Science prep. 1 Final revision

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Final revision Science for Preparatory 1 First Term 2024

1)Choose the correct answer for each of the following:

1)…………..is a solid matter that is soft at room temperature.

a.Sulphur     

b.Carbon          

c.Rubber    

d.Copper

2)From the plants that reproduce by formation of spores is.

a.vougheir.      

b.pine.       

c.bean.    

d.weat.

3)…………….is the ability to do work or make a change.

a.Energy  

b. Weight           

c.Mass      

d. Volume

4)……………is from very active elements chemically.

a.Silver      

b.Gold       

c.Aluminium 

d.Sodium

5)Equal masses of different substances have

 a.equal volumes.

b.different volumes,

c.equal densities.    

d.different shapes.

6)The change of the matter from the solid state to the liquid state is called..

a.boiling.        

b.melting.     

c.dissolving.     

d.freezing.

7)The energy stored in food is………….energy.

a.chemical  

b.mechanical    

c.kinetic   

d.thermal

8)The following plants reproduce by spores except

a.vougheir.  

b.cycas.      

c.adiantum.   

d.ferns.

9)……..are positively charged particles inside the nucleus of the atom.

a.Neutrons   

b.Electrons      

c.Protons    

d.Atoms

10)The scorpion has pairs of jointed legs.

a.4        

b.14               

c.44             

d.24

11)When the body moves upwards,………….

a.the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> energy is increased.

b.the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy is increased.

c.the mass of the body decreased.

d.kinetic energy doesn’t change.

12)We can distinguish between milk and honey by their different…………..

a.smell.

b.heat conduction.

c.odour.

d.taste.

13)The volume of a mixture of 300 cm3 of water and 200 cm3 ethyl alcohol is 500cm3    

a.less than   

b.more than    

c.equal to   

d.no correct answer

14)The outermost energy level of an atom whose atomic number is 12 contains                 electrons.

a.2       

b.8       

c.10      

d.12

15)…………..is a permanent source of energy.

a.Food      

b.Wind         

c.The Sun        

d.Water

16.From animals with internal support is ……..

a.octopus.

b.fish.   

c.snail.     

d.jellyfish.

17.The volume of a mixture of 300 cm3 o water and 200 cm3 ethyl alcohol is.500cm3?

a.less than

b. more than    

c.equal to   

d. no correct answer

18.The outermost energy level of an atom whose atomic number is 12  contains …. .    electrons.

a.2        

b.8        

c.10    

d.12

19…………….is a permanent source of energy.

a.Food

b. Wind      

c. The Sun     

d. Water

20.From animals with internal support is…………..

a.octopus.

b.fish.    

c. snail.     

d.jellyfish.

21.The smell property is a distinguishing factor between

a.wood and plastic.   

b. vinegar and perfume.

c.silver and gold.     

d.iron and copper.

22.The nucleus of……………atom doesn’t contain neutrons.

a.neon       

b. hydrogen   

c.oxygen       

d.helium

23…………….is a permanent source of energy.

a.Food     

b.Wind       

c.The Sun      

d.Electricity

24..From the inert gases is…………..

a.hydrogen.

b.argon.

c. oxygen.      

d.nitrogen.

25..All of the following show structural adaptation,except

a.leaf insect.         

b.chameleon.     

c.stick insect.    

d.drosera.

26..The maximum number of energy levels in the heaviest known atoms is

a.9           

b.7           

C.5           

d.4

27..The mechanical energy is the sum of…………..energies.

a.light and <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a>         

b.heat and <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a>

c.potential and light       

d.kinetic and <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a>

28..Heat is transferred by radiation through.

a.liquid only.            

b.gases only.

c.material media and non-material ones. d.metal only.

29…………….is from arthropods that have numerous legs.

a.Scorpion   

b.Scolopendra    

c.Spider   

d.Ant

30..Secreting sweat by skin is considered…………..adaptation.d.(a) and(c)

a.structural       

b.functional      

c.behavioral

31..Some substances need heat to become soften such as d.rubber.

a.coal.    

b.iron.    

c.sulphur.

