exam 1 ch.1-2

Question 1

chemical change

Answer 1

ONLY displayed by changing the composition of a substance.

Burning, rusting, flammability, toxicity, bubbles forming, looks/smells different, or no change at all.

Question 2

physical change

Answer 2

Does not change substance composition.

Density, Freezing/Melting point. No changes of temperature

Question 3

solid

Answer 3

Definite Shape (Does not flow)
Definite Volume (Non-compressible)

Question 4

liquid

Answer 4

Indefinite Shape (Flows)
Definite Volume (Non-compressible)

Question 5

gas

Answer 5

Indefinite Shape
Definite Volume (Compressible)

Question 6

plasma

Question 7

atomic mass

Question 8

atomic weight

Question 9

atomic number

Question 10

accuracy

Question 11

percision

Question 12

element

Answer 12

pure substance cant break down

Question 13

compound

Answer 13

Composed of different atoms that are chemically bonded.

Question 14

heterogenous mixture

Answer 14

the composition varies from one region to another.

example: oil, water,

Question 15

homogenous mixture

Answer 15

the composition is the same throughout.

example: salt water, sweet tea

Question 16

proton

Question 17

neutron

Question 18

electron

Question 19

conversions

Answer 19

deci -
nano -
kilo-

Question 20

exact number