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Chemistry: Naming Ions and Polyatomic Ions

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Questions and Answers

How many chloride ions are present for each magnesium ion in magnesium chloride?

3
1
4
2 (correct)

Which of the following is an example of a polyatomic ion?

Magnesium (Mg2+)
Ammonium (NH4+) (correct)
Chloride (Cl-)
Sulphide (S2-)

In writing the chemical formula for an ionic compound, what is the correct order in which the symbols of cation and anion should be written?

Cation symbol twice followed by anion symbol
Anion symbol twice followed by cation symbol
Anion symbol first followed by cation symbol
Cation symbol first followed by anion symbol (correct)

What is the valency of potassium based on the information provided in Table 3.6?

1 (C) Signup and view all the answers

In the compound calcium oxide, what is the ratio by mass of calcium to oxygen?

5:2 (D) Signup and view all the answers

If a compound has a valency of 2 and combines with an ion having a valency of 1, what is the chemical formula of this compound according to the principles discussed in the text?

AB2 (A) Signup and view all the answers

What is the main difference between a mixture and a compound?

A mixture shows the properties of the constituent substances, while a compound has new properties. (C) Signup and view all the answers

Why do elements react to form new compounds?

To achieve a stable electron configuration (C) Signup and view all the answers

When an element reacts with another element to form a compound, what is the significance of the valency?

Valency indicates the number of atoms of an element that can combine with one atom of another element (A) Signup and view all the answers

What is the role of ionic compounds in the formation of polyatomic ions?

Ionic compounds stabilize polyatomic ions (A) Signup and view all the answers

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