Conceptual Physics-Heat and Density

Question 1

Conduction

Answer 1

Heat transfer by direct contact of molecules

Question 2

Convection

Answer 2

Heat transfer by movement of groups of particles (hotter molecules rise, colder molecules sink)
only in gases and liquid
caused by differences in density

Question 3

Mass

Answer 3

amount of matter in an object

Question 4

Volume

Answer 4

how much space something takes up/occupies

Question 5

Density

Answer 5

Mass/Volume
matter per unit of space
grams/cubic centimeter or milliliter
g/cm3 or g/mL

Question 6

Radiation (not nuclear…)

Answer 6

heat transfer by electromagnetic (EM) waves

can occur anywhere, even vacuums like space

Question 7

blank things absorb heat

Answer 7

black or dull

Question 8

blank things reflect heat

Answer 8

white or shiny

Question 9

Thermodynamics

Answer 9

study of heat energy

Question 10

Thermal equilibrium

Answer 10

when two or more solids, liquids, and/or gases of differing temperatures are placed near each other, they gradually will become the same temperature.

Question 11

R Value

Answer 11

Stands for resistance to heat flow
higher= better insulation
To find total of combined R values, add

Question 12

In boiling water, heat is transferred by groups of molecules that rise as they become less dense. This is an example of blank

Answer 12

convection

Question 13

You touch a hot panhandle and you are burned. This is an example of blank

Answer 13

conduction

Question 14

A radiator near the floor heats up the air around it. This air rises towards the ceiling, where it gradually cools and sinks to the floor, where it is heated again. This is an example of blank

Answer 14

convection

Question 15

The sun heats the earth. This is an example of blank.

Answer 15

radiation

Question 16

You pick up an icecube and hold it in your palm. It begins to melt (not because of heat from a source other than your hand). This is an example of blank.

Answer 16

conduction

Question 17

A fire heats up a room. This is an example of blank.

Answer 17

Radiation

Question 18

What heat transfer can occur in a vacuum?

Answer 18

radiation

Question 19

Insulation prevents heat loss by:

Answer 19

?

Question 20

Heat is transferred into a house

Answer 20

?

Question 21

Heat always moves from blank1 to blank2.

Answer 21

hot to cold

Question 22

Does heat rise?

Answer 22

No. Hot gases or liquids rise because they are less dense. Heat moves in whatever direction the colder substance is.

Question 23

Insulators

Answer 23

slow down heat transfer

air pockets are good insulators

Question 24

Conductors

Answer 24

easily allow heat transfer

most metals are good conductors

Question 25

solids have blank1 density and are better blank2

Answer 25

high

conductors

Question 26

gases have blank1 density and are better blank2

Answer 26

low

insulators

Question 27

Wind is created

Answer 27

when the sun warms air near the surface of ear, which rises. cooler air is pulled in beneath it to take its place, creating wind

Question 28

radiation transfers heat in which directions?

Answer 28

all

Question 29

Radiation blank transparent materials

Answer 29

goes through

Question 30

When hot air rises; causes wind; within a pan of boiling water- these are examples of blank

Answer 30

convection

Question 31

when two objects are touching; when atoms collide; between a stove and a pot; though a car’s windows at night- these are examples of blank

Answer 31

conduction

Question 32

when nothing is touching; transfers heat in all directions; more occurs with dark objects- these are examples of blank

Answer 32

radiation

Question 33

name good insulators

Answer 33

wood; air; coat; styrofoam

Question 34

name good conductors

Answer 34

metal; glass; copper; water; aluminum

Question 35

Name things that absorb heat or heat fast

Answer 35

dark liquids; dull objects; black paper; dark car

Question 36

Name things that reflect heat or heat slowly

Answer 36

clear liquids; shiny objects; white paper; aluminum; styrofoam

Question 37

Bonus! Name the three systems to measure heat and mention which need a degree symbol.

Answer 37

DEGREES Celsius
DEGREES Fahrenheit
Kelvins (no degrees!!!)