Iron III Dichromate Concepts

Iron III Dichromate Concepts

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Mia Campbell

FREE Resource

The video tutorial explains how to write the formula for Iron(III) Dichromate. It begins by identifying the element symbol for iron and the significance of the Roman numeral III, indicating a 3+ charge. The dichromate ion is introduced as a polyatomic ion with a formula of Cr2O7 and a 2- charge. The tutorial emphasizes the need to balance these charges to achieve a net charge of zero, using a trick to swap and balance the charges. The final formula for Iron(III) Dichromate is derived as Fe2(Cr2O7)3, with an explanation of the need for parentheses around the dichromate ion. The video concludes with a summary of the process.

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7 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the element symbol for iron in the formula for Iron III Dichromate?

I

Ir

Fe

In

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the charge of iron in Iron III Dichromate?

1+

2+

3+

4+

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formula for the dichromate ion?

Cr2O7

CrO7

CrO4

Cr2O4

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the charge of the dichromate ion?

1-

4-

2-

3-

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why do the charges in an ionic compound need to add up to zero?

To make the compound dissolve in water

To make the compound colorful

To make the compound stable

To make the compound magnetic

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of using parentheses in the formula for Iron III Dichromate?

To indicate the number of dichromate ions

To indicate the color of the compound

To indicate the number of iron atoms

To indicate the charge of the compound

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the complete formula for Iron III Dichromate?

Fe2(Cr2O7)3

FeCr2O7

Fe(Cr2O7)2

Fe3(Cr2O7)2