7.2

Reactions of acids

10 flashcards to master Reactions of acids

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Key Concept Flip

Classify sulfur dioxide (SO₂) as acidic, basic, or amphoteric.

Answer Flip

Sulfur dioxide (SO₂) is classified as an acidic oxide due to its non-metallic character. Acidic oxides react with bases to form a salt and water.

Key Concept Flip

Classify copper(II) oxide (CuO) as acidic, basic, or amphoteric.

Answer Flip

Copper(II) oxide (CuO) is classified as a basic oxide due to its metallic character. Basic oxides react with acids to form a salt and water.

Definition Flip

What is the defining characteristic of an amphoteric oxide?

Answer Flip

Amphoteric oxides can react with both acids and bases to produce a salt and water. This dual reactivity distinguishes them from acidic or basic oxides.

Key Concept Flip

Name two amphoteric oxides.

Answer Flip

Aluminium oxide (Al₂O₃) and zinc oxide (ZnO) are examples of amphoteric oxides, which react with both acids and bases.

Key Concept Flip

Write a balanced chemical equation for the reaction of aluminium oxide (Al₂O₃) with hydrochloric acid (HCl).

Answer Flip

Al₂O₃(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H₂O(l). Note the state symbols (s - solid, aq - aqueous, l - liquid) are important.

Key Concept Flip

Write a balanced chemical equation for the reaction of aluminium oxide (Al₂O₃) with sodium hydroxide (NaOH).

Answer Flip

Al₂O₃(s) + 2NaOH(aq) + 3H₂O(l) → 2NaAl(OH)₄(aq). Note the state symbols (s - solid, aq - aqueous, l - liquid) are important.

Definition Flip

What are the state symbols used in chemical equations and what do they represent?

Answer Flip

The state symbols are (s) for solid, (aq) for aqueous (dissolved in water), (l) for liquid, and (g) for gas. These symbols indicate the physical state of each substance in the reaction.

Key Concept Flip

25.0 cm³ of 0.400 mol/dm³ hydrochloric acid reacts completely with a metal carbonate. Calculate the moles of HCl used.

Answer Flip

Moles of HCl = (Volume in dm³ x Concentration) = (25.0/1000) x 0.400 = 0.0100 mol. Remember to convert cm³ to dm³ by dividing by 1000.

Key Concept Flip

If 0.0100 mol of HCl reacts with a metal carbonate (MCO₃) according to the equation MCO₃ + 2HCl → MCl₂ + H₂O + CO₂, how many moles of CO₂ are produced?

Answer Flip

From the balanced equation, 2 moles of HCl produce 1 mole of CO₂. Therefore, moles of CO₂ = 0.0100 / 2 = 0.00500 mol.

Key Concept Flip

If 0.00500 mol of CO₂ is produced in a reaction, and the molar volume of a gas is 24000 cm³/mol, calculate the volume of CO₂ produced.

Answer Flip

Volume of CO₂ = (Moles of CO₂ x Molar Volume) = 0.00500 x 24000 = 120 cm³. Make sure units are consistent.

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7.1 Acids and bases 7.3 Preparation of salts

Key Questions: Reactions of acids

What is the defining characteristic of an amphoteric oxide?

Amphoteric oxides can react with both acids and bases to produce a salt and water. This dual reactivity distinguishes them from acidic or basic oxides.

What are the state symbols used in chemical equations and what do they represent?

The state symbols are (s) for solid, (aq) for aqueous (dissolved in water), (l) for liquid, and (g) for gas. These symbols indicate the physical state of each substance in the reaction.

About Reactions of acids (7.2)

These 10 flashcards cover everything you need to know about Reactions of acids for your Cambridge IGCSE Chemistry (0620) exam. Each card is designed based on the official syllabus requirements.

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