Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Science Finals > Science in general 1-7 > Flashcards

Science in general 1-7 Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

rib function

A

protect the lung

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

lung

A

for breathing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

air sacs

A

gas exchange happens here

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

bronchus

A

allows air to flow deep into the lungs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

bronchiole

A

allows air to flow deeper into the lungs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

trachea

A

allow air to flow from larynxt into the lungs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

larynx

A

produces sound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

respiration

A

chemical reaction that happens in every living cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

aerobic respiration

A

the kind of respiration that usually happens inside our cells and takes place in the presence of oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

aerobic respiration formula

A

Glucose+oxygen=carbon dioxide+water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

where does aerobic respiration occur

A

mitochondria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

process of gas exchange

A

nose = larynx = trachea = bronchus = bronchiole = alveoli

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

rings of cartilage funcction

A

strengthen trachea to prevent it from collapsing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

breathing

A

movement of gases into and out fo the lungs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

alveolus adaptions

A
  1. large network of capillaries (allows oxygen to diffuse into blood capillaires)
  2. moist surface (allows oxygen to dissolve and make it easier for oxxygen to diffuse into cell
  3. larger surface area (many diffusions can happen at the same time)
  4. thin walls (oxygen easier to pass through)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

During Inhalation
Intercostal muscles…
Rib cage…
Diaphragm…
Volume of thoracic cavity…
Air pressure in thoracic cavity…

A

Intercostal muscles contracts
Rib cage move upwards and outwards
Diaphragm contracts and flattened
Volume of thoracic cavity is larger
air pressure decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Plasms function

A

transport blood cells, nutrients, carbon dioxide, glucose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

RBC function

A

transportating oxygen from the lungs to all the respiring cells in the body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

WBC function

A

prtoect against pathogens that have got into the body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Anaerobic respiration definition

A

a process that produces energy without the need of oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Anaerobic respiration formula in humans

A

glucose=lactic acid+energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Anaerobic respiration formula in microorganisms

A

glucose=ethanol+carbon dioxide+energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

RBC has 5 special features. what are they?

A

1 has haemoglobin (carries oxygen)
2 very small (can squeexe through capillaries)
3 no nucleus (more room for haemoglobin so can carry more oxygen)
4 no mitochondria (does not carry out respiration and use up the oxygen
5 biconcave shape (larger surface area)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

WBC use two ways to kill pathogens. what are they?

A
  1. produce chemicals called antibodies, which attach themselves to the pathogens and kill them
  2. kill pathogens by taking them into their cytoplasm and digesting them
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

phagocytosis

A

kill pathogens by taking them into their cytoplasm and digesting them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

if the expired air turns cloudy, presence of carbon dioxide is detected. is this true of false?

A

so damn true im so smart

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Solution definition

A

A mixture of solute and solvent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

solvent defi

A

liquid used to dissolve other substances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

solute

A

substance that dissovles in the solvent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what is the universal solvent

A

water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

what is the difference between melting and dissolving

A

melting needs only one substance while dissolving requires two substances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

what is the principle of conservation of mass

A

mass of solut+mass of solvent=mass of solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

ways to dissolve solute faster

A

1 grinding (increase surface area)
2 stirring (increase contact between solute and solvent)
3 heating (increase particle energy and speeds up dissolving)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

transparent meaning

A

can see through

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

opaque meaning

A

cannot see through

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

when sugar melt in to water, is it still there?

A

when the salt is dissovled in the water, it does not disappear. it is still in the water, although you cannot see it. according to the principle of conservation of mass…

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

insoluble

A

a substance that will not dissolve in water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

soluble

A

substance that dissolves in water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

solubility

A

maximum amount of solute that can dissolve in 100g of solvent at a certain temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

factors affecting solubility

A

concentration of the solute
temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

oil paint dissolves in…

A

methanol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

nail polish dissovles in…

A

temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

paper chromatography steps

A

a small drop of blank ink is placed on paper
the paper is dipped in water
water moves up, separates the ink

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

chromatogram defi

A

the resulting pattern of separated colours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

ink separates because of solubility. the. more soluble, the inks travel…

A

further

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

inks insoluble in water require other solvents like…

A

alcohol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

Why do you use a line drawn in pencil on the paper?

