Electronegativity and Ionic Compounds

Electronegativity and Ionic Compounds

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Lucas Foster

FREE Resource

The video explores whether zinc chloride (ZnCl2) is ionic or covalent. Initially, it is suggested that ZnCl2 is ionic due to zinc being a metal and chlorine a nonmetal. However, the electronegativity difference between zinc and chlorine is 1.51, which is below the typical threshold for ionic compounds. This suggests ZnCl2 is weakly ionic. Laboratory data shows ZnCl2 melts easily, indicating more covalent character. The video concludes that ZnCl2 lies on a continuum between ionic and covalent compounds, leaning towards weakly ionic.

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9 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main focus of the video regarding zinc chloride?

Its environmental impact

Its color and texture

Its classification as ionic or covalent

Its uses in industry

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of elements are zinc and chlorine?

Both are metals

Both are nonmetals

Zinc is a nonmetal and chlorine is a metal

Zinc is a metal and chlorine is a nonmetal

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the electronegativity value of zinc?

1.65

3.16

2.55

0.98

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the electronegativity difference between zinc and chlorine calculated?

By subtracting zinc's value from chlorine's

By multiplying their values

By dividing chlorine's value by zinc's

By adding their values

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the general electronegativity difference threshold for a compound to be considered ionic?

Greater than 2.0

Greater than 1.5

Greater than 3.0

Greater than 1.0

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is zinc chloride classified based on its electronegativity difference?

Strongly ionic

Metallic

Weakly ionic

Purely covalent

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What laboratory observation supports the covalent character of zinc chloride?

It is colorless

It melts easily compared to sodium chloride

It is highly reactive with water

It has a high boiling point

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