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Physics > Heat > Flashcards

Heat Flashcards

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0
Q

What happens when we heat a solid, liquid or gas?

A

It expands

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1
Q

What is heat?

A

It is a form of energy

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2
Q

What happens when we cool a solid, liquid or gas?

A

It contracts

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3
Q

What are the three methods of heat transfer?

A

Convection
Conduction
Radiation

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4
Q

What is conduction?

A

Heat travels from particle to particle along a substance, normally a solid

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5
Q

What is convection?

A

Heat travels through a fluid (liquid or a gas) when the particles move and carry the heat

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6
Q

What is radiation?

A

Heat travels from a hot object without the need for a medium, does not need a solid, liquid or gas to go through, will flow through a vacuum

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7
Q

What is a conductor?

A

Something that allows energy e.g heat to flow through it E.g metal is a good conductor

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8
Q

What is an insulator?

A

An insulator is a substance that doesn’t allow heat to flow through easily e.g plastic

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9
Q

How do you show that a solid expands when heated and contracts when cooled

A

Ball and ring apparatus

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10
Q

What is the function of air ?

A

It is a good insulator, keeps animals warm, is trapped by the fur and helps to insulate animals

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11
Q

How does layers keep us warm?

A

The hairs on our arms are not very good at keeping us warm if we wear layers of clothes, air is trapped to keep us warm

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12
Q

What is a medium?

A

A solid, gas or liquid

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13
Q

How do you show the expansion of liquids when heated and contraction when cooled?

A

Boiled water in a round bottom flask, a glass on top of it, a bunsen burner under the flask and the retort stand to hold the flask

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14
Q

What is the result of the investigation that water expands when heated and contraction when cooled

A

The expanded water rises up the glass tube but when the bunsen burner is off the water sinks

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15
Q

How do you show the expansion of gases when heated and contraction when cooled

A

A rounded bottom flask held upside down by the retort stand, a water filled beaker below the flask and a bunsen burner held at the side of the flask

16
Q

How do you show the transfer of heat energy by conduction in solids.

A

A boiled water filled basin with different metals sticking out of it and wax at the tip of each metal and a drawing pin at the end of metal

17
Q

What is the result of the experiment to show the transfer of heat energy by conduction in solids

A

When the heats travels along the rods and the wax melts dropping the pins this shows that the first rod to drop their pin is the best conductor

18
Q

How do you show the transfer of heat energy by convection in water

A

Put a bunsen burner under a tripod and place a water filled beaker above the tripod put some potassium permanganate

19
Q

What is the result of the transfer of heat by convection in water?

A

The powder acts as dye with the water it slowly rises and then sinks

20
Q

What is the conclusion of the transfer of heat energy by convection in water

A

In the water this shows convection as the dye rises with the water and as it cools at the top it sinks this is convection currents

21
Q

How do you show the transfer of heat by radiation?

A

Put two thermometers in two boiling water filled metal cans and place the two cans on a tripod each

22
Q

What is the result of showing the transfer of heat by radiation

A

The temperature drops

23
Q

What is the conclusion of showing the transfer of heat by radiation?

A

The heat travelled by radiation from the hot water to the cans

24
Q

Why does the bimetallis strip bend?

A

It expands because the copper expands more than the iron

25
Q

What temperature does water has its greatest density

A

4C

26
Q

Why does ice float on water?

A

The volume of the ice will be bigger than the volume of water

27
Q

What is the melting point of ice?

A

0C

28
Q

What is the boiling point of water?

A

100C

29
Q

What happens to the boiling point of water when the pressure increases?

A

It increases the boiling point

30
Q

What is latent heat?

A

Change in state not in temperature

31
Q

In a graph when the line is getting or lower if it stays straight for a while
what does it mean

A

If it stays straight it means change in state

32
Q

What does the experiment show about the transfer of heat energy in water

A

Water is not a good conductor

Physics (10 decks)

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