A

to show where the spot of dye should be placed. pencil is used because it will not dissolve and interefere with the results

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

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

A

so that the ink does no tdissolve into the water in the beaker

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

what must you remove the strip before water reaches the end?

A

so that the different colours in the ink could be separated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

why dry the drops of liquid before adding more?

A

so that the small spot of liquid would be more concentrated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

how was liquid separated in paper chromatography

A

1 the liquid dissolves in the solvent,
2 the different substances in the liquid dissolves at different rates in the solvent.
3 as the solvent moves up the paper, the solutes are carried up with it.
4 the more soluble substance will be carries further than the less soluble one.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

Gold foil experiment
Nucleus carries most mass:
Atom mostly empty space:
Got nucleus:
Nucleus is positive:

A

Nucleus carries most mass: ocassionally, alpha particle travels back from the foil
Atom mostly empty space: most particles passed straight through the foil
Got nucleus: some particles deflect as if they hit something
Nucleus is positive: particles deflect as they are repelled by the nucleus which is positively charged

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

mass of electron

A

1/1836

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

conclusion of gold foil experiment and date

A

gold atmos must be mostly empty space, with their particles packed into a dense nucleus at the centre, 1911`

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

There is __________- between protons and electrons

A

electrostatic attraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

Who discovered neutrons

A

james chadwick

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

who discovered electrons

A

jj thompson

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

who discovered protons

A

rutherford

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

conclusion of the plum pudding model

A

atom was a positively charged sphere with negative electrons in it like chips

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

Diamond is made out of ____ and is _____

A

carbon, translucent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

what do neutrons do

A

stabilize the atom’s nucleus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

pure element defi

A

contains only one type of atom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

what do you add to make diamond blue

A

boron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

what do you add to make diamond yellow

A

nitrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

what do you add to make diamond green

A

nitrgoen, nickel, hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
66
Q

sea salt equals to

A

sodium chloride

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

temperature

A

how hot it is

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

humidity

A

how much water vapour there is in the atmosphere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
68
Q

precipitatoion

A

rain, hail, or snow whcih falls from the clouds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
69
Q

what is added to gold

A

copper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
70
Q

visibility

A

how far you can see, depends on the atmospheric condition or darkness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
71
Q

meteorology

A

study of weather

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
72
Q

climatology

A

study of climate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
73
Q

climate zones

A

polar
temperate
arid
mediterranean
tropical
mountain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
74
Q

temperature in the zones
polar
temperate
arid
mediterranean
tropical
mountain

A

polar: cold and dry
temperate: cold win, mild sum
arid: hot and dry
mediterranean: mild win, hot sum
tropical: hot and wet
mountain: very cold

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
75
Q

what is an ice age

A

period where there is permanent ice on earth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
76
Q

how many ice ages are there

A

5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
77
Q

why are there lesser carbon dioxide

A

phtosynthesis
carbon locked up in fossil fuels
carbon locked up in sedimentary rocks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
78
Q

why carbon dioxide increase

A

burning fossil fuels to provide for industry adn transportatino
deforestation
farming, cattle produce co2 in there intestine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
79
Q

weather xefi

A

short term atmospheric ccondition of a small area from minute to minute, hour to hour, day to day

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
80
Q

climate defi

A

average weather over a large area for a much longer time, usually at least 30 years

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
81
Q

why do meteorologists record the weather in so much detail

A

looking for patterns to see if they can predict what happen in the future, important for agriculture and transportation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
82
Q

why is weather in ice land usually changeable

A

it is an island in the middle of the ocean and a long way from any other land. the winds and weather system move quickly in this area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
83
Q

non-renewable energy eg

A

coal, petrol, natural gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
84
Q

bioplastic defi and eg

A

plastic made of renewable biomass source
vegetable oil, corn starch, saw dust, fppd waste

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
85
Q

peat bog oldest is from the…

A

bottom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
86
Q

why does the peat bog not rot

A

acidic, no oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
87
Q

what evidence atmospher has changed over time

A

iron oxide formed in rocks
pockets of anicent air trapped in ice cores

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
88
Q

what ideas to support global warming

A

ice at poles and glaciers are melting
sea level is rising

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
89
Q

is earth in an ice age

A

yes. there are still permanent ice at the poles and mountains and glaciers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
90
Q

difference between ice age and glacial period

A

ice age is when there is permanent ice somewhere one arth. in ice age, there are periods when most of the earth is frozen. that is glacial period

