Luke Physics: October 2011

Friday, October 28, 2011

5.9 and 5.10 starter

Instructions for Objective 5.9 and 5.10
1.
5.9 and 5.10 Starter. Think through your answers and then verify with the attached animation
2.    5.9 and 5.10. Forward this e-mail to your blog and complete the table
3.    Answers to step 2 will be sent separately. Don’t look at them until you’ve done the work!
Best wishes,
Mr B
5.9 and 5.10 starter
28 October 2011
12:01
Tell the person next to you…
·         How do particles in move in a solid, a liquid and a gas?
·         Describe…
o    speed of particles
o    relative position of particles (fixed or not)
o    pattern of particles (regularly arranged or not)
o    size of the particles
o    space between the particles
o    strength of bonds between the particles

Solid - Paricles vibrate on the spot, least kinetic energy. They have a fixed shape and similar sized particles. They are closely compacted. Strength of the bond is strong.

liquids - Move and flow over each other. Don't have a fixed shape and takes the shape of the container. Strength between the bond is weaker than with a solid.

Gases - particles have the most kinetic energy. They don't have a fixed shape when grouped and have no pattern.

5.9 and 5.10
28 October 2011
10:21
·
5.9 recall that particles in a liquid have a random motion within a close-packed irregular structure
·         5.10 recall that particles in a solid vibrate about fixed positions within a close-packed regular structure
·         Complete the missing words in the table below
·         Cut and paste the particle images into the table

State
Particle
Picture
Arrangement of Particles
Motion of Particles
Other Properties
Solids

·
closely packed
·         regular pattern
·         vibrate about a fixed position
·         fixed shape
·         not easily compressed since particles are closely packed
·         Strong bonds
Liquids

·
closely packed
·         no pattern
·         free to flow over each other
·         takes shape of its container
·         can be poured
·         not easily compressed since particles are closely packed
·         Weak bonds
Gases

·
widely spaced
·         no pattern
·         very fast moving
·         random directions
·         fills its container
·         can be poured
·         easily compressedd since its particles are far apart

5.7 and 5.8

Instructions for Objective 5.7 and 5.8
1.
5.7 and 5.8 Starter. Find out the names of the processes. Research on the internet if necessary. No need to blog this.
2.    5.7 and 5.8. Forward this e-mail to your blog and type the answers into the e-mail.
3.    5.7 and 5.8 Experiment. I’m afraid you can’t do the expt until we get back but watch the video clip to see how it’s set up and have a look at the graph of the results.
4.    5.7 to 5.10 Plenary 1. Play the attached “States of Matter”
5.    5.7 to 5.10 Plenary 2. Play the attached “Fill the trucks”
6.    PhET States of matter simulation - embedding into your Posterous blog. Embed in your blog and then have a play
5.7 and 5.8 Starter
28 October 2011
11:00
·         What are the 6 processes shown by the arrows?

5.7 and 5.8
28 October 2011
10:20
·
5.7 understand that a substance can change state from solid to liquid by the process of melting
·         5.8 understand that a substance can change state from liquid to gas by the process of evaporation or boiling
·         Questions from Collins p.112
·         Answer in Bullet Points!

1a. Liquids and gasses loose their shape because the structures of the atoms are not in a fixed pattern and therefore, the bonds are more free and the particles are able to move freely.

b. This is because solids and liquids do have bonds between them and have an almost fixed pattern. Gasses fill their container because they have no bonds and therefore their shape can be changed to fit the container.

Evaporation happens when the air gets hotter and gives the particles on the surface of the water gain kinetic energy and break apart from the bonds and turn into a gas.

Boiling happens when when the temperature of the liquid reaches the boiling point. Its a fast process that breaks the bonds of the particles and turns them into a gas.

Use following pages from Collins as a resource to help you

5.7 and 5.8 Experiment - Cooling Curve of Stearic Acid using datalogger
15 October 2010
14:34

5.7 to 5.10 Plenary 1
28 October 2011
12:19
·
Play the Stage 1 game to test your knowledge of solids, liquids and gases
·         Play the Stage 2 game to test your knowledge about changes of phase!

5.7 to 5.10 Plenary 2
28 October 2011
12:19

Play the Level 1 game to test your knowledge of the properties of solids, liquids and gases

Extension: Play the Level 2 game to extend your knowledge about changes of phase!
PhET States of matter simulation - embedding into your Posterous blog
28 October 2011
11:14
·

states of matter drag and drop plenary.swf Download this file

Fill the trucks - Properties of s,l,g.swf Download this file

Answers - Corrections to questions

Cheers,
Mr B
5.9 and 5.10 answers
28 October 2011
10:21

5.7 and 5.8 Starter answers
28 October 2011
11:00
·
What are the 6 processes shown by the arrows?

Melting

Boiling

5.7 and 5.8 Answers
28 October 2011
10:20
·         Collins p.112

1a
·         Particles in a solid are strongly bonded to each other so their particles are held in a fixed, regular pattern and can not move
·         The bonds between particles in liquids and gases are weaker and therefore their particles can move relative to each other

1b
·         The particles in solids and liquids are closely packed and they are therefore incompressible
·         The particles in a gas are very widely spaced and the forces between them are very weak so they can spread out to fill their container

Boiling
·         Boiling occurs when you heat a liquid until the average energy of the particles is great enough for them to turn into a gas
·         Boiling occurs at a fixed temperature called the boiling point
·         Boiling occurs throughout a liquid
·         It is a fast process
·

Evaporation
·         Evaporation occurs when a liquid is left open to the air
·         Only particles at the surface of the liquid that have enough energy can escape the liquid into the air
·         Evaporation occurs for a range of temperatures; high temperatures increase evaporation, low temperatures decrease evaporation
·         Evaporation only occurs from the surface of a liquid
·         It is a slower process
·         Because it removes the most energetic particles from a liquid the average energy of the remaining particles is decreased and the liquid cools down
·

Monday, October 24, 2011

ps

ps. 1,000mbar = 1 bar = 100,000Pa!

5.6 Questions

5.6 Questions
07 October 2011
11:53
Collins, p.107
Note:
ρ_{fresh water} = 1,000kg/m³; g = 10N/kg

5.6 Demo - squirting water column

·
The bottom hole squirts water the furthest
·         Because the water at the bottom has the greatest pressure
·         Because in the formula ∆p = h × ρ × g, ρ is constant, g is constant and h is large
·         So ∆p = large

5.5 Demo 1 - Magdeburg Hemispheres

5.5 Demo 1 - Magdeburg Hemispheres
12 October 2011
07:19
·
Magdeburg Hemispheres

· And here are the horses I was talking about!

5.6

·
5.6 recall and use the relationship for pressure difference:

        pressure difference = height × density × g
                               ∆p = h × ρ × g

∆p = pressure of the fluid (N/m² or Pa)
h = height of the fluid (m)
ρ = density of the fluid (kg/m²)
g = gravitational field strength (N/kg)