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SP-STEM5 > WEEK06A > Flashcards

WEEK06A Flashcards

1
Q

origin of the word atom

A

atomos

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1
Q

who proposed the name atom

A

democritus

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2
Q

what does atomos mean

A

indivisible or uncuttable

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3
Q

what is the idea of democritus that was not accepted by many greek philosophers plato and aristotle

A

atomism

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4
Q

published the sceptical chymist- stated that the element is the simplest form of matter, can be combined to be compound

A

robert boyle

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5
Q

robert boyle year

A

1661

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6
Q

uses dephlogisticated air by heating mercury oxide (HgO)

A

joseph priestley

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7
Q

joseph priestley year

A

1774

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8
Q

who discredited the concept of joseph priestley

A

antoine-laurent lavoisier

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9
Q

who formulated the law of conservation of mass

A

antoine-laurent lavoisier

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9
Q

what is the law of conservation of mass

A

matter can be neither created nor destroyed

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9
Q

the law which states that in a chemical reaction, the mass of substances produced is equal to the mass of the substances reacted

A

law of conservation of mass

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9
Q

in chemical reactions, atoms are only rearranged

A

true

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10
Q

1st law of matter

A

law of conservation of mass

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11
Q

antoine-laurent lavosier year

A

1774-1778

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12
Q

states that any sample of a given compound will always be composed of the same elements in the same proportion by mass

A

law of definite proportion

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13
Q

who stated the law of definite proportions

A

joseph-louis proust

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14
Q

joseph-louis proust year

A

1788

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15
Q

2nd law of matter

A

law of definite proportion

16
Q

3rd law of matter

A

law of multiple proportion

17
Q

who stated the law of multiple proportion

A

john dalton

18
Q

states that mass can be reduced to a whole number

A

law of multiple proportions

19
Q

states that diff. samples of the same compound always contain its constituent elements in the same proportion by mass

A

law of definite proportions

20
Q

states that if two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in ratios of small whole numbers. e.g. 1:1, 1:2

A

law of multiple proportions

21
Q

john dalton year

A

1808

22
Q

he formulated the first atomic theory

A

john dalton

23
Q

elements are composed of extremely small particles called atoms

A

boyle’s

24
Q

all atoms of a given element are identical, having the same size, mass, and chemical properties. the atoms of one element are different from the atoms of all other elements

A

proust’s law of definite proportion

25
Q

compounds are composed of atoms of more than one element

A

john dalton’s law of multiple proportion

26
Q

a chemical reaction involves only the separation, combination, or rearrangement of atoms; it does not result in creation nor nor destruction

A

lavoisier’s law of conservation of mass

27
Q

this theory became one of the foundations of modern chemistry

A

law of multiple proportions

28
Q

he started working on the cathode ray experiment
cathode-anode
cat ray tube

A

joseph john thomson

29
Q

what model is created by joseph john thomson

A

plum-pudding model

30
Q

unit for charge

A

coulomb (C)

31
Q

plum-pudding model is ____ charged to make atom ___
like raisins in a pudding

A

positively, neutral

32
Q

formula for atomic structure ratio

A

ratio = qe/me = -1.76 x 10^11 C/kg

33
Q

they conducted the oil drop experiment to determine the charge of an electron

A

robert millikan and harvey fletcher

34
Q

oil drop experiment year

A

1909

35
Q

discovered the charge of an electron

A

robert millikan

36
Q

formula for oil drop experiment qe

A

1e = -1.602 x 10^-19 C

37
Q

which is heavier, proton or electron

A

proton

38
Q

he noticed that cathode rays caused glass and metals to emit highly energetic radiation. called x-ray

A

wilhelm röntgen

39
Q

he found that exposing thinkly wrapped photographic plates to a certain uranium compound caused them to darken, even without the stimulation of cathode rays

A

antoine becquerel

40
Q

suggested the name radioactivity

A

marie curie

41
Q

a former student of thomson, performed the gold foil experiment with the hypothesis that alpha rays should pass through the plum-pudding like structure of the gold atoms

A

ernest rutherford

42
Q

mass of an electron formula

A

Me = qe/ratio = -1.602 x 10^-19 C/ -1.76 x 10^11 C/kg

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