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Science•Chemistry

States of matter

Junior High 7 questions
AI-drafted from platform data — specialist review scheduledBy DigiTransact Mastermind editorial teamLast updated
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What states of matter means

You learn how solids, liquids and gases behave, and how they change from one state to another. This helps you explain everyday events such as ice melting, water boiling and clothes drying.

What you will practise

  • Identify solids, liquids and gases from their properties
  • Match each state to particle arrangement and movement
  • Name changes such as melting, freezing and evaporation
  • Use simple examples from daily life to show state changes

Before you start

You should already know basic particle ideas and simple words for heat and temperature. It also helps if you can recognise common materials around you.

Worked example

One question from this skill's own question bank, shown with its full working.

Question

What is the process of a liquid turning into a gas called?

  • Freezing
  • Melting
  • Evaporation
  • Condensation
Answer: Evaporation

Working: Evaporation is when a liquid changes into a gas.

Common mistakes to avoid

  • Thinking all changes of state need only cooling. Some changes need heating, while others need cooling.
  • Mixing up melting and evaporation. Melting changes a solid to a liquid, while evaporation changes a liquid to a gas.
  • Saying gases are packed tightly like solids. Gas particles are far apart and move freely.
  • Forgetting that ice melts at 0°C at standard pressure. Learn this as a key reference point.

Curriculum and exam alignment

Ghana GES Basic 7 to 9 syllabusBECE

This topic normally appears in Junior High School Chemistry when learners study matter, particle ideas and physical changes. It supports preparation for BECE questions on states, properties and common changes of state.

Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.

Related skills

Other Chemistry skills in Science, at the same point in the course.

Other Science topics

My WorldLiving Things Around UsSHS SciencesUniversity ScienceBiologyPhysics

Related study guides

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Exams that assess states of matter

Junior High work on this skill feeds directly into these exam papers. Each page lists the Science topics that appear on it.

BECEBECE practice questionsFree BECE practice across the subjects at this stage, with worked answers.GESGES practice questionsFree GES practice across the subjects at this stage, with worked answers.

How this page was produced

This text was drafted with AI assistance from the questions and topics already stored on the platform. A subject-specialist review is scheduled but has not yet been recorded, so we do not claim it here.

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7 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.

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