6.6 Gas pressure and temperature

Question 1

Explain what happens when the pressure of gas increases

Answer 1

• temperature increases
• molecules collide with each other and surface
• Exerts force on surface

Question 2

Why does increasing temperature of any sealed gas container increase the pressure of the gas inside it

Answer 2

• Energy transferred to gas when its heated increases the kinetic energy of its molecules
• Average speed of molecules increases as they hit the container with more force and more often

Question 3

By using a smoke cell and a microscope explain how you can see evidence of molecules moving around

Answer 3

• Air molecules repeatedly collide
• They move fast but too small to see
• Smoke particles are larger
• See random motion of smoke particles caused by impacts that gas molecules make on each smoke particle
• Unpredictable motion of some particles is evidence of the random motion of gas molecules

Question 4

What is absolute zero

Answer 4

Temperature where all particles stop moving

Question 5

How can you get from kelvin to celsius

Answer 5

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