BECE (Ghana) Changes of State — practice questions

Explore 3 free Changes of State questions in BECE (Ghana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Changes of State questions and exercises with answers

Showing questions 1–3 of 3.

What is one clear difference between evaporation and boiling?Read the answer and worked solution →Drops of water appear on the outside of a cold glass. What has the water vapour in the air done?Read the answer and worked solution →Order the stages of heating a solidRead the answer and worked solution →

Worked practice questions

What is one clear difference between evaporation and boiling?

Evaporation happens at any temperature
Evaporation happens only in cold places
Evaporation happens without any energy
Evaporation happens deep inside a liquid

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Correct answer: A. Evaporation happens at any temperature

1. Boiling starts only once a liquid reaches one particular temperature. 2. Evaporation goes on at all temperatures, which is why wet clothes dry in the shade. 3. Evaporation also happens only at the surface, while boiling happens right through. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Melting and evaporation_

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Drops of water appear on the outside of a cold glass. What has the water vapour in the air done?

It has warmed and turned into a liquid
It has cooled and turned into a liquid
It has cooled and turned into a solid
It has warmed and turned into a gas

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Correct answer: B. It has cooled and turned into a liquid

1. The air around the glass carries invisible water vapour. 2. The cold glass takes energy away from the vapour particles touching it. 3. With less energy those particles slow down. 4. Slower particles feel the forces of attraction between them and pull together. 5. They join into tiny droplets of liquid water, and this change is condensation. 6. Warming would do the opposite and keep the water as vapour. 7. Turning into a solid would need cooling much further, all the way to freezing. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Condensation and solidifying_

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Order the stages of heating a solid

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Steps

Particles vibrate
Vibration grows
The solid melts
The liquid heats
The liquid boils

Instructions

Tap the five stages in order, from a cold solid to a spreading gas, as energy is added.

_Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), Melting and evaporation_

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