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science yr9 > January Exam > Flashcards

January Exam Flashcards

1
Q

What is the first stage of drinking water?

A

Preliminary

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2
Q

What is the second stage of drinking water?

A

Sedimentation

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3
Q

What is the third stage of drinking water?

A

Aerobic digestion

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4
Q

What is the fourth stage of drinking water?

A

Anaerobic digestion

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5
Q

What happens in the first stage of drinking water?

A

Screening is done to remove large bits like bags, twigs and grit from the sewage

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6
Q

What happens in the third stage of drinking water?

REMOVED

A

Effluent is removed and mixed with bacteria in the presence of lots of oxygen, the bacteria aerobically digest organic matter in the effluent including other microbes.

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6
Q

What happens in the second stage of drinking water?

A

During sedimentation heavier sewage sinks know as sludge, lighter sewage floats known as effluent

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6
Q

What happens in the fourth stage of drinking water?

broken down

A

Sludge is broken down by bacteria in a different process called anaerobic digestion

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6
Q

What does anaerobic digestion produce?

A

Lots of methane gas which can be used as an energy source to power the plant or neighbouring homes.

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6
Q

What is ozone disinfection?

A

involves pumping an electrical current through the water that causes oxygen molecules to disassociate and combine with a free oxygen molecule forming O3(also known as ozone)

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7
Q

What happens on UV disinfection?

A

the bacteria in the water aren’t killed rather there sterilised making them harmless.

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8
Q

How does chlorine disinfect water?

A

Through chemical disinfection. It is added to the effluent to kill off any bacteria and organisms still living in the water. It is then removed before it can be discharged as to not kill off anything in the discharge location

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9
Q

How long does the process of waste water treatment take?

A

Average 24 - 36 hours

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10
Q

Where is the effluent released?

A

Stream or lake or other water source.
Discharged into another treatment plant directly.

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11
Q

What are bar screens?

A

large vertical bars that stand at the inlet of nearly every waste water treatment plant

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12
Q

What are grit chambers?

sift

A

As the sewage flows into the grit chamber the velocity of the sewage is adjusted to allow for particles of sand and rock to settle out.

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13
Q

What are the three grit chambers?

A

Horizontal grit chambers
Aerated grit chambers
Vortex grit chambers

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14
Q

What is settling velocity?

A

speed at which a particle settles

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15
Q

What is scalar?

A

Quantities have magnitude only

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16
Q

What is vector?

A

Quantities have magnitude and an associated direction

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17
Q

What is speed?

A

How fast an object is travelling

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18
Q

What is velocity?

A

Speed with direction

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19
Q

What is acceleration?

A

The rate of change of velocity

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20
Q

Distance

A

Scalar

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21
Q

Displacement

A

Vector

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22
Q

Speed

A

Scalar

23
Q

Velocity

A

vecor

24
Q

Acceleration

A

Vector

25
Q

What is displacement

A

Shortest point between the two points

26
Q

What is the SI unit of force?

A

Newton

27
Q

What is the unit for mass?

A

kg

28
Q

What is the unit for acceleration?

A

m/s 2

29
Q

What is mass?

A

How much of you there is

30
Q

What is weight?

A

Is a FORCE of gravity. It is how strongly gravity pulls an object towards Earth

31
Q

What is the centre of mass?

A

Is where gravity affects you from

32
Q

How do you calculate weight?

A

Mass x Gravitational Field Strength

33
Q

What are bar screens designed to do?

A

designed to stop larger items from getting to the plant inverting machinery like pumps

34
Q

What happens in Interphase?

A

cell organelles reproduce
DNA replicated
basic cell metabolism increases
Nuclear membrane breaks down

35
Q

What is the purpose of mitosis?

A

Growth
Repair
reproduce

36
Q

How to calculate micrometres to Nano meters?

A

x 1000

37
Q

How to calculate Nano meters to micrometres?

A

/ 1000

38
Q

How to calculate micrometres to milometers?

A

/ 1000

39
Q

How to calculate milometers to micrometres?

A

x 1000

40
Q

How to calculate milometers to centimetres?

A

/ 10

41
Q

How to calculate centimetres to milometers?

A

x 10

42
Q

How to calculate metres to milometers?

A

x 1000

43
Q

How to calculate milometers to metres?

A

/ 1000

44
Q

What does homozygous mean?

A

having two identical alleles of a particular gene or genes

45
Q

What does heterozygous mean?

A

having two different alleles of a particular gene or genes.

46
Q

what is genotype?

A

combination of alleles

47
Q

What is distillation

A

separates a soluble and a non soluble substance with evaporation

48
Q

What is scalar?

A

size or magnitude ONLY

49
Q

What is vector?

A

direction and size

50
Q

Displaysment

A

Vector

51
Q

Speed

A

scalar

52
Q

upthrust

A

vector

53
Q

weight

A

vector

54
Q

mass

A

scalar

55
Q

time

A

scalar

56
Q

forces

A

vector

57
Q

acceleration

A

vector

58
Q

temperature

A

scalar

59
Q

what is a genotype?

A

the coding for your characteristics

60
Q

What is the table for dominant and recessive?

A

Punet square

science yr9 (4 decks)

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