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~Natural Science Term 2~ > Test-Tues > Flashcards

Test-Tues Flashcards

1
Q

what is the most common liquid around us

A

water

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2
Q

what is the basis of all life and why

A

water,because most things are made up of water.

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3
Q

what shapes the earths surface

A

water

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4
Q

what is a fundamental part of the life process

A

water

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5
Q

Where does water come from

A

Water comes from rain, rivers, springs, and boreholes.

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6
Q

What/who needs water to survive

A

Animals, plants, and people

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7
Q

where is water stored

A

tanks, reservoirs, and storage dams.

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8
Q

what can ater be used for

A

● To wash ourselves, our clothes, and our utensils.
● To transport people and cargo.
● To irrigate crops
● To cool machinery in factories and industries.
● To drink
● Some plants and animals live in water.
● We use water for recreation, e.g. swimming, diving, skiing, fishing, and surfing.
● To conduct religious rituals.
● To process and dilute waste products.

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9
Q

what is a drop of water made of

A

thousands of very small particles of water.

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10
Q

how are particles in steam,water and ice spread out

A

Particles in water are packed more tightly than
particles in steam, and they move slower. Particles in a solid are packed close together and
they do not move very much.

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11
Q

Name all 3 states of water

A

● Solid – ice
● Liquid – water
● Gas – steam/ water vapour

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12
Q

what cause a change in the state of water

A

A change of state in water is caused by a change in temperature.

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13
Q

what happens when water is cooled

A

it condenses and forms liquid

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14
Q

what happens when water is heated

A

it evaporates and creates water vapour

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15
Q

what speeds up the process of evaporation

A

Heat, wind, and a large surface area will speed up the rate of evaporation.

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16
Q

Water is always circulating in nature. This is called the………

A

hydrological cycle.

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17
Q

what is evaporation

A

when water is heated and forms water vapour

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18
Q

where does evaporation take place

A

Evaporation
takes place from all surfaces (e.g. streams, lakes, etc.)

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19
Q

what is transpiration

A

Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers.

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20
Q

what is transpiration

A

Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers.

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21
Q

Where does transpiration take place

A

transpiration takes place from all
plant life.

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22
Q

Ehat does condensation take the place of.

A

Condensation takes place in the form of
precipitation, such as rain, snow, sleet, and hail.

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23
Q

What is percolation

A

Percolation (soak-in) then takes place and
the water goes to the sub-soil, springs, and underground water supplies.

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24
Q

When we add sugar to our tea or coffee and stir it, the grains of sugar do not actually
disappear, even though we can no longer see or feel them. We say the sugar has…..

A

dissolved

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25
Q

what is soluble and insoluble

A

The substances that dissolve in water are said to be soluble. Substances that does not
dissolve in water are said to be insoluble.

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26
Q

what is one of the best solvents

A

water

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27
Q

how much in nature doesnt contain a solute

A

very little

28
Q

what are the advantages of water as a solvent

A

Washing and cleansing,Flavouring of food,Medicine,Plant food and Aquatic life

29
Q

what are the disavantages of water as a solvent

A

The fading of fabrics,Weathering,Leaching of soil, Brackish soil and Hard water

30
Q

what is the solubility of a subject

A

The degree to which a
substance can dissolve in a liquid is called the solubility of the substance.

31
Q

what does solubility depend on

A

The degree to which a
substance can dissolve in a liquid is called the solubility of the substance.

32
Q

what is the rate of solution

A

the speed at wih the soultion dissolve is the rate of solution

33
Q

what does the rate of solution depend on

A

stiirring,how fine the substance is and the tempreture of the solvent

34
Q

what is a saturated soloution

A

when there is too much solute in the solvent,so it cant dissolve

35
Q

what is an unsaturated solution

A

its where the solute can dissolve into the solvent

36
Q

what is a solute

A

the substance dissolved into the solvent

37
Q

what is solvent

A

the liquid in which the solute is dissolved into

38
Q

what is polluted water

A

water with any impurities

39
Q

how many impurities are there that can appear in water

A

3

40
Q

name all 3 impurities that can appear in water

A

soluble impurities,insoluable impurities and living organisms

41
Q

give examples of insoluable impurities

A

slit,mud,roots,oil and leaves

42
Q

give exaples of soluable impurities

A

salts,acids and poison

43
Q

how can soluable impurities be gotten rid of

A

disstilation by somthing called the liebig condenser

44
Q

what is the purest form of water

A

distilled water

45
Q

how is water is big dams purified

A

by tossing decent amounts of chlorine into it

46
Q

how can insoluable impurities be gotten rid of

A

decanation and filtration

47
Q

what is disstiled water used for

A

labs for mixing medicine and for in car batteries

48
Q

how can living organisms be gotten rid of in water

A

sterilization

49
Q

what is sterilization

A

its where u boil the impure water to get rid of all the impurities or treating it with chlorine

50
Q

what is sedimentation

A

it is the process in which insoluable impurities settle at the bottom of the liquid to form sediment

51
Q

what is decantation

A

it is the process in wich you pour the liquid slowly back into another beaker without pouring in any sediment

52
Q

what is filtration

A

it is the process in which very fine insoluable solids can be separated from a liquid-solid mixture by passing it throuh suitable porous material like filter paper.

53
Q

what do you call the liquid contained after filtration

A

the filtrate

54
Q

what forms of water can be used to generate electricity or us

A

running water,falling water and water in the state of steam

55
Q

We say water is a source….

A

of energy

56
Q

what are water wheels

A

water wheels are wheels that are used mainly to drive slow machinery eg flour mills

57
Q

what are the 2 types of water wheels

A

overshot and undershot

58
Q

How does steam help generate electricity

A

Steam is used to power turbines and engines.Steam turbines are also used to
make the wheels of a steam train turn.

59
Q

what happens in nuclear power stations

A

In Nuclear Power Stations a nuclear reaction creates energy which heats water to
produce steam to turn the turbines.

60
Q

what happens in thermal power stations

A

In Thermal Power Stations, coal is burnt to heat water and produce steam. The
steam turns the turbines to produce electricity.

61
Q

where is most of SA electricity produced.

A

Most of SA electricity is produced by
thermal power stations.

62
Q

How does tidal power produce electricity

A

As the tide comes in there is a great deal of force which can be used to
turn water turbines. The water can be trapped behind the dam, and later turn the
turbine as it returns to the sea.

63
Q

how does tidal power produce electricity

A

As the waves move up and down, the Salter’s Ducks wobble up and
down, and this movement can be used to make electricity.

64
Q

name a couple ways you can conserve water in our homes

A

● Take shorter showers and use less water for bathing
● Don’t wash dishes more times in a day than necessary.
● Use cold water instead of hot water to rinse hands and dishes.
● Half-fill the basin rather than letting water run while you brush your teeth, shave, etc.
● Keep your swimming pool level low to reduce wastage from splashing.
● Rinse your car once, then wash using a bucket of soapy water, then rinse again.
● When cleaning your driveway, use a broom or rake to remove dirt and leaves,
instead of using water.
● Put a 2l plastic coke bottle filled with water in the cistern to reduce the water usage
per flush.

65
Q

how can u re-use water

A

● Bath water is fine for watering the garden and lawn.
● When washing your car, used water is fine for chrome, hub-caps, and wheels.
● When back-washing your swimming pool, this water is fine for your lawn and garden.
● Bath water is also ideal for heavy cleaning jobs such as floors.

~Natural Science Term 2~ (1 decks)

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