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
91
Q

is earth in glacial period

A

no. wer are in an interglacial period with ice only at the poles, some mountains and glaciers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
92
Q

how do scientists know earth was colder in the past

A

boulders left behind by glaciers
fossil of animals and plants that live in cold places
pollen from peat bog by using auger

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
93
Q

sedimentary rocks chemical formula

A

calcium oxide+carbon dioxide = calcium carbonate

94
Q

greenhouse effect defi

A

heat energy from the sun is trapped in atmosphere

95
Q

greenhouse effect eg

A

co2, water vapour, methane

96
Q

global warming

A

increase in overall temperature of the earth’s temperature over time

97
Q

how do tides produce electricity

A

tides flow in an out the generator, when it is high tide, it spins the turbine, creating electricity

98
Q

bioplastic eg

A

seaweed, saw dust, food waste

99
Q

what is balanced forces

A

two forces are the same and in opposite directions

100
Q

what is unbalanced forces

A

two forces are different sizes or in same direction

101
Q

what is air resistance

A

the opposing force to an object moving through the air

102
Q

speed formuka

A

distance/time

103
Q

moment

A

forcexdistance

104
Q

what is distance time graphs

A

show object’s speed and movement patterns

105
Q

what is pressure

A

thrust acting per unit area

106
Q

pressure formu;a

A

force/area

107
Q

pressure increases when you….

A

reduce contact area

108
Q

liquid pressure inceeases…

A

with depth

109
Q

moment defi

A

turning effect of a lever

110
Q

higher ____ gas particles _______ weight of air ______, atmospheric ppressure _____

A

altitude, decrease, decrease, decrease

111
Q

diffusion defi

A

movement of particles from a region of high concentration to a region of low concentration

112
Q

a balloon is sealed so air cannot escape
what will happen to the pressure inside if the temperature decrease?

A

pressure decrease. the air particles move slower at lower temperature, thus they collide with the walls of container less often

113
Q

this man lies on nails. why no pain?

A

weight of man acting on hundreads of nails, os pressur esmall

114
Q

why does the water eventually turn blue

A

the ink particles diffuse throughtout the water

115
Q

why faster diffusion when tempt higher>

A

particles more energy, more faster

116
Q

why brown gas become less intense as it further away the container

A

brown gas diffuse from an area of high concentration, where particles are close, so colours is darker. when particles diffuse to an area of lower concentration, there are less particles and they are further apart

117
Q

smell (diffusion)

A

concentration of particles

118
Q

the bottle fatty experiment

A

pressure outside greater than inside

119
Q

diffusion factors

A

cnocentration
temperatureh

120
Q

how does pressure cooker work

A

it has a sealed lid. water boils, steam in cooker cannot escape. gas pressure increase, tempt increase

121
Q

adaptions of cactus
the roots:
no leaves:
sharp spines:

A

the roots: spread out widely to capture water
no leaves: no water loss in transpiration
sharp spines: prtoect from being eaten by animals

122
Q

why cactus cannot grow in cold places>

A

cells ar ekilled if they freeze

123
Q

cactus cannot grow in wetter areas because….

A

they cannot compete with other plants that are specifically adapted to survive in wetter areas

124
Q

cactus dont have leave, they make food using———-

A

green stems

124
Q

thermal means

A

heat

125
Q

hydro means

A

water

125
Q

vent means

A

an opening that things can pass through

126
Q

why plants cannot grow at hydrothermal vent?

A

there is no light and it is too hot

127
Q

instead of sunlight, bacteria use ________ to make food

A

energy in the chemicals dissolved in hot water

128
Q

give two habitats of the bacteria at hydrothermal vent

A

giant tube worms, in hot water around the vent

129
Q

mangrove roots help to support them in the _____ in _________ regoins

A

mud, tropical

130
Q

mangrove ecosystem provides habitats for many animals because

A

the mangrove roots provide shelter

131
Q

fish die because no mangrove, why?

A

no safe habitat to develop safely from predators

132
Q

beavers live in ________ in north america. they are the _______ species in north america

A

streams and rivers, native

133
Q

why were beaves brought to south america

A

to breed for their fur

134
Q

who are beavers killed by

A

brown bears

135
Q

how do south america control the number of water hyacinths

A

introduce herbivores to stop the growing number

136
Q

water hyacinths quickly become inavasive species. why?

