5.12 + 5.15

This e-lesson consists of 3 objectives; 5.12, 5.15 and 5.11.  I’ll e-mail the other objective separately.

Instructions for Objective 5.12 and 5.15

1.    

5.12+5.15 Starter.  Watch the video and think about the question.  No need to type anything.

2.    5.12+5.15 Questions.  Open the animation.  Forward this e-mail to your blog and complete the questions.

3.    5.12+5.15 Plenary.  Open the attached ppt.  View as slide show.  Think about what the blanks in the table are.  Check your answers with slide 2.  No need to type anything.

4.    Answers to step 2 will be sent separately.  Don’t look at them until you’ve done the work!

Best wishes,

Mr B

5.12+5.15 Starter

	<<Video - simulation of gas pressure in Phun.flv>>

Questions

·         Why does the needle on the meter move when gas particles are introduced into the box?

·         What does the meter measure?

Answers

·         The gas particles collide with all of the walls of the container.  The wall on the right moves outwards and moves the needle.

·         Pressure.  The gas particles colliding with the walls makes a force on the walls.  The walls have a surface area so the quantity measured is pressure, p=F/A.

5.12+5.15 Questions

·         

5.12 recall that molecules in a gas have a random motion and that they exert a force and hence a pressure on the walls of the container

·         5.15 understand that an increase in temperature results in an increase in the speed of gas molecules

Try the animation 

http://www.lon-capa.org/~mmp/kap10/cd283.htm

1.    How do the particles create a pressure?

Because gas molecules are moving around at random motion, they eventually collide into the wall of the container, exerting force on its surface.

2.    

If you increase the temperature, how does the movement of the particles change?

The speed of the movement of gas molecules increases due to the increase in average kinetic energy.

3.    

If you increase the temperature, how does the number of collisions per second change?

The collisions per second increases.

4.    

If you increase the temperature, what does this do to the pressure?

The pressure increases due to the increase in kinetic energy, which increase the collision of gas molecules to the wall. As a result, more force is being exerted onto the wall of the container and therefore pressure increases. 

5.12+5.15 Plenary

<<Ideal gases - summary of terms.pptx>>

Ideal gases - summary of terms.pptx Download this file