P3–2A–006—17-02-2020

• Natuurkunde / Scheikunde
• Middelbare school
• vwo
• Leerjaar 2

This lesson

• Gas and pressure
• pV= constant
• Intro thermometer practical 
• Closing of Chapter 5

Goals

• Explain why a gas exerts pressure
• Name two factors that influence the pressure a gas exerts
• Explain the formula pV = constant
• Apply pV = constant in calculations

Gas and pressure

Gas and pressure

kinetic theory of gases

• molecules are very small relative to the space in between them
• the molecules are in constant ramdom motion
• Colide freqeuently with eachother and the walls of the container

Link

Gas and pressure

• Does gas exert pressure? yes / no
• Explain why
• Two factors that influcence it + an explination for each factor
  

pV = constant

• p: pressure in Pa (1 Pa = 1 N/m2)
• V: volume in m3

An avarage baloon holds 11400 cm3 of air under a pressure of 101 kPa

a) What would be the volume of this amount of gas under a pressure of 150 kPa?

b) What would be the volume of this amount of gas under a pressure of 50 kPa

A gasbottle holds 25000 cm³ of gas under a volume of 200000 pa

a) What would be the pressure in the gas bottle if the gas had a volume of 20000 cm³ ?

b) What whould be the volume of the gas if there would be a pressure of 180000 pa on it?

Intro themometer practical

• What is a liquid-in-glas thermometer?
• How does such a themomter work?
• What is the celcius scale calibrated to?
• How can you make a liquid-in-glas celcius scale themometer yourself?

Closing chapter 5

Make a summary of chapter 5 

integrated in the mindmap of properties of mater

include a summary about a themomter

Homework

Make a summary of chapter 5 

integrated in the mindmap of properties of mater

include a summary about a themomter

What did we cover this lesson?

Goals

• Explain why a gas exerts pressure
• Give two factors that influence the pressure a gas exerts
• Explain the formula pV = constant
• Apply pV = constant in calcualtions

Homework

Make a summary of chapter 5 

integrated in the mindmap of properties of mater

include a summary about a themomter

Next lesson

• Preparing for the practical
• more about properties of mater