Lesson T3.1.1
T3.1.1 Pure substances and identifying them Quiz: KS3 Chemistry, Unit 3
20 questions
In partnership with Revision Ninja
Lesson T3.1.1, Pure substances and identifying them: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 3: Pure and impure substances, written with Revision Ninja.
Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.
The 20 questions
-
What does a chemically pure substance contain?
- Only one substance
- Multiple elements
- Various molecules
- Two dissolved solids
-
What physical property is used to identify a pure substance?
- Melting point
- Solubility
- Colour
- Density
-
What does a sharp boiling point of exactly 100 °C indicate about water?
- It contains salt
- It is impure
- It is a mixture
- It is pure
-
Why do impure substances melt over a range of temperatures?
- Different components melt separately
- Pressure changes constantly
- Heat is applied slowly
- Particles stop moving
-
Which test best shows that a water sample is pure?
- Filtration paper test
- Fixed melting point
- Electrical conductivity test
- Universal indicator colour
-
What is a sample melting sharply at 0 °C and boiling at 100 °C?
- Seawater
- Pure water
- Mineral water
- Tap water
-
Which of these substances is chemically pure?
- Mineral water
- Distilled water
- Tap water
- Seawater
-
Which of these is a pure substance that is a compound?
- Pure copper
- Pure iron
- Pure water
- Pure oxygen gas
-
What does melting over a temperature range from 40 °C to 50 °C suggest?
- Sample is an element
- Sample is pure
- Sample is water
- Sample is impure
-
What does a pure element contain?
- Mixed molecules
- Bonded compounds
- Two atom types
- One atom type
-
Why is a sharp melting point useful to scientists?
- Increases mass
- Changes colour
- Identifies the substance
- Speeds up reactions
-
Which of these is classified as an impure substance?
- Distilled water
- Gold foil
- Oxygen gas
- Tap water
-
What does a sharp, single boiling point indicate about a substance?
- It is pure
- It is a mixture
- It is acidic
- It is an element
-
What property of a melting point indicates a pure substance?
- Wide range
- Variable rate
- Gradual increase
- Constant temperature
-
What describes a substance containing unbonded parts?
- A mixture
- A compound
- A pure element
- An atom
-
Which boiling point feature shows that a liquid sample is impure?
- Fixed temperature
- Exact value
- Sharp point
- Boiling range
-
What is an unwanted substance mixed into a chemical sample called?
- An impurity
- A solute
- An element
- A solvent
-
What test result proves a labelled gold sample is actually impure?
- Wide melting range
- High density
- Metallic lustre
- Fixed melting point
-
What physical property is characteristic of any pure chemical substance?
- Melting range
- Changing density
- Fixed melting point
- Variable boiling point
-
Which compound is also classified as a pure substance?
- Mineral water
- Pure water
- Sea water
- Tap water
Related quizzes
- Mixtures and dissolving Quiz · T3.1.2 · 20 questions
- Diffusion and the particle model Quiz · T3.1.3 · 20 questions
- Filtration and evaporation Quiz · T3.2.1 · 20 questions
- Distillation and chromatography Quiz · T3.2.2 · 20 questions
- Solids, liquids and gases Quiz · T1.1.1 · 20 questions
- The carbon cycle Quiz · T10.1.1 · 20 questions
- Dalton atomic model Quiz · T2.1.1 · 20 questions
- Rearranging atoms in reactions Quiz · T4.1.1 · 20 questions
- Acids, alkalis and neutralisation Quiz · T5.1.1 · 20 questions
- Energy changes on changes of state Quiz · T6.1.1 · 20 questions