FQ - 2B - 10 de marzo de 2022

Chapter 6
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Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavoLeerjaar 2

In deze les zitten 10 slides, met tekstslides en 1 video.

Onderdelen in deze les

Chapter 6

Slide 1 - Tekstslide

Deze slide heeft geen instructies

You will learn to...
  • Relate the concept of temperature to the average kinetic energy of particles in movement.
  • Distinguish between the concepts of heat and temperature.
  • Recognise the concept of heat as the transfer of thermal energy between two bodies at different temperatures.
  • Learn about the physical processess that allow us to measure temperature with different thermometers.
  • Relate the Kelvin scale to the Celsius scale.
  • Recognise thermal equilibrium as the consequence of the transfer of thermal energy between two bodies or systems at different temperatures.
  • Explain the three mechanisms of heat transfer.
  • Justify the choice of materials to improve heat efficiency in buildings.

Slide 2 - Tekstslide

Deze slide heeft geen instructies

Today you will learn
  • Relate the concept of temperature to the average kinetic energy of particles in movement.
  • Distinguish between the concepts of heat and temperature.
  • Relate the Kelvin scale to the Celsius scale. 

Slide 3 - Tekstslide

Deze slide heeft geen instructies

Thermal energy
Temperature is related to the movement of particles (atoms and molecules) that make up matter.

All bodies, moving at a certain speed,
have kinetic energy and therefore, so do
the molecules or atoms that form them.

Thermal energy is the average kinetic
energy of the atoms or molecules in a
substance.

Slide 4 - Tekstslide

We can see that the molecules in a solid substance are bonded, joined together. So, besides the kinetic energy which makes them vibrate, there is also energy stored in these bonds.

When we heat up a substance, we are tranferring energy and, therefore, increasing the thermal energy of its molecules. The molecules vibrate faster.
A moment comes in the 
heating process when the
energy that we supply is no 
longer used to increase the
thermal energy. It's used to
break the bonds that join the
molecules together. 
Molecules start moving faster.

Slide 5 - Tekstslide

Deze slide heeft geen instructies

Video
Watch the video and make notes on what's important!

Slide 6 - Tekstslide

Deze slide heeft geen instructies

Slide 7 - Video

Deze slide heeft geen instructies

Important in the video
Temperature – measure of how hot or cold something is compared to a reference point. Measuring temperature in three scales: Fahrenheit, Celsius and Kelvin.
Absolute zero (O K) = lowest temperature possible. Particles have no kinetic energy.
Thermal energy – total energy of all the particles in an object & depends on the temperature of the object and the number of particles in that object
Heat – transfer of thermal energy from a warmer object to a cooler object

Slide 8 - Tekstslide

Deze slide heeft geen instructies

The centigrade scale or Celsius

Used to measure normal temperatures

0 - water freezes
100 - water boils

36,5 - human body

t(°C) = (kelvin) - 273
The absolute scale or Kelvin
The real or physical temperature scale of a body.

Is directly related to the movement of the particles.

absolute zero / zero Kelvin - the natural limit of temperatures

(Kelvin) = t(°C) + 273

Slide 9 - Tekstslide

Deze slide heeft geen instructies

Let's practise
Make exercises 2, 3, 4 on page 123

Make a mindmap of the theory.

Slide 10 - Tekstslide

Deze slide heeft geen instructies