Physical Science

Question 1

Solid

Answer 1

Fixed shape and volume; tightly packed particles that vibrate in place

Question 2

Liquid

Answer 2

Definite volume but takes the shape of container; particles are loosely packed and flow past each other.

Question 3

Gas

Answer 3

No fixed shape or volume; particles move freely and are far apart

Question 4

Plasma (extra state)

Answer 4

high-energy state where electrons are stripped found in stars and lightning

Question 5

physical change

Answer 5

changes appearance, not chemical identity (melting, boiling, freezing, dissolving)

Question 6

chemical change

Answer 6

produces new substances (rusting, burning, baking a cake)

Question 7

Temperature

Answer 7

measure of average kinetic energy of particles

Question 8

heat

Answer 8

transfer of energy due to temperature difference

Question 9

conduction

Answer 9

direct contact (pan or stove)

Question 10

convection

Answer 10

movement in fluids (boiling water)

Question 11

radiation

Answer 11

electromagnetic waves (sunlight)

Question 12

Celsius

Answer 12

water freezes at 0 C, boils at 100 C

Question 13

Fahrenheit

Answer 13

Water freezes at 32 F, boils at 212 F

Question 14

Kelvin

Answer 14

Absolute zero is 0 K

Question 15

molecule

Answer 15

two or more atoms bonded

Question 16

homogeneous

Answer 16

uniform (salt water)

Question 17

heterogeneous

Answer 17

not uniform (salad)

Question 18

energy

Answer 18

ability to do work or cause change

Question 19

kinetic

Answer 19

energy of motion

Question 20

potential

Answer 20

stored energy

Question 21

thermal

Answer 21

heat energy

Question 22

chemical

Answer 22

in chemical bonds

Question 23

mechanical

Answer 23

moving parts

Question 24

electrical

Answer 24

flow of electrons

Question 25

nuclear

Answer 25

from atomic nucleus

Question 26

work

Answer 26

force x distance

Question 27

unit

Answer 27

Joule (J)