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Royal International School Answer keys Revision Booklet 2nd Semester Grade 4A 2015-2016 Student name: ________________________ Prepared by: Mr. mongi 1 TABLE OF CONTENTS Pages Unit 5; Weather : Lesson 1 pages 245-258 _________________________3 Unit 5 : Weather lesson 3 pages 273-284____________________________4-6 Unit 6:Earth and Space: Lesson 1 pages 297-312_____________________7 Unit 6:Earth and space: Lesson 2 pages 325-340_______________________8 Unit 7: Properties of matter ; Lesson 1 pp 351-360_____________________9-10 Unit 7: Properties of matter: Lesson 4 pp 351-360_____________________11 Unit 8 : Changes in matter: Lesson 1 pp 392-399-______________________12 Unit 8;Changes in matter: Lesson 3 pp. 405-414 _______________________13 Unit 9 : Energy : Lesson 1, pp 429-444________________________________14 Unit 9 : Energy: Lesson3, pp 447-458 _________________________________17 Unit 9 : Energy: Lesson 5 pp: 463-469__________________________________18-20 2 Unit 5 : Weather Lesson 1 and Lesson 3 pages 245-258 A. Fill in the blanks with words from the box below: Water vapor precipitation Evaporates water cycle condenses 1. The process of water moving from earth to the air and back again is called the cycle. 2. When liquid water changes to a gas it evaporates. 3. Water as a gas is called water vapor. 4. When water vapor condenses clouds form. 5. Water that fails from clouds is called precipitation. 3 Water B. Match each sentence to the correct picture and complete the Sentences: 1. Tool that used to measure temperature in A. degrees Celsius or Fahrenheit called thermometer. 2. Tool that used to measure air pressure in units called mill bars is called barometer. B. 3. Tool that used to measure wind speed is called anemometer. 4. Tool that used to measure the amount of precipitation that has fallen in an area is rain gauge. C. D. 4 C. Match each sentence to the correct picture and complete the sentences : 1. When the air is warm, Precipitation fall as rain. A. 2. When the air is cold enough, Precipitation fall as snow. B. 3. If falling snow melt and refreezes, it changes to sleet 4. Balls of ice often forms during Thunderstorm is called hail. C. D. D- What would happen if the water could not condenses in the atmosphere? Accept any reasonable answer: Sample answer: the water cycle would stop working. Water would evaporate, but there would be no precipitation, eventually there would be no more water on earth’s surface to evaporate. 5 E- Fill in the blanks with words from the box below: Front Weather forecast meteorologist hurricane air mass Doppler radar 1. The meteorologist is a person who studies weather and atmosphere. 2. A air mass is a large body of air with the same temperature and humidity. 3. A (n) weather forecast is a prediction of future weather conditions. 4. The boundary between two different air masses is a front. 5. A (n) hurricane is a storm with wind speeds of at least 119 km/h. 6. A Doppler radar a tool used to see the movement of storm clouds A. Tell which picture show cold front and warm front Cold front warm front 6 Unit 6 : Earth and Space. Lesson 1 and 2 A- Fill in the blanks with words from the box below: Rotate hemisphere Axis orbit model revolve constellation season 1- Axis An imaginary line through Earth. 2- Rotate is when the Earth spinning in space. 3- Orbit is the Earth’s path in space. 4- Earth does this around the sun once a year revolve. 5- Constellation is a pattern of stars in the night sky. 6- Hemisphere is one half of Earth. 7- Model is a representation of the sun-Earth-moon system. 8- Season is a time of year with particular type of weather. B- Some constellations are visible from different places on earth during part of the year. Why are these constellations not visible from every location on earth year-round? Because the earth’s revolution. Answers will vary. 7 C- Choose the correct answer: Earth rotates on its axis once every 24 hours. What is the result of Earth’s rotation? The seasons Night and day The moon’s phases The length of the year Earth is tilted on its axis. Which of these would not exist if Earth had no tilt? Gravity Seasons Lunar phases Earth’s rotation Earth revolves around the sun. How long does it take for Earth to complete one revolution? One day One week One month one year Look at the diagram below. It shows Earth at four positions in its orbit around the sun. At which position does the Northern Hemisphere receive the least