Lesson T6.1.1
T6.1.1 Conservation of mass in physical changes Quiz: KS3 Physics, Unit 6
20 questions
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Lesson T6.1.1, Conservation of mass in physical changes: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 6: Matter and particles, written with Revision Ninja.
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The 20 questions
-
What happens to total mass during a physical change?
- Always decreases
- Disappears completely
- Stays the same
- Always increases
-
Which of these is a physical change?
- Melting ice
- Frying an egg
- Burning wood
- Rusting iron
-
When 20 g of ice melts in a sealed bag, what is the mass of the water produced?
- 0 g
- 25 g
- 10 g
- 20 g
-
Why does an open bowl of evaporating water lose mass?
- Gravity decreases
- Atoms shrink
- Water is destroyed
- Vapour escapes
-
When 50 g of salt dissolves completely in 200 g of water, what is the total mass of the solution?
- 200 g
- 150 g
- 50 g
- 250 g
-
Which of these is a chemical change?
- Boiling water
- Burning paper
- Dissolving salt
- Melting wax
-
Which process turns a solid straight into a gas without becoming a liquid?
- Sublimation
- Dissolving
- Condensation
- Freezing
-
Which change of state is caused by cooling a gas?
- Boiling
- Condensation
- Sublimation
- Evaporation
-
What defines a physical change?
- Chemical bonds form
- Mass is destroyed
- Atoms are created
- No new substances made
-
A student freezes water then melts it. What is true about the mass?
- Mass increases
- Mass becomes zero
- Mass remains constant
- Mass decreases
-
What happens to the mass of a solid when it dissolves?
- Mass decreases
- Mass increases
- Mass is conserved
- Mass vanishes
-
A candle melts and solidifies again. What type of change is this?
- Reversible physical change
- Thermal destruction
- Irreversible chemical change
- Nuclear reaction
-
If 30 g of a solid melts into a liquid, what is its mass?
- 30 g
- 15 g
- 60 g
- 0 g
-
Why is the mass of a heated gas in a sealed container constant?
- Density increases
- Matter is destroyed
- Energy is created
- Mass is conserved
-
Which process is an easily reversible physical change?
- Burning wood
- Melting ice
- Rusting iron
- Cooking eggs
-
What does measuring the mass of sugar water prove?
- Mass is conserved
- Water is created
- Volume decreases
- Sugar is destroyed
-
What does the particle model explain about changes of state?
- Particles grow larger
- Atoms break apart
- Particles change mass
- Particle arrangement changes
-
What stays the same when a substance condenses?
- Total mass
- Total volume
- Temperature
- Particle speed
-
A metal block is cut into pieces. What is their total mass?
- The same
- Slightly lighter
- Much heavier
- Zero
-
Which process is a physical change in which a liquid turns into a gas at its surface at any temperature?
- Electrolysis
- Combustion
- Oxidation
- Evaporation
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