Chemistry Test Prep

Question 1

Plum Pudding

Answer 1

D: An atom is a positive sphere embedded with negative electrons
Scientist: JJ Thomson

Question 2

Billiard Ball

Answer 2

An atom is solid sphere similar to a billiard ball
Scientist: John Dalton

Question 3

An atom consists of a tiny positively charged nucleus, surrounded mostly by empty space containing negative electrons

Answer 3

Scientist: Ernest Rutherford

Question 4

Gold foil experiment

Answer 4

Ernest Rutherford

Question 5

Electric current in gas discharge tubes

Answer 5

JJ Thomson

Question 6

Make hydrogen gas glow by passing an electric current through it

Answer 6

Niels Bohr

Question 7

Planetary Model

Answer 7

Niels Bohr

Question 8

Ice disappears in a drink

Answer 8

Melting, Absorbed (endothermic)

Question 9

Frost forms on your lawn

Answer 9

Deposition, Released (Exothermic)

Question 10

Snow melts without a trace

Answer 10

Sublimation, Absorbed (ENDO)

Question 11

Raining

Answer 11

Condensation, released (Exothermic)

Question 12

Snowing

Answer 12

Deposition, released (exothermic)

Question 13

Car windows fog up

Answer 13

Condensation, released (Exothermic)

Question 14

What happens to the temp during a change of state?

Answer 14

It remains constant

Question 15

Describe what happens to the particles as heat is added?

Answer 15

Particles move faster and farther apart

Question 16

What are the 4 points of kinetic molecular theory (kmt)?

Answer 16

-All matter is made up of very small particles
-There is empty space between the particles
-The particles are constantly moving
-Energy makes the particles move

Question 17

Fill in the blanks:
Solid:
Shape:
Volume:
Space between particles:
Movement of particles:

Answer 17

Volume: Fixed
Shape: Fixed
Space between particles: Tightly packed together
Movement of particles: Vibrate

Question 18

Fill in the blanks:
Liquid:
Shape:
Volume:
Space between particles:
Movement of particles:

Answer 18

Shape: Not fixed
Volume: Fixed
Space between particles: Farther apart and a little bit more room than solid
Movement of particles: Slip and slide past each other

Question 19

Fill in the blanks:
Gas:
Shape:
Volume:
Space between particles:
Movement of particles:

Answer 19

Shape: Not fixed
Volume: Not fixed
Space between particles: Very far apart, there are large spaces between particles
Movement of particles: Move quickly and freely

Question 20

Salt dissolves in water

Answer 20

Chemical

Question 21

Cooking a hotdog

Answer 21

Chemical, Absorbed (Endo)

Question 22

Precipitate forms

Answer 22

Chemical

Question 22

Dew evaporates off of grass

Answer 22

Physical, Absorbed (ENDO)

Question 22

Candle burning (anytime anything burns its chemical change)

Answer 22

Chemical, Released (EXO)

Question 22

Condensation forms on a mirror

Answer 22

Chemical, Released (EXO)

Question 23

Pure substance

Answer 23

Made up of only one type of matter

Question 23

Element

Answer 23

Pure substance which cannot be broken down any further and is made up of only one type of atom

Question 23

Compound

Answer 23

Pure substance which is made up of two or more different types of elements

Question 23

Precipitate

Answer 23

Solid forms in a liquid

Question 24

Exothermic

Answer 24

A chemical or physical change which releases energy/heat

Question 25

Endothermic

Answer 25

A chemical or physical change which absorbs energy/heat

Question 26

What subatomic particle has a positive charge

Answer 26

Protons

Question 27

What subatomic particle determines the size of the atom

Answer 27

electrons

Question 28

Two particles that are almost equal in mass

Answer 28

Protons and Neutrons

Question 29

Has a negative charge

Answer 29

Electrons

Question 30

Found in the nucleus

Answer 30

Protons and Neutrons

Question 31

Contributes to the mass of the atom

Answer 31

Protons and Neutrons

Question 32

Has negligible mass

Answer 32

Electrons

Question 33

ALWAYS equal to the atomic number

Answer 33

Protons

Question 34

Two particles that exist in equal numbers in a neutral atom

Answer 34

Protons & Electrons