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Chemical Changes and Heat Transfer > Heat Transfer > Flashcards

Heat Transfer Flashcards

1
Q

Define conduction

A

The way heat travels through solids

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2
Q

What is a conductor?

A

A material which lets energy flow through it easily

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3
Q

What is a convection current?

A

A current created by heat causing changes in the density of a fluid

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4
Q

What is a heat insulator?

A

Material that does not let heat energy flow easily through it

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5
Q

What is Infrared Radiation?

A

A wave that can travel through transparent things and a vacuum (empty space)

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6
Q

What is an insulator?

A

A material that does not let energy flow through it easily

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7
Q

What are Joules?

A

The units for measuring energy

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8
Q

What is radiation?

A

The transfer of heat energy by electromagnet waves

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9
Q

Which colour reflects heat the best?

A

Shiny surfaces and white (silver)

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10
Q

Which colour absorbs heat the best?

A

black (particularly matte black)

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11
Q

What colour releases heat the best?

A

black

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12
Q

How do windows insulate?

A

Double glazing traps air between the two glass panes, and since air does not conduct heat well it keeps the heat in the house

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13
Q

How are walls in modern houses insulated?

A

Foam, which contains air bubbles which cuts conduction and prevents convection currents

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14
Q

How can radiators be insulated to prevent escaping heat

A

Shiny, silver sheets which reflect the heat are placed between the radiator and the wall since silver reflects heat

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15
Q

Why will a hot cup of tea gradually cool over time?

A

Because the tea gives out heat energy to its surroundings

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16
Q

Why will a cool drink straight out of the fridge warm up over time?

A

Because the cold drink will take in energy from its surroundings

17
Q

Define temperature. How is it measured?

A

A measure of how hot or cold something is. It’s determined by the average kinetic energy in the particles of the object

18
Q

How well do solids conduct heat?

A

Solids (especially metals such as copper and aluminium) conduct heat well

19
Q

Why do metals conduct heat well?

A

The outer electrons in metal atoms drift and are free to move. When the metal is heated, this ‘Sea of Electrons’ gain kinetic energy and transfer it quickly throughout the metal.

20
Q

How well do liquids conduct heat?

A

Not very well, they are poor conductors

21
Q

How well do gasses conduct heat?

A

Not very well, they are poor conductors

22
Q

Describe how a convection current is formed (3 steps)

A
  1. The Bunsen burner heats the liquid/gas
  2. The hot water/gas expands, becomes less dense and begins to rise
  3. Cooler, denser liquid/gas sinks to replace the rising substance, and so a convection current is formed

Chemical Changes and Heat Transfer (2 decks)

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