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Royal International School
Answer keys
Revision Booklet
2nd Semester
Grade 4A
2015-2016
Student name: ________________________
Prepared by: Mr. mongi
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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
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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.
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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.
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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.
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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
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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.
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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
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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
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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.
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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
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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
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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
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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
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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
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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
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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.
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Unit 9: Energy: Lesson 5: Heat
1)
Convection and radiation
Radiation
Radiation
Conduction and radiation
2-
Conduction
Convection
Radiation
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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
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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
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