminum.

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Find the Error

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What is wrong with the proposed reaction NaCl(aq) + KBr(aq) → NaK(aq) + ClBr(aq)?

The equation is not balanced.

Bromine must be written as a diatomic molecule.

The cations are paired with each other and the anions are paired with each other.

NaCl is insoluble in water.

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Reactions That Overlap with Redox

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volume_mute

Select every statement that is TRUE.

A combustion reaction can also be a redox reaction.

A double-replacement reaction is always a redox reaction.

A decomposition reaction can also be a redox reaction.

A composition reaction can also be a redox reaction.

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Explanation

Oxidation Numbers of Nitrogen

4 pts

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Drag the correct oxidation number of nitrogen into each blank:
N₂ = (1) NH₃ = (2) NO = (3) N₂O₅ = (4)

Please drag and drop the selected option in the right place or type it instead

+1

+5

+4

-3

+2

0

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Explanation

Disproportionation

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volume_mute

In 2CuCl(aq) → CuCl₂(aq) + Cu(s), copper disproportionates. What are copper's initial and final oxidation numbers?

From +2 to both +1 and 0.

From +1 to both +2 and −1.

From +1 to both +2 and 0.

From 0 to both +1 and +2.

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Name That Reaction Type

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To complete the line match

Click on an item in the first group
Click on an item in the second group
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Reaction

H₂ + Cl₂ → 2HCl

2HCl → H₂ + Cl₂

C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O

NaCl(aq) + KBr(aq) → NaBr(aq) + KCl(aq)

Type

Decomposition

Composition

Combustion

Double-replacement

Match each reaction to the category that best describes it.

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Why Isn't It an Acid?

1 pts

volume_mute

Why is CH₄ not normally considered an acid?

It does not increase the H⁺ concentration in solution.

It contains no hydrogen atoms.

It reacts only with oxygen.

It is insoluble and cannot react.

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What Makes an Equation Improper?

Correct Answer

Explanation

Will the Reaction Proceed?

Correct Answer

Explanation

Find the Error

Correct Answer

Explanation

Reactions That Overlap with Redox

Correct Answer

Explanation

Oxidation Numbers of Nitrogen

Correct Answer

Explanation

Disproportionation

Correct Answer

Explanation

Name That Reaction Type

Reaction

Type

Correct Answer

Explanation

Why Isn't It an Acid?

Correct Answer

Explanation

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