 

32.. An object its mass is 2 kg. ad moving at a speed of 4 m/sec.,so its <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a>

energy…………..Joule.

a.16       

b.64         

c.32         

d.2

33..”N”energy level should be filled with…………..electrons.

 a.8   

b.18    

c.32  d

.2

34..The liquid diatomic nonmetal elements is

a.water.  

b.bromine.   

c.mercury.

d.oxygen.

35..Wheat is  ……

a.gymnosperm. 

b.dicotyledon angiosperm.

c.monocotyledon angiosperm.   

d.reproducing by spores.

36…..is a rodent that undergoes aestivation.

a.Frog        

b.Desert snail 

c.Squirrel       

d.Jerboa

37..The nucleus of……………atom doesn’t contain neutrons.

a.neon          

b.oxygen        

c.nitrogen   

d.hydrogen

38..The <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> symbol of silver is………….

a.Au         

b.Ag            

c.Cu          

d.S

39..In the car engine <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> energy changes into…………..energy.d.heat

a.mechanical            

b.electrical                

c.light

40.. Bat’s front limb are modified into…….d.paddles.

a.long arms.             

b.legs.                        

c.wings.

41.The electrons of (19K) are distributed in……….energy levels.

a.four           

b.three             

c.two

42..If the carbon atom has (6) electrons and (6) neutrons, so its mass number equals

a.6           

b.12               

c.22

43……………is from forms of energy…………

a.Sun.

b.light.

c.electric heater.

44..Octopus is from animals with…………..bodies.

a.soft        

b.external support      

c. internal support

45..The particles of …………..atter move with a limited vibrational motion.

a.solid           

b.liquid        

c.gas          

d.all the previous

46..The <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> symbol for an atom of the element sodium is…………..

a.Na       

b.No         

c.N              

d.Ne

47..Heat is transmitted in a vacuum(space)by……………d.all the previous.

 a.conduction.          

b.convection.            

c.radiation.

48.A…………..plant is from gymnosperms.

a.comn     

b.beans       

c.peas  

d.pine

49.The volume of a mixture of 300 cm3 of water and 200 cm3 of ethyl alcohol is 500cm3

a.less than

b.more than

c.equal to    

d.no correct answer

2)Write the scientific term:

1)Modification of a living organism’s behavior or its body structure,or even the biological function of its organs to become more adapated to the environmental condition where it live in.

2)The temperature at which the matter begins to change from the solid state to the liqui state.

3)The basic classification unit for living organisms.

4)The mass per unit volume of the substance.

5)The smallest particle of matter that can exist freely and the properties of matter are evident in it.

6)The energy cannot be created nor destroyed,but it is converted from one form to another.

7)A group of organisms that are most similar in their shape,characteristics,and produce fertilized members upon mating.

8)Invertebrate animals characterized by the presence of jointed legs.

9)The sum of numbers of protons and neutrons in the nucleus.

10)Temperature at which solid substance starts to change into liquid.

11)Energy is neither created nor destroyed, but it is converted from one form to

another.

12)The energy stored in an object due to the work done on it.

14)The energy stored in an object due to the work done on it.

15)The basic classification unit for living organisms.

16)Imaginary regions in which electrons rotate according to their energies.

18)The force that binds the molecules of matter together.

19)Negatively charged particles that revolve around the nucleus.

20)The ability to do work or cause change.

21)Number of positive protons in the nucleus of atom.

22)The product of combination between two or more atoms of different elementswith constant ratio of mass.

23)A form of energy which is transferred from the object of higher temperature to that of lower temperature

24)The fundamental building unit of matter.

25)Plants can’t be distinguished into roots,stems and leaves.

26)The way by which the heat is transferred through gases and space.

27)The ability of some living organisms to be hidden from their enemies or to  capture the preys in the predatory species.

28)Negatively charged particles rotate around the nucleus of the atom.

29)It is an atom that gained a quantum of energy.

30)It is the work done during the motion of an object.