amount of sunlight each day? Position I Position II Position III Position IV 8 UNIT 7: Properties of Matter. Lesson 1 and 4 A. Which word describes each photo best( Use each word only once) Mass volume texture density odor hard size shape taste Shape mass Texture size density volume Odor hard taste D- Circle the letter of correct answer: Objects can be sorted into groups using properties. What is a physical property of an object? Something that can be measured without changing the composition of an object The name of the person who owns the object The distance between a person and the object Something that can be observed when an object is changed into a new substance 9 Length is a physical property that can be observed. The picture below demonstrates one way to find length. What is the length of the pen? 12.8 cm 13 cm 13.5 cm 14 cm During science class, the teacher displayed a glass containing a liquid. The teacher said the liquid was either water or colorless vinegar. Which physical property could the students use to identify the liquid as vinegar? color smell mass volume Objects can be sorted using physical properties that can be measured. Which property can be measured using a pan balance? hardness length mass volume Dottie has a blue, plastic set of alphabet letters. She decides to sort the letters using a physical property. Which property should she use? color hardness odor shape E- Write the vocabulary term that matches each photo and caption Change of state gas Evaporation The sun’s heat will make this water Change to gas liquid evaporation gas These particles move very quickly and spread out in all directions. 10 Liquid The water in this bottle has A definite volume and takes the shape of its container. change of state This happen when water changes form. F- Complete the following chart using the words in the box below: Evaporation melting Condensation Freezing Ice __________________ Freezing Melting Liquid water Condensation ____________________ Evaporation _____________________ Water vapor G- Fill in the missing information to describe each change of state: Freezing Liquid to solid Energy removed Melting solid to Liquid Condensation Gas to liquid Energy removed Energy added Evaporation Liquid to gas Energy added 11 Unit 8: Changes in Matter. Lesson 1 and 3 A- Choose the correct answer: Khalil cuts a stick of butter in half. Which statement about the butter is true? The butter has changed state. The butter has different ingredients. The butter has kept its shape. The butter has different physical properties. These ice cubes were taken from the freezer and set out on the counter. This picture shows what the ice looks like 5 minutes later. What is causing this physical change? Heat energy is moving from the ice to the air. Heat energy is moving from the air to the ice. Heat energy is causing the liquid water to freeze. Heat energy is moving between the two ice cubes. Air is a mixture that contains about 80 percent nitrogen and about 20 percent oxygen. Which statement is true? Oxygen is a solvent. Nitrogen is a solvent. The two gases cannot be separated. The two gases can melt to form water. On a hot summer day, Jenna poured juice into an ice cube tray. She put the tray into the freezer. When she removed the tray, the juice was frozen. How many physical changes took place from the time Jenna poured the juice until it came out of the freezer? 1 2 3 4 12 B- Use the terms in the box to complete the sentences. chemical change Mixture chemical property physical change chemical reaction solution 1. A change in matter in which a new substance is not formed is a physical change 2. A mixt that has the same composition throughout because all the parts are mixed evenly is called a(n) solution. 3. A characteristic that describes how a substance will ineteract with another substance is chemical property . 4. The picture of the salad shows a combination of two or more differenct substances in which substances keep their own properties. This salad is an example of a mixture . 5. Any change in matter in which a new and different substances form is called a chemical change . 6. Another name for a chemical change is a chemical reaction . C- True or False: Write True if the statement is correct and false if it is wrong. 