Unit 3 Test

Question 1

Chemistry

Answer 1

Chemistry is the study of the composition, properties, and structure of matter, the process that matter undergoes, and the energy changes that accompany these processes

Question 2

Atom

Answer 2

Smallest unit of an element that maintains the chemical identity of that element

Question 3

Nucleus

Answer 3

Has at least one proton, and one or more neutrons.

Question 4

Electron Cloud

Answer 4

Area where the electrons hang out - probability area

Question 5

Atomic number

Answer 5

The number of protons in the nucleus or each atom of that element

Question 6

Atomic mass unit

Answer 6

1/12 the mass of a carbon-12 atom

Question 7

Isotope

Answer 7

are atoms of the same element with different masses

Question 8

Mass Number

Answer 8

Total number of protons and neutrons

Question 9

Mole

Answer 9

6.022 * 10(23)

Question 10

Who was Dalton?

Answer 10

he was a schoolteacher who created an atomic theory

Question 11

What was wrong with Dalton’s Atomic Theory

Answer 11

Atoms cannot be subdivided

Question 12

What was correct about Dalton’s theory?

Answer 12

every single atom of an element is the same as every other atom of that element.

Question 13

JJ Thompson?

Answer 13

Cathode Ray Tube (showed that all atoms contain tiny negatively charged subatomic particles or electrons.)

Question 14

Millikan?

Answer 14

Oil Drop Experiment(Able to calculate the charge of a single electron (9.109 * 10(-28)g)

Question 15

Rutherford? (You will have to draw and describe it)

Answer 15

Gold Foil Experiment (Alpha particles were shot at gold Foil, most went straight through with few deflections, however, some deflections came right back at the source.)