31)The amount of matter in an object.

32)The number of positive protons in the nucleus of an atom of the element.

33)Plants that cannot be distinguished into roots, stems and leaves.

37)The science that deals with classifying living organisms into groups according to their similarities and differences to easy their study.

38)A substance which is formed due to the combination of two or more atoms of different elements with constant weight ratios.

39)Temperature at which a substance changes from solid state to liquid state.

40)The amount of energy lost or gained by an electron when it transfers from one energy level to another.

41)They are small terrestrial plants that reproduce by formation of spores.

42)Organisms can’t be seen by naked eye and spread everywhere around us.

43)Anything has mass and volume.

44)The temperature at which matter changes from a solid state into a liquid one.

45)The simplest pure form of a matter which can’t be analyzed simpler.

46)The ability of some living organisms to be hidden from their enemies or to capture the preys in the predator species.

47)A fundamental building unit of matter which can share in the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> reaction.

48)The behavior that animals do by hiding in humid barrows in winter.

49)The temperature at which a solid substance starts to change into liquid one.

50)It is transfer of heat from hot object to another without any need for material medium through which heat transfer.

51)It is the energy stored in the object due to work done on it.

52)The smallest part of the matter which can exist singular and has a characteristics of the matter.

3)Give an  example for each of the following:

1)Renewable source of energy.

2)A gas used to fill balloons of festivals.

3)A device changes <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> energy into electric energy.

4)An alloy used in making jewels.

5)A liquid diatomic element.

6)Animal aestivate in summer.

7)Arthropod has 3 pairs of jointed legs.

8)Way of transferring heat in air.

9)An inactive metal.

10)A monocotyledon plant.

11)A Nobel gas.        

12)A device changes electric energy to heat energy.

13)An inactive metal.       

14)A monocotyledon plant.

15)A Nobel gas.      

16)A device changes electric energy to heat energy.

17)A substance that has low melting point.   

18)Lagomorphs.

19)A bird feeds on fish.     

20)Dicotyledon plant.  

21)Substance sinks in water.

22)A living organism that makes camouflage.

23)A tool changes <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy to <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> energy and vice versa.

24)An alloy used in the manufacture of jewels.

25)A device used to convert <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> energy into electrical energy.

26)A rodent that undergoes aestivation.

27)A teethless mammal.

28)Ferns.

29)A compound molecule consists of four atoms.

30)A material transfers heat by conduction.13)Soft substance at room temperature.

31)Substance has low melting point.

32)Hibernation.

33)A tool that changes solar energy into heat energy.

34)Lagomorphs.

35)An alloy used in making heating coils.                         

36)Diatomic liquid element.   

37) Animals with soft bodies.                    

38)Camouflage.

39)A permanent source of energy.           

40)Inactive metals.

4)complete

1)Water molecule consists of two…………..atoms and one…………..atom.

2)………….is from electric conductors,while……..is from electric insulators.

3)When you move the pendulum to the left,then release it,the………energy changes into……………energy.

4)…………….and ………………. are from edentates animals.

5)The symbol of calcium is…while the symbol of sodium is………

6)Ammonia molecule consists of………hydrogen atom(s) and…………nitrogen atom(s).

7)Factors affecting <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy are………… of the object and its.from the ground.

8)From plants that have large sized leaves is…… but that have small sized leaves is……………

9)Heat transfers through solids by……..,while through liquids by ………..

10)The liquid element that its molecule consists of only one atom is..   ,while that consists of two atoms is…………..

11)Sodium symbol is……..,while sulphur symbol is ……..

12)The cockroach belongs to….while the scorpion belongs to

13)Heat transfers through solids by………….,while through liquids by..

14)The liquid element that its molecule consists of only one atom is…………..,while that consists of two atoms is…………..

15)Sodium symbol is……………,while sulphur symbol is…..

16)The cockroach belongs to………….,while the scorpion belongs to

17)Simple cell converts…………..energy into…………..energy.

18)From teethless mammals are…………..and…………..

