Oxidation Numbers and Carbonate Ions

Oxidation Numbers and Carbonate Ions

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Aiden Montgomery

FREE Resource

This video tutorial explains how to determine the oxidation numbers for iron(III) carbonate (Fe2(CO3)3). It begins by introducing the compound as neutral, meaning the oxidation numbers must sum to zero. The video then discusses the oxidation states of iron and the carbonate ion, which is a polyatomic ion with a known charge of 2-. The tutorial demonstrates how to calculate the oxidation numbers for iron using both a direct calculation and an algebraic method, concluding that the oxidation number for iron in this compound is +3.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the oxidation number of iron in Fe2(CO3)3?

+2

+3

+6

+4

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why must the oxidation numbers in a neutral compound add up to zero?

To balance the charges within the compound

To ensure the compound is stable

Because it is a rule for all compounds

To make the compound reactive

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the charge of the carbonate ion (CO3)?

-1

+2

-2

-3

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do oxidation numbers relate to the charge of an ion?

They are always positive

They add up to the charge of the ion

They are always equal

They are always negative

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the total oxidation number for three carbonate ions in Fe2(CO3)3?

-2

-8

-4

-6

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What must be the total positive oxidation number to balance the negative charge of the carbonate ions?

+2

+6

+4

+3

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the algebraic method, what does 'x' represent?

The total charge of the compound

The number of iron atoms

The charge of the carbonate ion

The oxidation number of iron

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