Sience 7 Heat And Temperature

Question 1

Thermal energy

Answer 1

(Heat) is the total energy of all the particles in a material or an object

Question 2

Thermometers

Answer 2

Mechanical or electrical devices measuring temperature (invented by Galileo)

Question 3

Scale

Answer 3

A series of equal measured sections that are marked as numbers used for measurement. (numbers and measurements)

Question 4

Celsius scale

Answer 4

Temperature system most commonly used in cannada and many other parts of the world
(Unite of temperature is called a degree)

Question 5

Freezing point

Answer 5

0 degrees at sea level on the Celsius scale.(water freezes at)

Question 6

Boiling point

Answer 6

100 degrees at sea level on the Celsius scale.(water boils at)

Question 7

Kelvin scale

Answer 7

A scale used for measuring temperatures in scientific experiments. (water freezes on the Kelvin scale at 273k and boils at 373k)

Question 8

Energy

Answer 8

Is a measure of something’s ability to do work

Question 9

Law of conservation of energy (important)

Answer 9

Energy cannot be created or destroyed, only transformed from one object to another

Question 10

Measuring temperature

Answer 10

1.thermometer
2.scale
3celsius scale
4.freezing point
5.boiling point
6.kelvin scale

Question 11

the particle model

Answer 11

-all substances are made of tiny particles too small to be seen
-particles are always in motion
-particles have spaces in between them
The motion of particles increases as temperature increases and decreases as temperature decreases. *temperature indicates the average speed of particles motion in a substance

Question 12

Particle theory of matter

Answer 12

1. All matter is made up of tiny particles
   2.particles are allways moving
   3.ther are spaces between particles
   4.particles of a substance have attractive forces between them
   5.temperature effects the speed of particles
   A. Adding heat- increases speed of particles
   B. Removing heat (cooling) - decreases speed of particles

Question 13

Conduction

Answer 13

Flow of energy between a substances that are in contact.

Question 14

Convection

Answer 14

Flow of heat energy that involves moving liquid or gas particles

Question 15

Radiation

Answer 15

Flow of energy in the form of invisible.
(waves The heat from he sun)

Question 16

Contract

Answer 16

Decrease in volume

Question 17

Expand

Answer 17

Increase in volume(temp changes causes things to expand)

Question 18

Heated

Answer 18

Usually causes expansion

Question 19

Cooled

Answer 19

Usually causes contraction

Question 20

Heat capacity

Answer 20

Amount of thermal energy ( warms or cools the object bye one degrees Celsius

Question 21

Specific heat capacity

Answer 21

Amount of thermal energy that warms or cools the object by one gram of a material by one degree Celsius

Question 22

Melt

Answer 22

Turn from a solid to a liquid

Question 23

Freeze

Answer 23

From a liquid to a solid

Question 24

Evaporate

Answer 24

Turn from a liquid to a gas

Question 25

Condense

Answer 25

Turn from a gas to a liquid

Question 26

Sublimation

Answer 26

Turn from a solid to a gas or a gas to a solid

Question 27

Conduction

Answer 27

Is heat transfer through a matter by physical contact

Question 28

Convection

Answer 28

Is the heat transfer by the movement of a fluid

Question 29

Radiation

Answer 29

Occurs when microwaves infrared radiation(visible light or another form of electromagnetic radiation

Question 30

Energy source

Answer 30

An object or material that can transfer its energy to another objects

Question 31

Radiation

Answer 31

The transfer of energy without any movement of matter

Question 32

Radiant energy

Answer 32

Also known as electromagnetic radiation

Question 33

All forms of radiant energy

Answer 33

-They behave like waves
- they can be absorbed and reflected by objects
- the travel across empty space at the same very high speed 300000 km/s

Question 34

Thermal conduction

Answer 34

The process of transferring thermal energy though direct collisions between particles

Question 35

Heat insulators

Answer 35

Are very poor conductors

Question 36

Fluid

Answer 36

Materials that can be poured or the floe from place to place

Question 37

Convection

Answer 37

A warm fluid that moves around place to place carrying thermal energy with it

Question 38

Convection current

Answer 38

A moving fluid