P5 Science CA2 2023 — Nanyang

Study the diagram below. A, B, C and D represent processes that result in changes in the state of water. What processes do C and D represent?

Which one of the following statements is true?

Three children made the following statements about the importance of water to living things. Bill: Water is needed for plants to make food. Chloe: Water is not needed for seeds to germinate. Gerald: Water is not needed for organ systems to work properly. Who has made the incorrect statement(s)?

Jolin conducted an experiment to find out which container allows water to evaporate faster. She poured 250ml of water each into containers G, H and I as shown in the diagram below. The containers were placed next to a window and she measured the amount of water left every minute until all the water had evaporated completely. Which one of the following graphs shows the most likely results in containers G, H and I?

Which of the following activities do/does not help to conserve water? A Fixing a leaky water pipe. B Collecting rainwater to water the plants. C Washing a car with a water hose instead of a pail. D Using a mug of water to rinse after brushing teeth instead of a running tap.

Water is a valuable and important resource to living things. However, some of man's activities can release harmful substances into the water to cause water pollution. Which of the following activities could cause water pollution? A Oil spills from ships B Treatment of waste water C Throwing rubbish into drains D Factories releasing waste into lakes

Oliver wanted to make ice dessert at home. He prepared some flavoured water and poured them into a small plastic bag. The small plastic bag was then placed into a big plastic bag containing ice cubes. Both plastic bags were sealed. The diagram below shows the observations of the set-up before and after process Z had taken place. (a) Explain how the liquid flavoured water turned into ice dessert in the solid state. [2] (b) Oliver observed water droplets on the outer surface of the ice cream display freezer as shown below. Explain how the water droplets were formed. [2]

The diagram below shows the changes in state of water during the water cycle. (a) Identify processes P & Q. [1] P: ____ Q: ____ (b) Put a tick (✓) in the correct box below to show the transfer of heat for each of the following: [1] Matter | Heat gain | Heat loss — Water on Earth during process P; Water vapour in the air during process Q. (c) Li Ming conducted an experiment with identical containers and beakers. Both containers contained the same amount of water at different temperatures as shown below. Both set-ups were left under the sun outdoors. Explain why there was more water collected in the beaker in set-up X. [2]