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Halogens and Oxidation Numbers

Halogens and Oxidation Numbers

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Liam Anderson

FREE Resource

This video tutorial explains how to determine the oxidation numbers for each element in hydrochloric acid (HCl). It covers the general rules for assigning oxidation numbers, focusing on hydrogen and chlorine. Hydrogen, when bonded to a non-metal like chlorine, has an oxidation number of +1. The video also explains that the sum of oxidation numbers in a neutral molecule like HCl must equal zero. Chlorine, being a halogen, typically has an oxidation number of -1 unless bonded to more electronegative elements like oxygen or fluorine. The tutorial concludes by summarizing these concepts and confirming the oxidation numbers for HCl.

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6 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the oxidation number of hydrogen when it is bonded to a non-metal?

0

-1

+2

+1

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why do the oxidation numbers in HCl add up to zero?

Because HCl is a gas

Because HCl is a metal

Because HCl is a neutral molecule

Because HCl is an ion

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the oxidation number of chlorine in HCl?

0

-1

+1

+2

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Under what condition does chlorine not have an oxidation number of -1?

When in a solid state

When in a gaseous state

When bonded to oxygen or fluorine

When bonded to hydrogen

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which group do halogens belong to in the periodic table?

Group 1

Group 2

Group 8

Group 7A or 17

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the general rule for the oxidation number of halogens?

Always +2

Usually -1 unless bonded to more electronegative elements

Always 0

Always +1

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