Lesson Review: Oxides

Oxides

Lesson Review Grade 11

Types of Oxides

Acidic

Basic

Amphoteric

Neutral

4 main types of oxides

• Acidic oxides are formed when a non-metal element combines with oxygen

• They react with bases to form a salt and water

• When dissolved in water they produce an acidic solution with a low pH

• Common examples include CO₂, SO_2, NO₂ and SiO₂

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Acidic Oxides

Neutral Oxides

• Some oxides do not react with either acids or bases and thus are said to be neutral

• these are also derived from non-metals

• Examples include N₂O, NO and CO

**Neutral Oxides must be memorized**

• Basic oxides are formed when a metal element combines with oxygen

• They react with acids to form a salt and water

• When dissolved in water they produce a basic solution with a high pH

• Common examples include Na₂O, KOH and CaO

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​Basic Oxides

Amphoteric Oxides

• These are also derived from metals

• Amphoteric oxides and their hydroxides can behave as both acidic and basic, depending on whether the other reactant is an acid or a base

• In both cases a salt and water is formed

• Example of aluminium oxide behaving as a base:

Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O

• Example for an aluminium oxide behaving as an acid:

Al₂O₃ + 2NaOH → 2NaAlO₂ + H₂O

**Amphoteric Oxides must be memorized**

Let's Practice!

Answer the questions that follow by applying your knowledge of oxides.

Questions in green have multiple correct answers

Multiple Choice

Al₂O₃ is classified as a ......................... oxide

• Acidic oxide

• Basic oxide

• Amphoteric oxides

• Neutral oxides

Multiple Choice

When CO₂ is dissolves in water, the litmus solution turns .................. in the produced solution

• Purple

• green

• red

• blue

Multiple Choice

Na₂O is an example of a ...........................

• Acidic oxide

• Basic oxide

• Neutral oxide

• Amphoteric oxid

Multiple Choice

........................react with oxygen to form basic oxides

• Metals

• Non-metals

• metalloid

Multiple Select

Select the statements that are true of basic oxides.

• They are oxides of metals.

• They dissolve in water to form acids.

• They react with acids to form salt and water.

• They react with bases to form salts and water.

Multiple Select

Select the amphoteric oxides.

• aluminium oxide

• carbon dioxide

• lead(II) oxide

• potassium oxide

• zinc oxide

Multiple Choice

Metal oxides are basic because .....

• they form alkaline solutions

• they form acidic solutions

• they are simple

• they are dull

Multiple Choice

Iron oxide and hydrochloric acid react together and universal indicator is added to the solution what colour would it go?

• orange

• red

• green

• purple

Multiple Choice

What type of oxide is:

Water

• Amphoteric Oxide

• Basic Oxide

• Neutral Oxide

• Acidic Oxide

Multiple Choice

What type of oxide is:

Nitrogen Dioxide

• Amphoteric Oxide

• Basic Oxide

• Neutral Oxide

• Acidic Oxide

Multiple Choice

What type of oxide is:

Carbon monoxide

• Amphoteric Oxide

• Basic Oxide

• Neutral Oxide

• Acidic Oxide

Multiple Choice

What type of oxide is:

Zinc (II) oxide

• Amphoteric Oxide

• Basic Oxide

• Neutral Oxide

• Acidic Oxide

Multiple Select

Select the statements that are true of amphoteric oxides.

• They are mostly insoluble in water.

• They do not react with acids and alkalis.

• They react with acids to form salt and water.

• They react with akalis for form salt and water.

Multiple Choice

When in solution metal oxides give a pH of .....

• 0-6

• 8-14

• 3-9

• 7

Multiple Choice

What type of oxide is:

Carbon Dioxide

• Amphoteric Oxide

• Basic Oxide

• Neutral Oxide

• Acidic Oxide

Multiple Choice

What is the test to prove the presence of oxygen?

• Add a lit splint and it relights

• Add a lit splint and it burns with a pop

• Add a glowing splint and it relights

• Add a glowing splint and it burns with a pop

Multiple Select

A basic oxide reacts with an acid to give

• salt

• carbon dioxide

• water

• hydrogen

Multiple Choice

Which type of oxides cannot react with acid or base?

• acidic

• amphoteric

• basic

• neutral

Multiple Choice

Which oxide is P₄O₁₀?

• Basic

• Amphoteric

• Acidic

• Neutral

Multiple Choice

Amphoteric oxides are substances that

• Reacts with acids only

• Reacts with bases only

• Reacts with acids and bases

• Do not react with acids or bases