worksheet_07.doc

7 Worksheet (AS) Data needed to answer questions can be found in the Data, formulae and relationships sheet. 1

Smoke particles suspended in air inside a sealed container are illuminated by a strong s ource of light and observed with a microscope. A smoke particle is seen to be in random motion. What is the reason for this? !" A B C D

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#he smoke particle absorbs energy from the light source. #he smoke particle collides with air molecules. #he smoke particle collides with other smoke particles. #here are convection currents in the t he air.

$iquid % has a density of !&'' kg m () and liquid * has a density of !+'' kg m (). At what depth in each liquid is the pressure in liquid % equal to the pressure in liquid *?

A B C D 3

Dept Depth h in in liq liqu uid Y / m !+ ! !& !+

Why does the pressure pressure of of a gas increase increase when the volume decreases decreases at constant temperature? A B C D

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Depth epth in liqu liquid id X / m !& ! !+ !-

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#he gas molecules hit each other more often. #he gas molecules hit the wall of the container at higher speeds. #he gas molecules hit the wall of the container more often. #here are more gas molecules present to hit the wall of the container.

Which statement is true about water molecules at ' /0?

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A #here are forces between the molecules and no molecules have enough energy to escape the liquid. B #here are forces between the molecules and some molecules have enough energy to escape the liquid. C #here are no forces between the molecules and no molecules have enough energy to escape the liquid. D #here are no forces between the molecules and some molecules have enough energy to escape the liquid. 5

Which row correctly compares the ordering and the separation of molecules in solids, liquids and gases? Ordering of molecules A B C D

molecules in a liquid have no order  molecules in a solid are more ordered than in liquids molecules in a solid are more ordered than in liquids molecules in a gas have no order 

AS and A $evel 1hysics

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ep!r!tion of molecules

solid and gas molecules have about the same separation solid and liquid molecules have about the same separation liquid and gas molecules have about the same separation liquid and gas molecules have about the same separation

2riginal material 3 0ambridge 4niversity 1ress 5'!'

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7 Worksheet (AS)

 " Describe the arrangement of atoms, the forces between the atoms and the motion of the atoms in6 ! # c

a solid a liquid a gas.

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 $ A small amount of gas is trapped inside a container. Describe the motion of the gas atoms as the temperature of the gas within the container is increased.

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 % Stat Statee one one diff differ eren ence ce and and on one sim simil ilar arit ity y betw betwee een n the the boil boilin ing g and and evap evapor orat atio ion n of of wat water er..

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 & A person of weight -5' 7 stands on one leg. #he area of the foot in contact with the floor is !.& × !'(5 m5. !

0alculate the pressure e8erted by the foot on the ground.

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98plain what would happen to the pressure e8erted on the floor if the person stands on tiptoe on one leg.

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1' A bicycle of mass ) kg is resting on its two tyres on flat ground. #he pressure at the base of each tyre is !. × !' 1a. 0alculate the area of each tyre in contact with the ground.

*ou ma y assume that each tyre supports half the weight of the bicycle.

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11 #he diagram shows a sealed container filled with air and attached to a manometer. #he liquid in the manometer has a density of !5'' kg m (). Atmospheric pressure is !.'5 × !' 1a. ! #

0alculate the pressure of the air inside the sealed container.

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4sing the kinetic model, e8plain why the  pressure of the air in the container rises when the temperature increases.

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12 0opper has density -:)' kg m () and ;inc has density !)' kg m ().