Podcast
Questions and Answers
Which of these is a reversible change?
Which of these is a reversible change?
- Melting ice (correct)
- Cooking an egg
- Rusting iron
- Burning paper
Which change cannot be undone?
Which change cannot be undone?
- Burning wood (correct)
- Freezing juice
- Tearing paper
- Boiling water
What happens when water evaporates?
What happens when water evaporates?
- It turns into ice
- It turns into gas (correct)
- It disappears
- It turns into solid
Which of these methods can separate sand from water?
Which of these methods can separate sand from water?
Which of these substances is soluble in water?
Which of these substances is soluble in water?
What is the solvent in a sugar-water solution?
What is the solvent in a sugar-water solution?
Which of the following is an irreversible change?
Which of the following is an irreversible change?
Which process is used to obtain salt from seawater?
Which process is used to obtain salt from seawater?
What is condensation?
What is condensation?
What happens when a candle burns?
What happens when a candle burns?
Why is cutting paper a reversible change?
Why is cutting paper a reversible change?
Which process is involved in drying clothes in the sun?
Which process is involved in drying clothes in the sun?
What happens to water when it is frozen?
What happens to water when it is frozen?
What kind of change occurs when vinegar reacts with baking soda?
What kind of change occurs when vinegar reacts with baking soda?
Which of these is an example of a physical change?
Which of these is an example of a physical change?
Which process changes liquid water into steam?
Which process changes liquid water into steam?
What type of change is involved in making glass from sand?
What type of change is involved in making glass from sand?
Which change occurs when an iron nail rusts?
Which change occurs when an iron nail rusts?
Which change happens when ice cream melts?
Which change happens when ice cream melts?
Which is an example of an irreversible change?
Which is an example of an irreversible change?
Which of the following involves a change of state?
Which of the following involves a change of state?
Why is burning wood an irreversible change?
Why is burning wood an irreversible change?
What happens to a solid when it melts?
What happens to a solid when it melts?
Which of these changes is temporary and reversible?
Which of these changes is temporary and reversible?
What force pulls objects toward Earth?
What force pulls objects toward Earth?
Which force slows down a moving car?
Which force slows down a moving car?
Which of these is an example of a push force?
Which of these is an example of a push force?
Which of these is a pull force?
Which of these is a pull force?
Why do bicycles have rubber tires?
Why do bicycles have rubber tires?
Why do astronauts float in space?
Why do astronauts float in space?
What force helps boats move smoothly through water?
What force helps boats move smoothly through water?
What shape helps reduce water resistance?
What shape helps reduce water resistance?
What helps reduce air resistance in racing cars?
What helps reduce air resistance in racing cars?
Why do parachutes slow down a skydiver?
Why do parachutes slow down a skydiver?
What happens when two forces acting on an object are equal and opposite?
What happens when two forces acting on an object are equal and opposite?
Which force is used when rubbing hands together?
Which force is used when rubbing hands together?
Which is an example of reducing friction?
Which is an example of reducing friction?
Which force keeps the planets in orbit around the Sun?
Which force keeps the planets in orbit around the Sun?
Which force allows a magnet to attract metal objects?
Which force allows a magnet to attract metal objects?
Which of the following objects will experience air resistance?
Which of the following objects will experience air resistance?
Why do cyclists wear tight clothing while racing?
Why do cyclists wear tight clothing while racing?
Which of these objects has the most friction when moving?
Which of these objects has the most friction when moving?
What happens to a moving object when friction is removed?
What happens to a moving object when friction is removed?
Which force makes it difficult to ride a bicycle on sand?
Which force makes it difficult to ride a bicycle on sand?
Why do athletes wear special shoes for running?
Why do athletes wear special shoes for running?
Which of these activities involves both push and pull forces?
Which of these activities involves both push and pull forces?
What force pulls rain down from clouds?
What force pulls rain down from clouds?
What happens when an object is thrown up in the air?
What happens when an object is thrown up in the air?
Which is an example of increasing friction?
Which is an example of increasing friction?
Flashcards
What is a reversible change?
What is a reversible change?
A change that can be reversed (returned to its original state).
What is an irreversible change?
What is an irreversible change?
A change that cannot be reversed; a new substance is formed.
What is evaporation?
What is evaporation?
The process where a liquid turns into a gas.
What is filtration?
What is filtration?
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What is a solvent?
What is a solvent?
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What is condensation?
What is condensation?
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What is Friction?
What is Friction?
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What is Gravity?
What is Gravity?
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What is 'Streamlined' Shape?
What is 'Streamlined' Shape?
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Why do cyclists wear tight clothing?
Why do cyclists wear tight clothing?
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Study Notes
- Melting ice is a reversible change.
- Burning wood is a change that cannot be undone.
- When water evaporates, it turns into gas.
- Filtration is a method that can separate sand from water.
- Salt is an example of a substance that is soluble in water.
- Water is the solvent in a sugar-water solution.
- Baking a cake is an irreversible change.
- Evaporation is used to obtain salt from seawater.
- Condensation is a gas changing into a liquid.
- When a candle burns, the wax turns into gas and smoke.
- Cutting paper is a reversible change because the paper does not change its material.
- Evaporation is involved in drying clothes in the sun.
- When water is frozen, it changes into ice.
- A chemical change occurs when vinegar reacts with baking soda.
- Melting wax is an example of a physical change.
- Boiling changes liquid water into steam.
- Making glass from sand involves a chemical change.
- When an iron nail rusts, a chemical change occurs.
- When ice cream melts, it is a reversible change.
- Burning paper is an example of an irreversible change.
- Dissolving sugar in water is a reversible change.
- Melting ice involves a change of state.
- Burning wood is irreversible because it turns into gas and ash.
- When a solid melts, it turns into a liquid.
- Melting butter is a temporary and reversible change.
- Gravity is the force that pulls objects towards Earth.
- Friction is the force that slows down a moving car.
- Kicking a ball is an example of a push force.
- Dragging a suitcase involves a pull force.
- Bicycles have rubber tires to increase friction.
- Astronauts float in space because gravity is weaker in space.
- Water resistance helps boats move smoothly through water.
- A streamlined shape helps reduce water resistance.
- A streamlined shape helps reduce air resistance in racing cars.
- Parachutes increase air resistance to slow down a skydiver.
- When two forces acting on an object are equal and opposite, the object stops moving.
- Friction is the force used when rubbing hands together.
- Using oil on a machine is an example of reducing friction.
- Gravity keeps the planets in orbit around the Sun.
- Magnetism allows a magnet to attract metal objects.
- A falling feather will experience air resistance.
- Cyclists wear tight clothing while racing to reduce air resistance.
- A rough gravel road has the most friction when moving.
- When friction is removed from a moving object it keeps moving at the same speed.
- Friction makes it difficult to ride a bicycle on sand.
- Athletes wear special shoes for running to increase friction.
- Playing tug-of-war involves both push and pull forces.
- Gravity pulls rain down from clouds.
- When an object is thrown up in the air, it stops and falls back down.
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