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Chemical Compounds and Prefixes

Chemical Compounds and Prefixes

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Liam Anderson

FREE Resource

The video tutorial explains how to write the chemical formula for phosphorus pentachloride (PCl5). It begins by identifying phosphorus and chlorine as nonmetals, classifying the compound as molecular. The tutorial then details writing the element symbols and determining subscripts based on prefixes, specifically highlighting the prefix 'penta' for five chlorines. The final formula, PCl5, is presented, along with tips for memorizing prefixes.

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8 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of elements are phosphorus and chlorine?

Metals

Nonmetals

Noble gases

Metalloids

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What kind of compound is phosphorus pentachloride?

Ionic compound

Molecular compound

Metallic compound

Alloy

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the element symbol for phosphorus?

Ph

P

Ps

Po

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the prefix 'penta' indicate in chemical formulas?

Four

Three

Five

Two

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many chlorine atoms are in phosphorus pentachloride?

One

Seven

Three

Five

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the correct formula for phosphorus pentachloride?

PCl4

PCl5

PCl6

PCl3

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a useful tool for memorizing chemical prefixes?

Prefix table

Periodic table

Element list

Molecular chart

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