Chem: Key Vocabulary Unit 1

Question 1

Matter

Answer 1

the materials of the universe, takes up space and volume

Question 2

Solid

Answer 2

tightly packed, holds shape, not compressible

Question 3

Liquid

Answer 3

packed together, shape of container, not compressible

Question 4

Gas

Answer 4

far apart, shape of container, easily compressible

Question 5

Atom

Answer 5

the fundamental unit of which all matter is composed

Question 6

Element

Answer 6

Substances that contain only ONE type of atom

Question 7

Compound

Answer 7

substances made by bonding atoms together in specific ways/more than one element

Question 8

Molecule

Answer 8

type of compound where atoms are “stuck” together

Question 9

Particle

Answer 9

a small portion of matter

Question 10

Mixture

Answer 10

something that has 2 or more pure substances / physically combined

Question 11

homogeneous mixture

Answer 11

same throughout, mixed evenly

ex. soda (cannot see different parts)

Question 12

heterogeneous mixture

Answer 12

contains regions with various properties, mixed unevenly

ex. chex mix (can see different parts)

Question 13

pure substance

Answer 13

contains only 1 substance

Question 14

quantitative observation

Answer 14

measurement (number + unit)

Question 15

qualitative observation

Answer 15

use 5 senses

Question 16

chemical properties

Answer 16

• color change
• bubbles
• change in temperature
• forms new substance (precipitate)

Question 17

physical properties

Answer 17

change in substance without changing properties,