Marshall Cavendish Cambridge Primary Science (2nd edition) Stage 4 Homework worksheet (The following content has not been through the Cambridge Assessment International Education endorsement process.) Chapter 5: Materials, Substances and Particles Worksheet 1 (Particle Model and Properties) 1. Complete the table. Use the following words. ice milk orange juice rock Solids sand water Liquids 2. Which of these sentences is/are correct? Tick (√) the correct box beside each sentence. True Materials can be solids only. Materials are made up of particles. False 3. Complete the sentences. Use the following words. material particles substance A _______________ is made of one type of matter. A _______________ can be made of one or more substances. All matter is made up of _______________. © 2022 Marshall Cavendish Education Pte Ltd 4. Aini notices that sand behaves like a liquid. It takes the shape of the container that it is poured into. Aini draws the particle model below to show the particles in sand. Is Aini correct? Explain. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 5. The diagram shows the particle model of a substance. (a) What is the state of the substance? __________________________________________________________ (b) Describe the way the particles are arranged and how they move. __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ © 2022 Marshall Cavendish Education Pte Ltd Marshall Cavendish Cambridge Primary Science (2nd edition) Stage 4 Homework worksheet (The following content has not been through the Cambridge Assessment International Education endorsement process.) Chapter 5: Materials, Substances and Particles Worksheet 2 (Changing State, Chemical Reactions) 1. What happens when a liquid changes into a solid? Circle the correct answers. The particles lose / gain heat. The particles move faster / slower. The particles move further apart / closer together. 2. Dylan burns a candle. He notices that the candle wax is melting. (a) Which diagram shows how the particles of the candle wax change? Circle the correct answer. A B (b) Complete the sentences to describe what is happening to the particles. Choose from the following words. closer faster fixed random gain slower lose further Particles of the candle wax ______________ heat. They vibrate ______________ and move ______________ apart. When they have enough heat, they break away from their ______________ positions and move around one another. © 2022 Marshall Cavendish Education Pte Ltd 3. A chemical reaction takes place when substances are mixed to form a new substance. Which of these are chemical changes? Tick (√) the three correct answers. burning wood cooking an egg crushing a drink can freezing fruit juice iron rusting tearing paper 4. We may observe some changes when a chemical reaction is taking place. Baking a cake is a chemical reaction. What changes may be observed when the chemical reaction is taking place? Write down one change. _____________________________________________________________ 5. Kai observes an iron nail. The iron nail has a brown substance on it. His mother says that a chemical reaction has happened to the iron nail. Why? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ © 2022 Marshall Cavendish Education Pte Ltd Answers Worksheet 1 (Particle Model and Properties) 1. Solids rock sand ice Liquids milk orange juice water 2. False, True 3. A substance is made of one type of matter. A material can be made of one or more substances. All matter is made up of particles. 4. Aini is incorrect. Her particle model shows a liquid but sand is a solid. Sand is made up of many small grains of sand. Each grain of sand has a fixed shape. 5. (a) Solid (b) The particles are packed very closely together. They have fixed positions. They vibrate about their fixed positions. They cannot move around one another. © 2022 Marshall Cavendish Education Pte Ltd Worksheet 2 (Changing State, Chemical Reactions) 1. The particles lose heat. The particles move slower. The particles move closer together. 2. (a) A (b) Particles of the candle wax gain heat. They vibrate faster and move further apart. When they have enough heat, they break away from their fixed positions and move around one another. 3. burning wood cooking an egg iron rusting 4. We may observe a change in colour. 5. The brown substance on the iron nail is formed when the iron nail reacts with water and air. Thus, a chemical reaction has happened to the iron nail. © 2022 Marshall Cavendish Education Pte Ltd
