Chemistry Chapter 4 - Atomic History

Question 1

Match the model to the scientist

Accepted Answer

A - Dalton, B - Rutherford, C - Thomson

Question 2

What is the mass number of phosphorus?

Accepted Answer

31

Question 3

What particle was used in the gold foil experiment?

Accepted Answer

alpha

Question 4

Element X has isotopes X-138 (59.2%) and X-141 (40.8%), what is the average mass of X?

Accepted Answer

139.2

Question 5

What particle requires lead or concrete to stop it?

Accepted Answer

gamma

Question 6

What did Dalton's atomic theory not state?

Accepted Answer

Atoms of the same element are different

Question 7

Who is credited with the discovery of neutrons?

Accepted Answer

Chadwick

Question 8

What was Roentgen known for?

Accepted Answer

X-Rays

Question 9

Who came up with the plum pudding model?

Accepted Answer

Thomson

Question 10

What particle makes up neutrons?

Accepted Answer

Quarks

Question 11

How many protons are in Ca+2?

Accepted Answer

20

Question 12

What is an alpha particle?

Accepted Answer

Helium nucleus

Question 13

What was Dalton's model called?

Accepted Answer

Billiard Ball Model

Question 14

Who proposed the law of definite proportions?

Accepted Answer

Proust

Question 15

What is the correct symbol for an alpha particle?

Accepted Answer

a

Question 16

What particles can be stopped with a sheet of paper?

Accepted Answer

alpha

Question 17

How many neutrons are in U-238?

Accepted Answer

146

Question 18

How many electrons are in Br-1?

Accepted Answer

36

Question 19

Element Q has a mass of 122.45, if the isotopes are Q-120 and Q-123, what's the % of each?

Accepted Answer

Q-120 18.3% Q-123 81.7%

Question 20

What approximately is the mass of an electron?

Accepted Answer

1/1900th of a hydrogen atom

Question 21

Who first used the term cathode rays?

Accepted Answer

Goldstein

Question 22

What is the charge of an "up" quark?

Accepted Answer

+2/3

Question 23

What are the only particles called that contribute to the mass of an atom?

Accepted Answer

Nucleons

Question 24

What is Lavosier known for?

Accepted Answer

Law of conservation of mass

Question 25

Who conducted the gold foil experiment?

Accepted Answer

Rutherford

Question 26

Who performed the oil drop experiment?

Accepted Answer

Milikan

Question 27

What did the oil drop experiment prove?

Accepted Answer

The charge of the electron is exactly -1

Question 28

What two scientists inspired Dalton's work?

Accepted Answer

Proust and Lavosier

Question 29

What is the screen made of in Rutherford's experiment?

Accepted Answer

zinc sulfide

Question 30

Who discovered radioactivity?

Accepted Answer

Becquerel

Question 31

Cathode rays move in what direction when subjected to a negatively charged magnetic field?

Accepted Answer

Away

Question 32

Who is credited with the discovery of the nucleus of the atom?

Accepted Answer

Rutherford

Question 33

Which is the correct decay series?

Accepted Answer

C

Question 34

Who discovered isotopes?

Accepted Answer

Thomson

Chemistry Chapter 4 - Atomic History

Questions 34

Chemistry Chapter 4 - Atomic History

Questions 34