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Science Finals > Science 59 questions > Flashcards

Science 59 questions Flashcards

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1
Q

The _______ in rbc carry the oxygen

A

haemoglobin

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2
Q

Give the percentage of the gases (Inspired air)
Nitrogen
Oxygen
Carbon dioxide

A

Nitrogen: 78%
Oxygen: 21%
Carbon dioxide: 0.03%

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3
Q

Give the percentage of the gases (expired air)
Nitrogen
Oxygen
Carbon dioxide

A

Nitrogen: 78%
Oxygen: 16%
Carbon dioxide: 4%

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4
Q

Why are red blood cells are unusual cells

A

they do not have nucleus

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5
Q

Why most solutes dissolve faster in hot water than in cold water

A

in hot water, the particles have more energy, they move faster

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6
Q

Why did you use a line drawn in pencil on the ppaper chromatography

A

the pencil lead is insoluble in water, ink will effect the results

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7
Q

why is it important to not let the ink spot go under the water

A

the ink spot will dissolve in water instead of travel upwards if it is under water

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8
Q

in paper chromatography, the dye which treavels the furthest is the __ soluble in the solvent

A

most

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9
Q

what is hydrothermal vent

A

places where hot water from the sea bed rushes out into the water

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10
Q

why are there no plants at hydrothermal vent

A

no light and it is too hot

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11
Q

what is the producer at hydrothermal vent

A

bacteria

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11
Q

define ecosystem

A

a netwrok of interactions between all living organisms and non-living organisms around them

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12
Q

definine bioaccumulation

A

the increase of a toxic substance in an organims

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13
Q

define biomagnification

A

the increase of a toxic substance when going along a food chain from a lower leel to a higher level

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14
Q

what is microplastics

A

plastic that are less than 5mm long

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15
Q

what are the sources of microplastics

A

healthcare and beauty products, big pieces of plastic broken down

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16
Q

what is bioplastics

A

made form biomass resources

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17
Q

give the formula of pressure

A

pressure = force/area

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18
Q

give the formula of moment

A

force x distance (nm)

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19
Q

where did the early atmosphere get used up

A

phtosynthesis
trapped in fossil fuel
trapped in sedimentary rocks

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20
Q

the smaller the surface area of contact, the ________the pressure

A

larger

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21
Q

what is the law of reflection

A

angle of reflection = angle of incidence

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22
Q

a red car appears red under ______ light and ________ light

A

red and white

23
Q

name the atomic model suggested by jj thompson

A

plum pudding model

24
Q

what is a galaxy

A

made of stellar dust, gas, stars and solar systems held together by gravity

25
Q

where is the asteroid belt located

A

mars and jupiter

26
Q

to form haemoglobin, what are the nutrients needed

A

protein and iron

27
Q

iron is important for making ______

A

haemoglobin

28
Q

why do we need fiber in our diet

A

to prevent constipation

29
Q

what substance found in cigarette which can lead to addiction

A

nicotine

30
Q

what is a joint

A

a place where two bones meet

31
Q

what attach muscles to bones

A

tendons

32
Q

state the movement of ball and socket joint

A

circular

33
Q

state the movement of hinge joint

A

back and forth, one direction

34
Q

why do tendons not stretch

A

the bone cannot move

35
Q

what is antagonistic muscles

A

a pair of muscles which work oppositelu

36
Q

when you bend your arm, the biceps ___ while the tricep _______

A

contract, relax

37
Q

during endothermic reaction, thermal energy is _______

A

absorb

38
Q

explain why you get a fizzy feeling when you eat sherbet

A

carbon dioxide is produced

39
Q

what is found in chemical ice pack

A

ammonium nitrate and water

40
Q

function of chemical ice pack

A

reduce swelling

41
Q

what is found in self heating can

A

calcium oxide and water

42
Q

what is the formula for sherbet sweets

A

citric acit+sodium hydrgogencarbonate = sodium citrate+water+carbon dioxide

43
Q

what is galvanizing

A

covering iron with zinc

44
Q

why sodium and potassium must be stored under oil

A

to prevent it reacting with water vapour and oxygen in the air

45
Q

write a word equation for the reaction between potassium and water

A

potassium hydroxide+hydrogen

46
Q

write a word equation for the reaction between magnesium and water

A

magnesium oxide+hydrogen

47
Q

the stronger the magnet, the ________ number of magnetic field lines

A

more

48
Q

the stronger the magnet, the ______ the magnetic field lines

A

closer

49
Q

the magnetic field lines start from ____ pole to ______ pole

A

north, south

50
Q

3 ways to strngthen the electromagnet

A

add soft iron coil
increase number of coil
increase the currrent

51
Q

suggest an application of electromagnet

A

doorbell

52
Q

suggest one difference between permanent magnet and electromagnet

A

permanent magnet cannot switch on and off

53
Q

why the reaction between magnesium and steam is more vigorous then the reaction between magnesium and water?

A

more energy move faster particls

54
Q

difference between endothermic reaction and process

A

Endothermic reaction is a reaction which absobs heat from surroundings. (sherbet sweets)

Endothermic process also absorbs heat from energy, but no new products are formed. (ice melting)

Science Finals (3 decks)

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