Polyatomic Ions and Potassium Chemistry

Polyatomic Ions and Potassium Chemistry

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Sophia Harris

FREE Resource

The video tutorial explains how to write the chemical formula for potassium dichromate. It begins by identifying the symbols for potassium and the dichromate ion, emphasizing the need to recognize polyatomic ions. The tutorial then discusses the charges of these ions and how to balance them to achieve a neutral compound. By adjusting the number of potassium ions, the tutorial demonstrates how to derive the correct formula, K2Cr2O7, ensuring the net charge is zero.

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6 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the symbol for potassium in the periodic table?

P

K

Po

Pt

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a polyatomic ion?

O2

Cr2O7

H2O

K

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the charge of the dichromate ion?

2+

1-

2-

1+

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Where can you find the charge of a polyatomic ion if you haven't memorized it?

By asking a friend

In a chemistry textbook

In a table of polyatomic ions

On the periodic table

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the charge of potassium in the periodic table?

1+

2-

2+

1-

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you balance the charges to form potassium dichromate?

Add more potassium atoms

Use two potassium ions for each dichromate ion

Add more dichromate ions

Use one potassium ion for each dichromate ion