19)The nucleus of an atomcontains positive…………..and neutral.

20)Electric cables are made up of…………..o……………

21)The monoatomic liquid is…………..,while…………is diatomic liquid.

22)……… is the basic unit of classification in living organisms.

23) When a body is raised up the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy ……….,while the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> energy  ……..

24)In the simple electric cell,………….energy changes into

25)Equal masses of different substances have………..volume.

26)The intermolecular spaces among the molecule of solids are very

27)In the car battery…………..energy transforms into

28)Birds feed on meat have…………..and…………..beaks.

29)The nearest energy level to the nucleus is the   level and the farthest is the……..level.

30)Heat is transmitted in iron by………..,while in water heat is transmitted by

31)An alloy of ……….is used in making jewels but an alloy of..  …. is used in heating coils.

32)Activity of <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">bats</a> during night is considered as…………..adaptation.

33)The hydrogen molecule consists of………….while the argon molecule consists of

34)When the speed of pendulum is maximum, the…………..energy is maximum and ……………energy is minimum.

35)The cockroach is from…………..,but scorpion is from……………

36)The measuring unit of density is………….while the measuring unit of work is

5)Complete the sentences by word shown between the brackets:

(sulphur -gas-scorpion-mass-liquid-velocity-iron-cockroach)

1.From the good conductors of electricity is…………..while…………..is from the bad conductors of electricity.

2.The….takes the shape of the container containing it,while the……..has no definite shape.

3.The two factors that affect the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> energy are………….and……

4.Theis considered from insects while the…………..is considered from arachnids.

6)Complete the following sentences by choosing the suitable word from the brackets:

(helium-oxygen-noise-electromagnetic-insectivorous plants-jerboa-frog)

1.Loudspeakers cause……………pollution.

2…………….is used to fill festivals balloons.

3……………are plants that their roots cannot absorb nitrogenous substances from the soil.

4……………is from the rodent animals that undergoes to aestivation.

7)problems

1)If an object with 20 Newton weight is put at 4 meters height from Earth’s surface.

Find its <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy.

2)A stone of mass 5 kg. is located at a height of 8 meters, what is its <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy?(Gravitational acceleration=10 m/s2).

3)If the weight of an object is 20 Newton and its height from the ground is 5 metres

calculate its <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy

4)An object whose mas is 2kg is moving at a speed of 5m/sec calculate its <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> energy

5)If the density of alcohol is 0.8 gm/cm3,find the volume of alcohol if its mass is 88 gm.

6)Calculate the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> energy of an object its mass is 2kg. and is moving at speed equals 5 m/sec.

7)Calculate the density of an object whose mass is 40 grams and occupying a space 50c㎡

8)A ball has a mass of 2 kg, suppose it travels at 10 m/s. speed. Find the <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> energy of it.

9) On determining iron density using a piece of iron its mass 78 gm.the piece is immersed in 100 cm3 of water, the water level increases up to 110 cm. Calculate iron density

8)Give reasons for:

1)The atom of inert gases are stable

2)The mechanical energy of a body remains constant during its falling down, although its <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy decreases

3)The hedgehog has extended front teeth

4)The air conditioner is fixed at the upper part of the room

5)Water is not used to put out petrol fires.

6)The shallow water birds have long and thin beaks.

7)The atom is electrically neutral.

8)Some animals undergo hibernation.

9)Water is not used to put off petrol fires.

10)Cooking pots are made of copper or aluminum

11)Some plants (insectivorous) capture insects to feed on them although they are green plants.

12)The beaks of predatory birds are sharp, strong and crooked.

13)Some plants pounce insects.

14)The equation (2n) is not applied on levels higher than forth level.

15) The heater is placed at the ground.

16)It is impossible for cat to mate rabbit

17)The freezer is found at the top of the fridge.

18)It is preferred to put the heater on the ground.

 

9)What happens when…?

1)Predatory plants can’t capture insects for a long time.

2)Frogs can’t make hibernation.

3)An electron gains a quantum of energy.

4)The weight of an object is doubled at constant height (according to <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy).

