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Science(Mixed) Flashcards

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1
Q

sound waves are

A

Longitudinal

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2
Q

wave speed=

A

Frequency*wavelength

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3
Q

an organism is a

A

living thing

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4
Q

differing animals depending on each other is called

A

interdependence

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5
Q

bioaccumulation is

A

poison building up across a food chain

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6
Q

DDT was a poison from

A

1950 to 1984

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7
Q

it caused

A

cancer in humans and brittle bones in birb

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8
Q

filtration

A

seperates insoluble materials from liquids

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9
Q

this forms a

A

residue

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10
Q

soluble substances can be seperated with

A

evaporation

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11
Q

litmus is made from

A

lichen

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12
Q

Who discovered the structure of DNA?

A

James Watson, Maurice Wilkins, Rosalind Franklin and Francis Crick

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13
Q

the four bases in DNA are

A

Guanine, adenine, thynine, cytosine

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14
Q

the hierarchy of groups is

A

Kingdom, Phylum, Class, Order, Family, Genus, Species

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15
Q

Plant and Algal cells have

A

A cell wall, permanent vacuole and chloroplasts

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16
Q

in human cells, there are ____ pairs of chromasomes

A

23

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17
Q

Real size =

A

Image size/magnification

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18
Q

Magnification =

A

Image size/real size

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19
Q

1 meter =

A

1000 milimeters

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20
Q

1 millimeter =

A

1000 micrometers

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21
Q

1 micrometer =

A

1000 nanometers

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22
Q

when a plant cell fills with water it grows

A

turgid

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23
Q

when an animal cell fills with water it

A

bursts

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24
Q

when an animal cell loses water it

A

shrivels

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25
when a plant cell loses water it
becomes flaccid
26
when a plant cell loses all water it becomes
plasmolysed
27
most metals are found with other in rocks called
ores
28
bacteria can divide every
20 minutes
29
bacteria can be grown in
nutrient broth qand agar plates
30
a hypotonic solution means
less dilution outside
31
if a cell is placed into a hypotonic solution, what happens?
it bursts
32
metals are made up of layers of positive
ions
33
the free electrons carry
current through metal
34
the differing sizes of ions in alloys prevent
sliding
35
metal oxides are
bases
36
you can tell metals have rusted as they will be
tarnished
37
metal + water ->
Metal oxide+ hydrogen
38
Oxidising materials (such as group 1 metals) are stored in oil to
prevent oxidisation
39
to stop oxygen from getting to the metal, people use
Galvanising, painting, oiling and plating
40
hydrogen is indentified by a
pop test
41
this is done by using a
lit wooden splint
42
metals replace the _____ in a compound, forming a ____
hydrogen, salt
43
Work done is measured in
Joules
44
Force is measured in
newtons
45
Distance is measured in
meters
46
wheels reduce _____, whilst levers and pulleys increase ______
friction, distance
47
the more force applied to a spring, the greater the extention, until the_______
elastic limit
48
the elastic limit is the limit at which
warping begins
49
the force is applied by the
master piston
50
this force is applied by the
slave piston
51
the pressure exerted from the master piston equals
force/area
52
the force exerted by the slave piston equals
pressure*area
53
gamma rays have a wavelength of
less than 1nm
54
gamma rays cause
ionisation
55
gamma rays have a frequency of
3*10^17 htz
56
x rays have a frequency of
3*10^16-17
57
x rays have a wavelength of
1-10 nm
58
UV rays have a frequency range of
8*10^14-3*10^16
59
UV rays have a wavelength of
400-10nm
60
Visible light has a wavelength from
700-380nm
61
Visible light has a frequency range of
4*10^14-8*10^14
62
Infrared radiation has a wavelength from
1mm-700nm
63
infrared has a frequency range of
3*10^11-14
64
microwaves have a wavelength from
1m-1mm
65
microwaves have a frequency range of
3*10^8-11
66
radio waves have a frequency range of
3*10^5-8r
67
radio waves have a wavelength from
1km-1m
68
longitudinal waves are where the partices vibrate
paralles to energy transfer
69
transverse waves are where the particles vibrate
perpendicular to energy transfer
70
hydrocarbons can be cracked to produce
smaller molecules
71
the alkane formula is
CnH2n+2
72
alkanes are
aturated molecules
73
the formula for alkenes is
CnH2n
74
The first four members of alkanes are
Methane, Ethane, Propane, Butane
75
Alkenes skip
Methene
76
the suffix for alcohols is
anol
77
The structure of DNA was discovered in
1953
78
79

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