A

no predators

137
Q

how the water hyancinths kill native plants and fish

A

make a thick covering so that light and oxygen cannot reach the water belwo

138
Q

how water hyancinths cause difficultry for fishermen to make a liiivng

A

unable to catch fish because fishing boat cannot move through

139
Q

why number of cane toad increase

A

predators that eat cane toads die due to poison

140
Q

one example of predator that eat ccane toade

A

northern quoll

141
Q

bromeliads grow on tall trees. list advantages

A

get more sunlight
prevent being eaten by toehr organisms

142
Q

bromeliads have spiky leaves arranged in circles which trap water. suggest adavnatages

A

protected from predators
supply water for small animals

143
Q

vitamin a defiency

A

night blindness

144
Q

protein function

A

growth of new cells

145
Q

fat and oil function

A

energy and insulation

146
Q

carbo function

A

use in respiration to release energy

147
Q

vitamin a function

A

help with night vision

148
Q

vitamin c function

A

keeps skin strong

149
Q

vitamin d function

A

sunlight

150
Q

calcium function

A

for strong bones and teeth

151
Q

iron function

A

to make haemoglobin

152
Q

water function

A

a solvent for many different chemicals

153
Q

fibre function

A

provide bulk for faeces
prevent constipation

154
Q

protein source

A

meat and fish

155
Q

fat and oil source

A

avacado, seeds, nuts

156
Q

carbo source

A

rice, bread, grain

157
Q

vitamin a source

A

green vege, carrats, dairy products

158
Q

vitamin c source

A

orange, lemon, guava

159
Q

vitamin d source

A

help to absob calcium

160
Q

calcium source

A

dairy products, seeds

161
Q

iron source

A

red meat, liver, fish liver oil

162
Q

vitamin a deficiency

A

nnight blindness

163
Q

vitamin c deficiency

A

scurvyc

164
Q

calicum defiency

A

rickets

165
Q

iron deficiency

A

anaemia

166
Q

fibre deficiency

A

constipation

167
Q

the excess carbo will be turned into _________ to be stored in ________

A

glycogen, lliver and muscles

167
Q

which nutrients provide energy

A

carbo, fat, protein

168
Q

what is a balanced diet

A

a diet in whcih the food contains all kinds of nutrients the correct amount

169
Q

what is peristalsis

A

the moevement of food along the digestive tract

170
Q

the moevement of food along the digestive tract

A

peristalsis

171
Q

fertilisation

A

the fusion of a sperm and an ovum

172
Q

the fertilized egg known as ________ is then divided into a ball of cells which is called ______

A

zygote, embryo

173
Q

give 2 reasons why water is important to our body

A

water removes excretory waste like urea
water regulates our body’s temperature

174
Q

nictoine

A

addictive

175
Q

carbon monoxide

A

competes with oxygen to combine with haemoglobin

176
Q

particulates

A

oxygen is difficult to diffuse through the alveolus

177
Q

tar

A

cause lung cancer

178
Q

cigarrete has….

A

nicotine
carbon monoxide
particulates
tar

179
Q

to straighten the arm, the biceps _______, the triceps ____

A

relax, contract

180
Q

eg of ball and socket joint

A

shoulder joint

181
Q

movement of ball and socket joint

A

circular motion

182
Q

eg of hinge joint

A

knee joint

183
Q

movement of hinge joint

A

go one direction, back and forward

184
Q

which bone is the triceps attached to

A

humerus, ulna, radius

185
Q

antagonistic muscles defi

A

a pair of muscles which work oppositely

186
Q

3 factors affefcting our diet requirements

A

gender
occupation
pregnancy and lactation

187
Q

how do reduce heat loss from the tet tube

A

wrap the test tube with cotton

188
Q

magnesium and sulfurci acid

A

magnsium sulfate hydrogne

189
Q

the stuff used to abosrb water

A

calcium chloride

189
Q

how do you test for hydrogen

A

test with a lighted splint, a squeaky pop sound will be heard

190
Q

why is copper used for roofs and not magnesium

A

magnesium reactive with water

190
Q

potasssium and water covert to what eneegy

A

thermal energy, light energy, sound energy

191
Q

magnesium steam

A

mangsium oxide hydrogen

192
Q

what is magnetic field

A

A magnetic field is the area around a magnet where magnetic forces can be felt.