5)An electron gains a quantum of energy.

6)The weight of an object is doubled at constant height (according to <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy).

7)What happens: when using water to extinguish petrol fires?

8)The velocity of the ball of the pendulum is maximum.

9)Chameleon can’t make camouflage process

10)The atom gained a quantum of energy.

11)Leaving a piece of iron exposed to moist air for a period of time.

12)The camel’s limbs not end with thick flat pad?

 10)Choose from (A) to (B)

 

 

 10)Put ( ) Or (x) in front of the wrong one :

1-Mechanical energy=Potential energy +Kinetic energy.

2-Octopus is from animals with soft body.

3-Intermolecular force between solid molecules is vanishing.

4.Electrons are positively charged particles that revolve around nucleus with high speed.

5.The third level of the atom can be filled by (32) electrons.

6.Chemical symbol of oxygen is (O).                                                                              

7.The heater is placed on the floor of the room because heat is transmitted by convection in air.

8.Amoeba is from the animals of soft bodies.         

9.Migration of birds is a behavioral adaptation.

10.The sea turtle has an internal support only.

11.When the air is heated, its density increases,so it falls down.

12.Migration of birds is a behavioral adaptation.                                                                 13.Mass number is the sum of protons and electrons.                                                        

14.The sea turtle has an internal support only.                                                                      15.When the air is heated,its density increases, so it falls down.

16.An alloy of nickel-chrome is used in making heating coils.

17.Sugary solution is good conductor of electricity.

18.The bird’s activity during day light is considered a functional adaptation.

19.Cold air rises up. but hot air falls down.                                                                                 20.Reptiles have an external support.    

21.Freezing point is the temperature at which a matter begins to change from liquid  state to gaseous state.

22.In car lamps,electric energy changes to <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">light energy</a>.

23.Cold air rises up, but hot air falls down.

24.Pine plant and cycas from angiosperm.

25.Sodium and platinum react instantly (immediately) with oxygen.()

26.Work done=Force+Displacement.)

27.Forelimb in camel is of solid hoof.()

28.Melting point of ice is zero.

29.The outermost energy level of active elements contains more than 8 electrons.

30.Atomic number is the sum of protons and neutrons inside the nucleus.

31.Gymnosperms are flowering plants that their seeds are formed inside a pericarp.

32.Horses front limbs are modified into arms.                      

33.The density of hydrogen is equal to the density of air.                                                34.Electrons rotate in energy levels according totheir sizes.                                             

35.The <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">kinetic</a> energy of a body at rest is zero.                                                               

36.The stick insect and the leaf insect are examples of adaptation for the purpose of camouflage.   

37.Sodium and potassium are active metals.

38.The fourth energy level saturated by 18 electrons.

39.Jerboa hibernate in winter.

40.The heat transfers through copper by convection.                                                                                

11)Give one difference between:

1-Insects and arachnids.

2-Bromine and mercury.

3-Rodents and lagomorphs.

4-Solar heater and gas oven.

5-Rat and rabbit

6- the camel’s limbs and the horse’s limbs, mentioning the type of adaptation in each of them.

7-Lagomorphs and rodents.

12)Cross out the odd word and write the scientific term of the rest of the word:

1-Hydrogen-Nitrogen-Ammonia-Oxygen.

2-Wax-Butter-Ice-Iron.

3-Nuclear reaction-Weight-Food-Sun.

4-Conduction-Convection-Radiation-Motion.

5-Oxygen-Bromine-Chlorine-Hydrogen.

6-Hedgehog-Sloth-Tiger-Rabbit.

7-Petroleum energy-Water energy-Wind energy-Solar energy.

8-Wheat-Bean-Pea-Pine.

9-Kinetic energy-Potential energy-Mechanical energy-Solar energy.

10-Gold-Silver-Sodium-Platinum.

11-Locust-Mosquito-Cockroach-Spider.

12-Bean-Pea-Adiantum -Maize.

13-Sodium-Copper-Aluminium -Iron.

