Atoms Quiz

Question 1

Democritus (major contribution including specific experiment)

Answer 1

-prove the existence of atoms
-theorized atoms were tiny and indivisable
-atomos

Question 2

Democritus (model)

Answer 2

atomic model (just a circle)

Question 3

Democritus (how it changed from the previous model)

Answer 3

first atomic model created

Question 4

Dalton (major contribution including specific experiment)

Answer 4

Daltons 4 part theory:
1.All Matter is Composed of Atoms (false)
2. Atoms of a Given Element are Identical (false)
3. Compounds are Formed by Combining Atoms (true)
4. Chemical Reactions Involve Rearrangement of Atoms (true)
-nitric oxide experiments

Question 5

Dalton (Model)

Answer 5

Billard Model just a circle

Question 6

Dalton (how it changed from the previous model)

Answer 6

model didn’t change but the understanding did

Question 7

Thompson (major contribution including specific experiment)

Answer 7

-discovered the electron
-did this using the cathode ray tube experiment
-proposed atoms are not inadvisable

Question 8

Thompson (model)

Answer 8

The plum pudding model. Was a circle with electrons suspended in it.

Question 9

Thompson (how it changed from the previous model)

Answer 9

said there were smaller particles inside an atom

Question 10

Rutherford (major contribution including specific experiment)

Answer 10

-used the gold foil experiment
-atom mass is in the tiny positively charged center
-discovered the proton

Question 11

Rutherford (Model)

Answer 11

nuclear model. was a circle with positively charged protons in the middle and electrons on the outside

Question 12

Rutherford (how it changed from the previous model)

Answer 12

electron is orbiting around the positively charged center

Question 13

Bohr (major contribution including specific experiment)

Answer 13

-electrons orbit the nucleus at fixed energy levels
-light come when electrons jump levels
-built on the gold foil experiment

Question 14

Bohr (Model)

Answer 14

Bohr model (planetary model). Kind of like the model we now use.

Question 15

Bohr (how it changed from the previous model)

Answer 15

electrons only orbit at fixed levels

Question 16

Chadwick (major contribution including specific experiment)

Answer 16

-discovery of the neutron
-also discovered that it was neutral
-beryllium experiment

Question 17

Chadwick (Model)

Answer 17

Chadwick model. It had neutrons and protons in the nucleus.

Question 18

Chadwick (how it changed from the previous model)

Answer 18

built on the Rutherford model. added neutron the the nucleus.

Question 19

Order of atomic discoveries names

Answer 19

Democritus, Dalton, Thompson, Rutherford, Bohr, Chadwick

Question 20

Conservation of mass

Answer 20

whenever matter changes, the total mass of the products of the change is the same as the total mass of the reactants.

Question 21

Law of Definite proportions

Answer 21

every chemical compound contains fixed proportions (by mass) of its constituent elements. (ex. table salt at home is the same as table salt at school)

Question 22

What holds the nucleus together

Answer 22

strong nuclear force

Question 23

what keeps the electrons in orbit

Answer 23

electromagnetic force

Question 24

weight of proton

Answer 24

1 AMU

Question 25

weight of neutron

Answer 25

1 AMU

Question 26

weight of electron

Answer 26

0 AMU

Question 27

AMU=

Answer 27

atomic mass unit

Question 28

about amu’s

Answer 28

-1 AMU is very close to the mass of a p or n
-but not quite (the atomic mass has electrons in it too)

Question 29

what is the atomic number

Answer 29

the number of protons in an element. it defines the element

Question 30

what does the atomic number mean in a neutral atom

Answer 30

it means it is the number of electrons

Question 31

what is the mass number

Answer 31

mass number is the total protons and neutrons in an atom. It goes above the letter in nucleur notation and is after the hyphen in hyphen notation. you can also round the decimal under the letter to get

Question 32

what are isotopes

Answer 32

they are atoms of the same element with different numbers of neutrons

Question 33

Nuclear Notation

Answer 33

mass # is above then the symbol them the atomic number is below

Question 34

what does an ion look like

Answer 34

a + or - number with the element symbol

Question 35

ion

Answer 35

gained or lost and electron

Question 36

if you gain an electron

Answer 36

it becomes smaller because electrons are negative

Question 37

if you lose an electron

Answer 37

it becomes bigger because electrons are negative

Question 38

Hyphen Notation

Answer 38

another way to label isotopes. carbon-14. means that this carbon has a mass number of 14

Question 39

electrons (what we know)

Answer 39

-electrons further from the nucleus have a higher energy
-further levels can hold 2n squared electrons where n is the level

Question 40

Law of multiple proportions

Answer 40

a.k.a. daltons law
whenever two elements from more than one compound the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers

Question 41

Average atomic mass

Answer 41

weighted average mass of an element isotope, measured in AMU’s. is the decimal under the letter on the periodic table

Question 42

How to find protons

Answer 42

atomic number

Question 43

how to find electrons

Answer 43

atomic number if neutral

Question 44

How to find neutrons

Answer 44

mass number-atomic number

Question 45

weighted averages

Answer 45

(abundance 1)x(mass1)+(abundance 2)+(mass 2) etc…

Question 46

Mole

Answer 46

1 mol of a thing= 6.02x10e23 of those things

Question 47

Avogrados number

Answer 47

6.02x10e23

Question 48

Molar Mass

Answer 48

1 mole=molar mass in g

Question 49

Gases at STP number

Answer 49

22.4 L