Chapter 3

Question 1

Formula of density=

Answer 1

mass/volume

Question 2

Formula of volume=

Answer 2

mass/density

Question 3

Formula of mass=

Answer 3

volume x density

Question 4

density of object<density of liquid=

Answer 4

float

Question 5

density of object>density of liquid=

Answer 5

sink

Question 6

1g/cm3=

Answer 6

1000kg/m3

Question 7

What is heat?

Answer 7

total measure of energy in particles

Question 8

What is temperature?

Answer 8

how hot something is, average energy of particles

Question 9

Unit of heat and temperature

Answer 9

joules(J), celcius( °C) or kelvin(K)

Question 10

Temperature of absolute zero

Answer 10

-273 °C

Question 11

What is the law of conservation of energy

Answer 11

Energy cannot be created or destroyed, but it can be transferred from one form to another.

Question 12

What is conduction?

Answer 12

transfer of heat from one particle to another

Question 13

What is convection?

Answer 13

transfer of heat through motion of gas or liquid

Question 14

What is radiation?

Answer 14

flow of heat between objects that are not in contact with each other

Question 15

Black objects are good or poor absorbers of heat?

Answer 15

good absorbers of heat

Question 16

White objects are good or poor absorbers of heat?

Answer 16

poor absorbers of heat

Question 17

How does evaporation cause cooling in water?

Answer 17

When the particles with the highest energy escapes, thermal energy from the water is transferred to the particles, decreasing the average energy in the water.