[8 Cambridge Assessment LB International Education Science Stage 7 Paper 1 2023 Cambridge Lower Secondary Progression Test 45 minutes No additional materials are needed. INSTRUCTIONS + Answer all questions. + Write your answer to each question in the space provided. + You should show all your working on the question paper. INFORMATION * The total mark for this paper is 50. + The number of marks for each question or part question is shown in brackets [ J. 144.01 7RP. UCLES 20231 This question is about cells. (a) Drawa straight line to match each part of a cell to its correct function. part of a cell function controls the movement of substances into and out of the cell contains genetic information and controls what happens inside the cell cell membrane cytoplasm jelly-lke substance, where ‘chemical reactions happen mitochondria where most respiration reactions happen (2) (b) Look at the diagram of a plant palisade cell, nucleus chloroplasts ——_ cell membrane (2) euctes 2023 a14a.o1(c) Euglena is a single-celled organism. Look at the diagram of an euglena. flagellum: ~eye spot cytoplasm— nucleus — chloroplast cell membrane ——| Explain why euglena is difficult to classify as either a plant cell or an animal cell euctes 2023 a14a_o1 [Turn over2 This question is about materials. Draw a straight line to match each material to its correct description material alloy ‘compound ‘element euctes 2023 a14a.o1 description ‘a pure substance containing the same type of atom a pure substance containing different types of atoms bonded together ‘a mixture containing two different types of metal atoms an impure substance containing the same type of atom ‘a Substance containing atoms that are free to move BI3. Sound is reflected by hard surfaces. (a) What is the name given to a reflected sound? {b) A ship is using sound to calculate the distance to the seabed. The ship produces a sound. ‘The sound travels to the seabed and is reflected back to the ship. ‘seabed In water, sound travels a distance of 1500 m in one second. The reflected sound is detected after 4 seconds. Calculate the distance from the bottom of the ship to the seabed. [2] euctes 2023 a14a_o1 [Turn over6 4 The solid outer layer of the Earth is made up of large tectonic plates. Look at the diagram showing a model of what happens when two tectonic plates meet. (a) Write down the name of the two parts of the Earth that form this solid outer layer. 1 {b) Write down three different events that happen near the boundaries of tectonic plates. euctes 2023 anea_ot7 5 The incomplete dichotomous key shows different features of vertebrates. Write words from the list in the boxes to complete the key. amphibian bird fish mammal reptile vertebrate fur no fur feathers no feathers dry scaly skin moist skin scales no scales [3] euctes 2023 a14a_o1 [Turn over6 8 Chen tests some chemicals with Universal Indicator. His results are shown on a pH chart. 1]2/3]4]s]e]7] 8] frol1]12]13] 14 tf tf ot ft lemon vinegar bath floor paint juice salts cleaner stripper Use the pH chart to answer the questions. (a) Write down the pH of vinegar. (b) Paint stripper is tested with Universal Indicator. Write down the colour of the Universal Indicator after the test. (c) Pure water is neutral. Write down the pH of a neutral solution, (4) Which chemical in the pH chart is the most acidic? euctes 2023 a14a.o1 1 a 1 19 7 Energy is transferred from one form into another. (a) The diagram shows a television. = Complete the energy transfer for the television. energy energy energy energy 1 {b) A car transfers chemical energy in gasoline (petrol) into thermal energy, sound energy and kinetic energy only. The car transfers 100 J of chemical energy into 70J of thermal energy and 10J of sound energy, (i) Calculate how much chemical energy is transferred into kinetic energy. (ii) Describe what happens to the sound and thermal energy. euctes 2023 a14a_o1 [Turn over10 Look at the table showing the percentage by volume of different gases in clean, dry air. gas percentage by volume 78 oxygen ‘Complete the table with the name of the missing gas and the missing percentage. (2) 9 Donkeys mate and produce new generations of donkeys. Horses mate and produce new generations of horses. ‘Amale donkey and a female horse mate and produce a mule. Mules mate but do not produce offspring. Tick (V) to show which of the animals are species. donkey horse mule Explain your answer, a euctes 2023 a14a.o1" 10. Safia investigates chemical reactions. {a) Safia adds two colourless solutions together. She sees that a white solid is made. Name the process that happens when this white solid is made from the two solutions. Circle the correct answer. alloying decomposition melting precipitation ti {b) Safia now adds sodium hydroxide solution to dilute hydrochloric acid. Sodium hydroxide solution is an alkali What happens to the pH of the dilute hydrochloric acid as the sodium hydroxide solution is added? Explain your answer. (2) euctes 2023 a14a_o1 [Turn over12 11 Blessy collects some information about gravity on different planets in the Solar System. (a) What is gravity? {b) Look at the information Blessy collects. planet enema aera ‘Venus: 08 09 Neptune 17 41 ()) Write down the name of the planet that has the greatest gravity. (ii) Write down a conclusion about the relationship between mass of planet and gravity. Include information from the table in your answer: euctes 2023 a14a.o113 12 Aresearch chemist investigates some compounds. She wants to dissolve them in water and test the pH of the solution. Look at the table showing the compounds she uses and their hazard symbols. ‘compound hazard symbol description of hazard sulfuric acid hazardous to the potassium nitrate environment ethanol mercury nitrate OP OD Complete the table to describe the hazard for each compound. (One has been done for you. BI euctes 2023 a14a_o1 [Turn over4 13. Oliver investigates electricity He makes an electrical circuit using different materials to complete the circuit. -lamp material SY He records his observations. Look at his results. material ‘does the lamp light? iron yes steel yes plastic no wood no rubber no graphite yes alu yes (a) Write down all the materials in the table that conduct electricity (b) Write down the name of the particles that flow through conductors, (1) (c) Write down the word used to describe materials that do not conduct electricity. euctes 2023 a14a.o114 Look at the incomplete food web. y B snake rabbit / = es / a mouse ‘The grasshopper feeds on grass, ‘The lizard feeds on the grasshopper. ‘The hawk feeds on the snake, the rabbit, the grasshopper and the lizard, (2) (a) Draw arrows to complete the food web. (b) The hawk is a top predator and is not eaten by other predators. Write down two ways that energy from the hawk is returned to the grass. 1 ‘eazorabieefet nas been mace bye pusher (CLES) oWece cept hers bu ary ome ogling Soars have una cl etre le ee oon antes, cr arog epi ra ne Crbg eae ‘Cambridge Assessment eran Educaion spar of Cartridge Assesment. 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