Characteristics of chemical reactions
Lesson 5 / 6
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Waxaan qeexi karaa qaar ka mid ah isbeddellada muujinaya in falcelin kiimikaad ay dhacayso.
Introduction
In this lesson: I can describe some of the changes that indicate a chemical reaction is taking place. Characteristics of chemical reactions include changes in colour, bubbling, or a change of temperature. Bubbles appear when a gas is produced in a chemical reaction.
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Quizzes
1. Which of the following is an example of a chemical change?
- Ice melting
- Water boiling
- Correct answer:Iron rusting
- Sugar dissolving
2. Which of the following represents a physical change?
- Burning wood
- Baking a cake
- Correct answer:Dissolving sugar in water
- Digesting food
3. What is the main difference between a physical change and a chemical change?
- Physical changes produce new substances, chemical changes do not.
- Correct answer:Chemical changes produce new substances, physical changes do not.
- Physical changes are irreversible, chemical changes are reversible.
- Chemical changes involve only a change in state.
1. What is a chemical reaction?
- A process where atoms remain unchanged
- Correct answer:A process where atoms are rearranged to form new substances
- A physical change
- A temporary change
2. Where are products found in a chemical equation?
- On the left-hand side
- Correct answer:On the right-hand side
3. What do bubbles indicate in a chemical reaction?
- A liquid is evaporating
- Correct answer:A gas is being produced
- A solid is dissolving
- A substance is melting
4. Which observation(s) always indicate a chemical reaction has taken place?
- Correct answer:Precipitation
- Dissolving
- Bubbling
- Melting
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The same lesson as a pupil sees it. You can set any section as work on its own.
- IntroductionPrepare
- Starter quizActivate · 3 questions
- Lesson videoLearn
- Exit quizCheck · 4 questions