14-Reptiles-Birds-Fish-Worms.

15-Protons-Neutrons- Quantums -Electrons.

16-Sewing machine-Solar cell-Television-Cellular phone.

17-Dieonea- Drosera – Palm- Halophila.

18-Cockroach-Bee-Mosquito-Spider

19-Wax-Aluminium -Butter-Snow.

20-Ammonia-Water-Oxygen-Hydrogen chloride.

21-Potential Energy-Square of speed-Height-Weight.

22-Lion-Sloth-Tiger-Dog.

23-Ant-Bee-Spider-Cockroach-Locust.

24-Drosera-Dieonea -Cactus-Halophila.

25-Iron-Copper-Aluminium-Wood.

26-Oxygen-Nitrogen-Water-Chlorine.

27-Sulphur-Phosphorus-Aluminium-Plastic.

28-Sun-Coal-Petrol-Natural gas.

29-Dionaea-Drosera-Elodea-Halophila.

30-Octopus-Deseret snail-Jellyfish-Earth worm.

31-Oxygen-Ammonia-Bromine-Carbon.

32-Dieonea-Drosera-Amoeba-Halophila.

33-Ice-Coin-Wood-Oil.

34-Gas oven-Coal heater-Petro stove-Solar oven.

35-Bean-Pea-Maize-Pine-Wheat.

36-Ammonia-Hydrogen-Carbon-Helium-Iron.

37-Sodium-Gold-Silver-Platinum.

38-Sun-Coal-Petrol-Natural gas.

39-Lion-Tiger-Sloth-Wolf.

40-Ant-Bee-Spider-Fly.

41-Ice-Wood-Cork-Iron.

42-Potential energy-Mass-Weight-Height.

43-Dieonea – Drosera -Elodea – Halophila.

44-Conduction-Convection-Friction-Radiation.

45-Ice-Wood-Oil-Iron nail.

46-Cockroach-Flies-Spider-Mosquito.

47-Water-Oxygen-Ammonia.

48-Wheat-Beans-Pea.

49-Acidic solution-Salt solution-Sugary solution.

50Conduction-Friction-Radiation.

51-Solar stove-Solar heater-Solar cell-Solar oven.

52-Octopus-Spider-Jellyfish-Earthworm

53-Acidic solution-Sugary solution-Salt solution-Alkaline solution.

54-Ammonia-Water-Aluminium-Hydrogen chloride.

13)Mention one use for the following:

1-Copper-gold alloy.

2-Aluminium.

3-Waterfalls.                             

4-Long arms in gorillas.

14)Write the number which indicate each of the following:

1.The weight of a body with a mass of 30 kg.(note that the earth’s gravitational acceleration=10m/s2).

2.The atomic number of an atom of an inert element whose electrons orbit (rotate)in three energy level

15)correct

1-In the simple electric cell,  heat energy is converted into electric energy.

2-Pea plant reproduces by formation of spores.

3-A network of wireless of cellular phones cause <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> pollution.

4-Insectivorous plants can’t absorb the nitrogenous substances that make fats.

5-The energy level K is saturated by 8 electrons.

6-Copper rod is the negative pole in the simple electric cell.

7-Pea plant reproduces by formation of spores.

8-Heat transfers in gases and liquid by conduction.

9-We can distinguish between sugar and salt by color.

10-Bromine is a liquid element its molecule consists of 3 atoms.

11-Birds migration is a structural adaptation.

12-Mobile networks cause <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">chemical</a> pollution.

16)Mention the factors affecting <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">potential</a> energy.

17)Mention the factors affecting <a href="https://gogoacademy.net/science-for-primary-4th-final-revision-for-primary-4/">Kinetic</a>  energy.

18)Write the electronic configuration of each element:

Cl17 35

19) Write the symbols of each of the following elements:

1.Potassium.  2.Oxygen 3-Iron  4-Copper 5-Mercury 6-Silver  8-Sulphur 9-Sodium

10-Chlorine  11-Lead  12-Argon  13-neon  14-helium 15-calcium 16-Carbon

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