1. Odor, a change in color, light, heat, and gas bubbles are signs of chemical change. True 2. Warm milk spoils slower than cold milk. false 3. The ability to rust is a chemical property of iron, but not aluminum. True 4. Leaves give off a smelly gas as they break down; the smell signals a chemical change true 5. Mold, cooking, burning, and rust are examples of physical change. False 13 Unit 9: Energy: Lesson 1 and 3 A- Circle the letter of the correct answer: 1- Ellie plugs a radio into an electrical outlet and turns it on. What change in energy takes place when she does this? Light energy changes into sound energy. Electrical energy changes into sound energy. Sound energy changes into electrical energy. Chemical energy changes into sound energy. 2- Fossil fuels are the most common source of energy. What else is TRUE of fossil fuels? They are renewable. They form quickly underground. They can be made in a laboratory. They are burned to release energy. 3- A rolling ball has kinetic energy. What does it mean for an object to have kinetic energy? The object is in motion. The object has stored energy. The object has used all of its energy. The object is passing on its energy. 4. Objects can have potential energy because of their position. Which object has potential energy? book sitting on a table hands turning on a clock spinning wheels on a bike flag flapping in the wind 5. Objects may have potential energy or kinetic energy. How do potential energy and kinetic energy compare to each other? Both describe objects at rest. Both describe objects in motion. Both are forms of mechanical energy. An increase in one leads to an increase in the other 14 6. Use the words from the box to label each picture. Each term will be used once. Chemical energy kinetic energy Sound energy Kinetic energy This boy has an up-and-down motion. sound energy chemical energy you can feel the cello’s vibrations Kinetic energy The roller coaster cars go to the top of the Hill and stop for a moment. potential energy light energy food give this bird the energy itneeds to live. light energy you can carry these glow sticks in the dark so people can see you. 7. TRUE OR FALSE: Write T if it is TRUE and F if it is FALSE. 1. You use energy to ride a bike. True 2-.Energy is not the ability to cause movement. False 3.-There are many forms of energy. True 4.-Light energy is the energy you can see. True 5.-Kinetic Energy is the energy in motion. True 6.-Potential energy is stored energy. True 15 8. .Match the forms of energy to the corresponding picture. 1. Electrical energy 2. Mechanical energy 3. Sound energy 4. Light energy 5. Chemical energy 16 9. Choose words from the box to complete the Forms of Energy word web. Food Energy Mechanical energy gasoline Potential energy Chemical energy Kinetic energy Energy Chemical energy Food Mechanical energy Gasoline 10. Describe Kinetic energy Potential energy how sound energy is produced when you strike the top of the dram. Accept any reasonable answer: Sample answer: when the top of the dram vibrate it will produces sound waves, those waves goes directly to our ears. 17 Unit 9: Energy: Lesson 5: Heat 1) Convection and radiation Radiation Radiation Conduction and radiation 2- Conduction Convection Radiation 18 3- Label each of the following as examples of conduction, convection, or radiation. Hot water added to bath space heater Convection/conduction radiation/convection Iron on a decal Conduction colthes dryer radiation/conduction Sunlight through a windows sandwich press Radiation conduction 4- Write the vocabulary term that describes each material Conducator insulator Conductor insulator Insulator conductor 19 insulator conductor 5- Use the words from the box below to complete each sentence: Conduction / heat / campfire / radiation transfers / convection A- How heat moves from one end of a solid to the other isconduction _ B- The topic of this lesson is heat. C- What heat does during convection or conduction is transfers. D- Heat moves from this source by convection and radiation campfire. E- How heat travels through empty space radiation. 6- Write the kind of heat transfer that takes place in the following situations. (Convection, conduction) A- An eruption of lava on the ocean floor ___________ Convection ___________________ B- Winds blowing in from a warmer part of the country ____________ Convection _____________ C- Feet touching a cold floor ____________conduction____________ 7- Tell whether the statement is True or False: A- Heat moves easily through a conductor True / False B- Heat does not move easily through an insulator True / False C- A thin layer of trapped air can conduct the heat True / False D- Solids often insulate the heat True / False 20