WEEK06A

Question 1

origin of the word atom

Answer 1

atomos

Question 1

who proposed the name atom

Answer 1

democritus

Question 2

what does atomos mean

Answer 2

indivisible or uncuttable

Question 3

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

Answer 3

atomism

Question 4

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

Answer 4

robert boyle

Question 5

robert boyle year

Answer 5

1661

Question 6

uses dephlogisticated air by heating mercury oxide (HgO)

Answer 6

joseph priestley

Question 7

joseph priestley year

Answer 7

1774

Question 8

who discredited the concept of joseph priestley

Answer 8

antoine-laurent lavoisier

Question 9

who formulated the law of conservation of mass

Answer 9

antoine-laurent lavoisier

Question 9

what is the law of conservation of mass

Answer 9

matter can be neither created nor destroyed

Question 9

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

Answer 9

law of conservation of mass

Question 9

in chemical reactions, atoms are only rearranged

Answer 9

true

Question 10

1st law of matter

Answer 10

law of conservation of mass

Question 11

antoine-laurent lavosier year

Answer 11

1774-1778

Question 12

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

Answer 12

law of definite proportion

Question 13

who stated the law of definite proportions

Answer 13

joseph-louis proust

Question 14

joseph-louis proust year

Answer 14

1788

Question 15

2nd law of matter

Answer 15

law of definite proportion

Question 16

3rd law of matter

Answer 16

law of multiple proportion

Question 17

who stated the law of multiple proportion

Answer 17

john dalton

Question 18

states that mass can be reduced to a whole number

Answer 18

law of multiple proportions

Question 19

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

Answer 19

law of definite proportions

Question 20

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

Answer 20

law of multiple proportions

Question 21

john dalton year

Answer 21

1808

Question 22

he formulated the first atomic theory

Answer 22

john dalton

Question 23

elements are composed of extremely small particles called atoms

Answer 23

boyle’s

Question 24

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

Answer 24

proust’s law of definite proportion

Question 25

compounds are composed of atoms of more than one element

Answer 25

john dalton’s law of multiple proportion

Question 26

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

Answer 26

lavoisier’s law of conservation of mass

Question 27

this theory became one of the foundations of modern chemistry

Answer 27

law of multiple proportions

Question 28

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

Answer 28

joseph john thomson

Question 29

what model is created by joseph john thomson

Answer 29

plum-pudding model

Question 30

unit for charge

Answer 30

coulomb (C)

Question 31

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

Answer 31

positively, neutral

Question 32

formula for atomic structure ratio

Answer 32

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

Question 33

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

Answer 33

robert millikan and harvey fletcher

Question 34

oil drop experiment year

Answer 34

1909

Question 35

discovered the charge of an electron

Answer 35

robert millikan

Question 36

formula for oil drop experiment qe

Answer 36

1e = -1.602 x 10^-19 C

Question 37

which is heavier, proton or electron

Answer 37

proton

Question 38

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

Answer 38

wilhelm röntgen

Question 39

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

Answer 39

antoine becquerel

Question 40

suggested the name radioactivity

Answer 40

marie curie

Question 41

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

Answer 41

ernest rutherford

Question 42

mass of an electron formula

Answer 42

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