science keywords Flashcards

1
Q

natural science

A

the study of the natural world

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2
Q

two types of natural sciences

A

physical science and biological science

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3
Q

physical science

A

deals with inanimate (non living things)

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4
Q

subjects of physical science

A

physics, chemistry, astronomy, geology and computer science

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5
Q

biological science

A

deals with living things

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6
Q

two types of biological science

A

botany and zoology

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7
Q

botany

A

the study of plants

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8
Q

zoology

A

the study of animals

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9
Q

hypothesis

A

a proposed explanation of why certain events take place

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10
Q

theory

A

is an explanation of observations and is bases on hypothesis, laws and facts

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11
Q

scientific law

A

a description of observed occurrences and is based on repeated experiments

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12
Q

primary data

A

collected by the researcher themselves

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13
Q

secondary data

A

data that has not been collected by the scientist themselves

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14
Q

cell

A

smallest working unit of a living thing

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15
Q

organism

A

the name given to any living thing. for example, both plants and animals are organisms

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16
Q

multicellular

A

organisms made up of 2 or more cells

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17
Q

unicellular

A

organisms made up of only one cell

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18
Q

tissue

A

a group of cells of the same type working together to do a particular job

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19
Q

organ

A

a group of tissues working together to carry out a function

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20
Q

system

A

a number of organs working together to carry out a function

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21
Q

the seven characteristics of life

A

movement
reproduction
growth
response
respiration
excretion
nutrition

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22
Q

animal cell

A

has mitochondria, cytoplasm, cell membrane, nucleus, ribosome

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23
Q

plant cell

A

has mitochondria, cytoplasm, cell membrane, nucleus, ribosome, cell wall, chloroplast and large vacuole

24
Q

parallex error

A

make sure when you are taking a measurement that you eye is directly over the number on the scale so that you take and accurate reading

25
Q

oesophagus

A

carries food from the mouth to the stomach

26
Q

stomach

A

churns food
adds hydrochloric acid to food
chemically digests food
has villi for absorbtion

27
Q

pancreas

A

makes enzymes to digest food

28
Q

liver

A

produces bile to aid in fat digestion

29
Q

gall bladder

A

stores bile until it is needed in the small intestine

30
Q

small intestine

A

7 meters long
digests food and absorbs food into the bloodstream

31
Q

large intestine

A

stores undigested food for egestion
made up of 2 parts:
colon
rectum

32
Q

rectum

A

stores faces for egestion

33
Q

colon

A

absorbs water from food into the blood

34
Q

anus

A

allows faeces to pass from the body

35
Q

appendix

A

no longer has a function

36
Q

digest

A

to break down large food particles into smaller soluble particles

37
Q

mechanical digestion

A

physically breaking down food. for example, chewing

38
Q

chemical digestion

A

breaks down food chemically. example, enzymes in the salivary glands

39
Q

incisors

A

cuts and slices food

40
Q

canines

A

grips and tears food

41
Q

molars

A

chews and grinds food

42
Q

premolars

A

chew and grind food

43
Q

wisdom teeth

A

chew and grind food
often removed as they are not needed

44
Q

density

A

how much matter is inside the same volume. eg, 1m3 of styrofoam is less dense than 1m3 of water

45
Q

melting point

A

the temperature at which a solid changes to a liquid

46
Q

boiling point

A

the temperature at which a liquid changes to a gas

47
Q

freezing point

A

the point where a liquid turns back into a solid

48
Q

condensation

A

when a gas changes into a liquid

49
Q

molecule

A

made up of 1 or more atom. they can be the same or different atoms

50
Q

atoms

A

smallest part of a chemical element that can exist

51
Q

element

A

substance that only contains one type of atom

52
Q

compound

A

a substance that is made up of 2 or more different elements that are chemically combined (joined together). compounds contain 2 or more different types of atoms joined together by chemical bonds

53
Q

element

A

substance that only contains one type of atom

54
Q

mixture

A

two or more different substances mingled with each other but not chemically combined

55
Q

physical change

A

when the atoms form in a new way to give us a mixture by do not create a new substance

56
Q

chemical change

A

when atoms arrange in a different way to give us a new substance called a compound

57
Q

evaporation

A

the changing of a liquid to gas at the surface of the liquid