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Revision on concept 2.1

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Ahmed Abdelnaser

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Froggy Jumps scienceVersión en línea Revision on concept 2.1 por Ahmed Abdelnaser 1 The molecule is composed of very small particles called .................... a cells b atoms c mixtures 2 Both ..................... and ........................ are examples of liquid matter. a water - milk b water - wood c oil - paper 3 Particles of all the following substances have a lot of energy, except .................. a oxygen b water vapor c glass 4 Thermal energy affects ....................... and ..................... of a matter. a temperature - state b temperature - color c color - smell 5 The ........................ energy is related to the motion of particles of a matter. a potential b chemical c thermal 6 On boiling water inside a kettle, ...................... a water particles will move faster b water particles will move slower c thermal energy of water will decrease 7 When you touch a piece of ice, heat transfers from ....................... to .......................... a the ice - your hand b the ice - your body c your hand - the ice 8 Heat transfers from .......................... a a hot object to an object that has the same temperature b a cold object to a hot object c a hot object to a cold object 9 Temperature is a measure of the ........................ energy of molecules of a substance. a kinetic b potential c light 10 When the molecules of a substance gain thermal energy, their total kinetic energy ........................ and the temperature of the substance ........................ a decreases - decreases b increases - increases c decreases - increases 11 Melting process is the change of substance from ......................... state to .................. state. a solid-liquid b liquid - gas c liquid - solid 12 When wax melts, its particles ........................ a gain thermal energy and speed up b lose thermal energy and speed up c lose thermal energy and slow down 13 In which state(s) of matter are the molecules away from each other ? ........................ a Solid b Gas c solid and gas 14 The state(s) of matter with the greatest amount of energy is/are ........................... a liquid b solid c gas 15 Water molecules have the lowest kinetic energy when it is in the form of ................ a ice b water c steam 16 Changing ice into water followed by changing water into steam shows two different processes which are ............................... and ................................. a evaporation - condensation b melting - freezing c melting - evaporation 17 Boiling point of a substance is the temperature at which ............................. changes into ......................... a gas - liquid b liquid - gas c solid - liquid 18 On a very hot summer morning, water on the ground may turn into water vapor, this change is called ..................... a melting b evaporation c condensation 19 Some thermometers contain colored alcohol, what happens to alcohol when the thermometer is placed in hot water ? ....................... a Alcohol contracts b Alcohol evaporates c Alcohol expands 20 When the temperature of a rod of iron is increased, ................ a its length increases b its length decreases to its half c its length doesn't change 21 When the temperature of alcohol inside thermometers increases, its volume ........................ a decreases causing its expansion b decreases causing its contraction c increases causing its expansion 22 The spaces between molecules ....................... during the melting of solids. a decrease b increase c may increase or decrease 23 By decreasing the temperature of a substance, its molecules move ................... each other and the spaces between them ........................ a closer to - increase b farther from - increase c closer to - decrease 24 By increasing the temperature of a substance, its molecules move ................. each other and the spaces between them .................. a farther from - increase b closer to - increase c farther from - decrease 25 A metallic rod of 50 meter length was heated at high temperature, its length could reach ........................... meter after heating. a 47 b 49 c 51 26 Materials ...................... on heating. a expand b contract c compress 27 Metallic parts of a bridge .................. in different temperatures. a expand only b contract only c expand and contract 28 When the kinetic energy of liquids decreases, they may .................. a expand b contract c 29 Railroad tracks are made up of ......................... a glass b plastic c iron 30 Engineers leave ........................ between railroad tracks. a small spaces b very large spaces c large spaces 31 Materials .................... by ...................... their temperatures. a expand - decreasing b contract - increasing c contract - decreasing

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scienceVersión en línea

por Ahmed Abdelnaser

The molecule is composed of very small particles called ....................

Both ..................... and ........................ are examples of liquid matter.

Particles of all the following substances have a lot of energy, except ..................

Thermal energy affects ....................... and ..................... of a matter.

The ........................ energy is related to the motion of particles of a matter.

On boiling water inside a kettle, ......................

When you touch a piece of ice, heat transfers from ....................... to ..........................

Heat transfers from ..........................

Temperature is a measure of the ........................ energy of molecules of a substance.

When the molecules of a substance gain thermal energy, their total kinetic energy ........................ and the temperature of the substance ........................

Melting process is the change of substance from ......................... state to .................. state.

When wax melts, its particles ........................

In which state(s) of matter are the molecules away from each other ? ........................

The state(s) of matter with the greatest amount of energy is/are ...........................

Water molecules have the lowest kinetic energy when it is in the form of ................

Changing ice into water followed by changing water into steam shows two different processes which are ............................... and .................................

Boiling point of a substance is the temperature at which ............................. changes into .........................

On a very hot summer morning, water on the ground may turn into water vapor, this change is called .....................

Some thermometers contain colored alcohol, what happens to alcohol when the thermometer is placed in hot water ? .......................

When the temperature of a rod of iron is increased, ................

When the temperature of alcohol inside thermometers increases, its volume ........................

The spaces between molecules ....................... during the melting of solids.

By decreasing the temperature of a substance, its molecules move ................... each other and the spaces between them ........................

By increasing the temperature of a substance, its molecules move ................. each other and the spaces between them ..................

A metallic rod of 50 meter length was heated at high temperature, its length could reach ........................... meter after heating.

Materials ...................... on heating.

Metallic parts of a bridge .................. in different temperatures.

When the kinetic energy of liquids decreases, they may ..................

Railroad tracks are made up of .........................

Engineers leave ........................ between railroad tracks.

Materials .................... by ...................... their temperatures.