alex 7 science unit 2 test

Question 1

energy

Answer 1

The ability to do work or cause change. Energy
has many forms, all of which measure the ability of an object to do work on or change another object.In other words, there are different ways that an object can possess energy.

Question 2

mechanical energy

Answer 2

kinetic

potential

Question 3

different forms

Answer 3

Thermal, or heat energy
Chemical Energy
Electrical Energy
Electrochemical Energy
Electromagnetic Energy (light)
Sound Energy
Nuclear Energy

Question 4

potential energy

Answer 4

Potential energy is energy due to position or stored energy. Potential energy is also called gravitational potential energy.

Question 5

Kinetic energy

Answer 5

Kinetic energy is the energy of motion. Kinetic energy is measured by how much is work done to put an object in motion or to rest.

Question 6

Conservation of Energy law

Answer 6

Energy cannot be created or destroyed; it can only be changed from one of form of energy to another form. The amount of energy stays the same.

Question 7

Temperature

Answer 7

How hot or cold it is. Measured in degrees Celsius.

Question 8

Heat

Answer 8

The amount of thermal energy, measured in joules or J. exampleA cup of hot tea has heat energy in the form of kinetic energy from its particles.

Question 9

Matter

Answer 9

Anything that moves

Anything that takes up space

Question 10

3 types of matter

Answer 10

Solid
liquid
gas

Question 11

how does matter change

Answer 11

freezing
 melting 
boiling
 Condensing
Evaporation
sublimation

Question 12

evaporation

Answer 12

particles in a liquid escape to form a vapour.Evaporation can occur at any temperature but it occurs most rapidly at a liquid’s boiling point.The particles that escape take some energy from the remaining particles and so the temperature of the liquid falls.

Question 13

The Law of Conservation of Energy

Answer 13

Energy is always conserved, it is never “lost” or “wasted“.Some energy transfers are useful and some are not.

Question 14

The particle model

Answer 14

All substances are made up of particles (atoms, ions or molecules).These particles are attracted to each other, some strongly and others weakly.These particles move around (i.e. have kinetic energy).The kinetic energy of particles increases with temperature.

Question 15

Solid to liquid

Answer 15

melting

Question 16

Liquid to gas

Answer 16

evaporation

Question 17

Gas to solid

Answer 17

sublimation

Question 18

Solid to gas

Answer 18

sublimation

Question 19

Gas to liquid

Answer 19

condensation

Question 20

Liquid to solid

Answer 20

freezing

Question 21

Types of thermometers

Answer 21

Thermo couple
Bimetallic strip
recording thermometer
Inferred thermo gram

Question 22

malleable

Answer 22

bendable

Question 23

ductility

Answer 23

strech

Question 24

Parts of a thermometer

Answer 24

Sensor
Signal
responder

Question 25

Boiling point water kelvin

Answer 25

373.15

Question 26

Boiling point water Celsius

Answer 26

100

Question 27

Boiling point water Fahrenheit

Answer 27

212

Question 28

Melting point water kelvin

Answer 28

273.15

Question 29

Melting point water Celsius

Answer 29

0

Question 30

Melting point water Fahrenheit

Answer 30

32

Question 31

Absolute zero kelvin

Answer 31

0

Question 32

Absolute zero Celsius

Answer 32

-273.15

Question 33

Absolute zero Fahrenheit

Answer 33

-459.67`

Question 34

Melting is also called

Answer 34

fusion

Question 35

Fusion is also called

Answer 35

melting

Question 36

Freezing is also called

Answer 36

solidification

Question 37

Solidification is also called

Answer 37

freezing

Question 38

radiation

Answer 38

gas

Question 39

conduction

Answer 39

solid

Question 40

convection

Answer 40

liquid

Question 41

rsi value

Answer 41

resistance

Question 42

Sources of energy

Answer 42

``` Chemical Geothermal Electrical Fossil fuels wind Mechanical Solar nuclear ```

Question 43

Passive solar heating

Answer 43

uses materials in structure to heat home

Question 44

Active solar heating

Answer 44

Uses mechanical devices to heat home

Question 45

Non-renewable resources

Answer 45

Millions of years to form

Question 46

Renewable resources

Answer 46

Can be recycled

Question 47

Greenhouse effect

Answer 47

Global warming

Question 48

cogeneration

Answer 48

waste heat being used to heat buildings

Question 49

Thermal pollution

Answer 49

Technology and industries release a lot of thermal energy into environment

Question 50

Liquid

Answer 50

Gas | liquid

Question 51

insulators

Answer 51

Poor conductors