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eraser
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seesaw
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gift
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thief
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15
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If a ball thrown vertically to reach 20 m height and its weight is 5 N. Calculate its P.E.
P.E = W X H = 5 X 20 = 100 J
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15
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Complete: ................energy is stored in a car battery.
Chemical
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Calculate the mass of an object, its kinetic energy equals 90 J, and its speed equals 6 m.sec.
5 Kg
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Describe what happens during the heating of solid for a long time.
M. gain T.E, the speed increases, At M.P the I.F weaken, so the I.S increases more and they become more free and the solid melts into liquid
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baam
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gold
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gift
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banana
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15
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GR: A drop of ink spreads through water.
Because the molecules of ink are in a continuous state of motion in all directions among water molecules.
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boom
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magnet
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rocket
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lifesaver
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This element is:.................../ No. of protons:.............../ No of neutrons:....................
Bromine, 35, 45
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GR: Sodium and potassium are kept under kerosene surface.
To protect them from reaction with atmospheric oxygen.
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G.R: Atoms of inactive elements don't take part in the chemical reaction.
The outermost energy level is completely filled with electrons (they are stable)
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Complete: By increasing the height of an object. ...................increases, ..................decreases, .............remains constant.
P.E , K.E , M.E
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15
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What is the energy used and produced?
electric or chemical / thermal
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eraser
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seesaw
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rocket
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banana
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15
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Complete: ..................solution and....................solution are bad electric conductors.
Sugary solution, hydrogen chloride in benzene.
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What are examples of inactive metals?
Gold, Silver, Platinum, Nickel.
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