Chemical ChangesLow Exam FrequencyAQA

Acids and Alkalis

Revise Acids and Alkalis in Chemical Changes for GCSE Chemistry with 25 exam-style questions and 21 flashcards. This topic appears less often, but it can still pick up marks when it appears in mixed-topic papers.

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The Chemistry of Lemons and Soap

Introduction 2

Deep Dive: What Actually Makes an Acid?

Deep Dive 3

The pH Scale

Diagram 4

How It Works: H⁺ Ions Make Solutions Acidic, OH⁻ Make Them Alkaline

How It Works 5

Higher Tier: Strong vs Weak Acids

Higher Tier 6

Key Definitions

Definitions 7

Key Facts: Acids, Alkalis and Indicators

Key Facts 8

Common Misconceptions

Misconceptions 9

Memory Aids

Memory Aid 10

Exam Focus

Exam Focus 11

Exam Tips for Acids and Alkalis

Exam Tips 12

Knowledge Organiser: Acids and Alkalis

Summary

Sample Flashcards

Name two common alkalis

Sodium hydroxide (NaOH), Potassium hydroxide (KOH)

What is universal indicator?

An indicator that shows a range of colours across the pH scale (rainbow of colours from red to purple)

Exam questions for Acids and Alkalis

Which ion do acids produce when dissolved in water?

A. Hydroxide ions (OH⁻)
B. Oxide ions (O²⁻)
C. Hydrogen ions (H⁺)
D. Sodium ions (Na⁺)

1 markfoundation

Explain the difference between a strong acid and a concentrated acid.

2 marksstandard

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