Properties of elements
Lesson 4 / 9
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Waxaan sharxi karaa sifooyinka kiimikada iyo jirka ee curiyeyaasha kala duwan.
Introduction
In this lesson: I can describe the chemical and physical properties of different chemical elements. Elements are chemically pure, but can react together. Each element has a fixed melting point and boiling point.
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Quizzes
1. In chemistry, what does it mean if a substance is described as 'pure'?
- It is clean and safe to use.
- Correct answer:It contains only one chemical substance.
- It is natural and not man-made.
- It has been filtered.
2. Which statements explain why elements are considered to be pure substances?
- They are always safe to handle.
- Correct answer:They are made of only one type of atom.
- They are found in nature.
- Correct answer:They cannot be physically separated into other substances.
3. Which properties would be essential for making a saucepan?
- shiny
- Correct answer:good conductor of heat
- Correct answer:lightweight
- brittle
- Correct answer:high melting point
1. Why do elements have fixed melting and boiling points?
- They change colour at certain temperatures.
- Correct answer:They are pure substances.
- They react chemically at these temperatures.
- They dissolve at these temperatures.
2. Which of the following are physical properties of an element?
- Correct answer:colour
- reactivity with acid
- Correct answer:acidity
- boiling point
- reactivity with water
3. Which of the following is **not** a physical property of an element?
- density
- melting point
- hardness
- shininess
- Correct answer:flammability
4. True or false? In chemical reactions, new substances are always formed.
- Correct answer:True
- False
What pupils see
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