193
Q

describe how you could use a magnetic compass to detect a magnetic field

A

Place the compass near the magnet; the needle will align itself along the magnetic field lines, showing the direction of the field.

194
Q

describe how a piece of paper and iron filings could be used to show the pattern of the magnetic field between two south poles of different magnets

A

Place the paper over the magnets and sprinkle iron filings. The filings will show the pattern of the magnetic field, which will show the lines pushing apart between the two south poles (repelling).

195
Q

two applications of electromagnets

A

mri scanner
toaster

196
Q

two changes to the electromagnet that would make the pointed end of the nail become south/north pole

A

Reverse the direction of the wire coil around the nail.
Reverse the connection to the power supply.

196
Q

when switch close, end of the dails can detect pins. why

A

Closing the switch allows current to flow through the coil, magnetizing the nail, which attracts pins.

197
Q

when switch open, pin fall off the nail. why

A

Opening the switch cuts the current, demagnetizing the nail, causing it to lose its magnetic properties and release the pin.

197
Q

how can marcus test whether the pointed end of the nail behaves as a north pole or as a south pole

A

Bring a known north pole of a magnet near the pointed end. If it repels, the pointed end is a north pole; if it attracts, it is a south pole.

197
Q

two advantages of using an adjustable power supply

A

Control the strength of the electromagnet.
Prevent overheating by limiting current.

198
Q

what happens to the reading on the digital balance when the electromagnet is switched on

A

The reading increases as the electromagnet attracts the object on the balance.

199
Q

if the connection from the electromagnet to the power supply is reversed, then the change in readings on the balance will also be reversed

A

The change in readings will be reversed because the polarity of the electromagnet changes, affecting the attraction or repulsion.

200
Q

habitat

A

a place where an organism lives

201
Q

ecology

A

study of ecosystem

202
Q

food web

A

tyoe of interaction between the living organisms

203
Q

native species

A

found in a certain ecosystem due to natural distribution

204
Q

ddt

A

an insecticide which kills insects such as mosquitoes that transmit malaria

205
Q

what does it mean by ddt is persistent chemical

A

vnnot be broken down by decomposers

206
Q

ppm

A

parts per million

207
Q

what do you do to magnetize a magnet

A

use the same pole of a magnet and stroke a steel bar with the magnet in the same direction

208
Q

what do you do to demagnetize a magnet

A

heat it, drop it, hit it

209
Q

how to determine poles of a manet

A

use compass. if it pooints towards the end of the bar, its south, if it points away, it is north

bring the north pole of a bar magnet to the end of the bar, if it attracts, its south, repel, north

210
Q

dispersion

A

the splitting of light into its componetnts

211
Q

three types of galaxies

A

spiral
elliptical
irregular

212
Q

asteroids

A

object made from rocks that orbit the sun

213
Q

milky way shape

A

spiral

214
Q

closest galaxy to milky way and its shape

A

caniis major dwarf, elliptical

215
Q

name of the glaaxy closest

A

milky way

216
Q

the weird small shit

A

itokawa

217
Q

why smaller asteroids impact earth frequently

A

earth exerts strong gravity force on passing objects
orbits are close to earth

218
Q

why a permanent maagnet is not suitable for the applications of electromagnet

A

cannot be swtiched on and off

219
Q

name teh piece of equipement that is used for navigation using the earth’s magnetic field

A

magnetic compass

220
Q

name the magnetic metal that makes up most of the earth structure that causes the earth’s magnetic field

A

iron and nickel

220
Q

a bar magnet is alllowed to rotate freely. explain which pole of th ebar magnet with point towards geograpphic north

A

The north pole of a freely rotating bar magnet points towards geographic north because it is attracted to the Earth’s magnetic south pole, which is located near the geographic north pole.

221
Q

what part of the earth structure causes the earth’s magnetic field

A

core

222
Q
A
222
Q

state the relationship between the direction of the magnetic field lines and the direction that a magnetic ompass will point

A

The magnetic compass needle points in the direction of the magnetic field lines, with the north end of the compass needle aligning with the direction of the magnetic field lines emanating from the north pole of a magnet.

Science Finals (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions