Grade 7 Chapter 10 Test Date

ALL Grade 7 Classes will have their Chapter 10 Test on Thursday June 4th, 2015.

7D does not have a scheduled Science period that day; however, they will write the test during period 3 instead of Language that day.

Chapter 10 Links for Review

10.1 Quiz
https://sciencesource.pearsoncanada.ca/quizzes/quiz_10_1paqKt.htm

10.2 Quiz
https://sciencesource.pearsoncanada.ca/quizzes/quiz_10_2KLylM.htm

10.3 Quiz
https://sciencesource.pearsoncanada.ca/quizzes/quiz_10_3YEEdN.htm

10.4 Quiz
https://sciencesource.pearsoncanada.ca/quizzes/quiz_10_4fY7Rd.htm

10.1 Crossword
https://sciencesource.pearsoncanada.ca/puzzles/puzzle_10_1/

10.2 Crossword
https://sciencesource.pearsoncanada.ca/puzzles/puzzle_10_2/

10.3 Crossword
https://sciencesource.pearsoncanada.ca/puzzles/puzzle_10_3/

10.4 Crossword
https://sciencesource.pearsoncanada.ca/puzzles/puzzle_10_4/

Chapter 10 Review Quiz
http://wps.pearsoned.ca/ca_school_ontarioscience_7-8/102/26141/6692106.cw/content/index.html

Chapter 10 Matching Terms
https://sciencesource.pearsoncanada.ca/resources/gr7_matchquiz_ch10/

Chapter 10 Labeling Practice
https://sciencesource.pearsoncanada.ca/resources/gr7_labelquiz_ch10/

Convection Example Video
https://sciencesource.pearsoncanada.ca/resources/battlingbottles.php

Heat Radiation Animation
https://sciencesource.pearsoncanada.ca/resources/radiation.swf

Conduction, Convection, Radiation Animation
http://www.wisc-online.com/objects/heattransfer/

Pop-Can Implosion Video
https://sciencesource.pearsoncanada.ca/pgs/video.php?id=12

Adding Heat to Particles Activity/Animation
https://sciencesource.pearsoncanada.ca/resources/slg.swf

Forms of Energy Matching
https://sciencesource.pearsoncanada.ca/resources/03_forms.swf

Thermal Radiation Face Matching
http://spaceplace.nasa.gov/ir-matching/en/

Energy Transformation Activity
http://www.phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=cad&wcsuffix=1020

Information About Energy Transformations
http://www.energykids.eu/energy-transform

Types of Energy PowerPoint
https://sciencesource.pearsoncanada.ca/pgs/resource.php?found=slideshow_gr7_pg283_energyforms.ppt&plevel=7

Energy Transformation PowerPoint
https://sciencesource.pearsoncanada.ca/pgs/resource.php?found=slideshow_gr7_pg284_transform.ppt&plevel=7

How a Thermometer Works
http://www.energyquest.ca.gov/how_it_works/thermometer.html

What is an Expansion Joint
http://en.wikipedia.org/wiki/Expansion_joint

Beat the Heat! Game
http://spaceplace.nasa.gov/beat-the-heat/en/

Infrared Image Game
http://spaceplace.nasa.gov/ir-photo-album/en/

Radiation Video Viewed in Class

Convection Video Viewed in Class

Conduction Video Viewed in Class and Worksheet Answers

Conduction

On a cold winter day, why would an iron post in a park feel much colder to the touch than a wooden bench?

Iron is a better heat conductor than wood. The iron will conduct the heat away from your hand faster than wood; this makes your hand feel colder when you touch iron

Potatoes cook from the outside in.

a)     Why does a small potato cook faster than a large potato?

Smaller potatoes have fewer particles, so heat takes less time to reach the centre.

b)    Why does sticking a metal skewer through the middle of a potato make it cook faster?

Heat will be conducted through the skewer into the centre of the potato and it will cook from the inside out.

Energy Transformation Activities

Complete the following activities to review the concept of energy transformations.


http://www.phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=cad&wcsuffix=1020

https://sciencesource.pearsoncanada.ca/resources/03_forms.swf

Grade 8 Media Assignment Due Tuesday May 19th

Review the lyrics and watch the video for"World on Fire" by Sarah McLachlan and write and answer the following questions:

a.       How do the lyrics share the message of the song? Consider words, phrases, literary devices, poetic devices.

b.      How did the music change or enhance the meaning of the words

c.       How did the images change or enhance the meaning of the words

d.      In your interpretation, what is the meaning of this song?

"World On Fire"

Lyrics by Sarah McLachhlin

Hearts are worn in these dark ages
You're not alone in this story's pages
The light has fallen amongst the living and the dying
And I'll try to hold it in, yeah I'll try to hold it in

[Chorus]
The world's on fire and
It's more than I can handle
I'll tap into the water
(Try and bring my share)
I try to bring more
More than I can handle
(Bring it to the table)
Bring what I am able

I watch the heavens but I find no calling
Something I can do to change what's coming
Stay close to me while the sky is falling
Don't wanna be left alone, don't wanna be alone

[Chorus]

Hearts break, hearts mend
Love still hurts
Visions clash, planes crash
Still there's talk of
Saving souls, still the cold
Is closing in on us

We part the veil on our killer sun
Stray from the straight line on this short run
The more we take, the less we become
The fortune of one that means less for some

[Chorus X2]

Temperature vs. Thermal Energy

Key Terms

Temperature – The average speed of the particles in a substance (we use a thermometer to take the temperature)

Heat – Is the thermal energy transferred from an area of higher temperature to lower temperature

Thermal Energy – This is the total energy of moving particles (kinetic energy) in a solid, liquid, or gas (requires measurement of mass and speed of particles)

When viewing the video below, please substitute the term "Heat" with "Thermal Energy". This is consistent with the definition of thermal energy we learned in class.

Chapter 8 Retest Date Tuesday May 19th

There will be a retest on Tuesday May 19th @ 11:55 AM in room G6 for any students who would like to improve their marks.

The test will be out of 20 marks and can raise your marks up to a 10% to a maximum of 70% on the test.

Please review the following:

1. Describe a solution in quantitative and qualitative terms; e.g., reduce a 30g/300ml solution to 10g/100ml, this would be a dilute solution (not a concentrated one) a concentrated solution would have an amount of solute that is more than half of the volume of the solvent e.g., 55g/100ml (p. 217)

2. Definitions of solubility: The term solubility has more than one meaning (p. 216)

a) Solubility is the relative ability for a solvent to dissolve a solute

b) Solubility is the maximum amount of a solute than can dissolve in a solvent at a given temperature

3. Saturation of solutions: There are three levels of saturation of solutions"

a) unsaturated: More solute can dissolve

b) saturated: No more solute can dissolve

c) super saturated: A saturated solution has been cooled below a critical temperature; more solute is dissolved than should be at that temperature

4. Factors affecting solubility and the rate of dissolving (p. 221-223)

a) temperature

b) stirring 

c) particle size

d) type of solute or solvent

e) volume of solute or solvent

4. Separating solutions and mechanical mixtures *use the textbook section 8.3 and package worksheets*

Separating solutions

a) evaporation

b) distillation

c) paper chromatography

Separating mechanical mixutres

a) sifting (solids from solids)

b) sorting (appearance)

c) magnetism (attraction to metals)

d) settling (gravity)

e) use a separating funnel (different densities of fluids)

f) filtering (different states of matter)

g) flotation (densities again)

5. All bolded key terms: e.g., alloy, soluble, insoluble, etc.

Answers to Expansion and Contraction Worksheets

Solids Expanding and Contracting in our Daily Lives

1.   Why is it important to place gaps at regular intervals in sidewalks?

In the summer the sidewalk expands and in the winter it contracts. The gaps allow space for the expansion and contraction so the sidewalk doesn’t crack.

2.   Steel bolts used to connect things together are sometime heated and put in place while they are still hot. Why?

When hot, the length of the bolts increases. So when they cool, they pull together the parts they are fastening.

3.   Concrete and steel expand at almost the same rate. Explain why this is important in the construction of tall buildings.

If they did not expand and contract at the same rate, there would be many cracks in the building and it might fall down.

Gases Expanding and Contracting in our Daily Lives

1.   Explain how a hot air balloon is lifted from the ground.

When the gas particles inside the hot air balloon are heated, they expand and some escape from the bottom of the balloon. This causes there to be fewer air particles inside the balloon then outside the balloon. The less dense hot air will float on more dense cold air so the balloon rises.

c) Once in the air, the burner is turned off and the balloon drifts along with the wind. What will eventually happen to the air inside the balloon?

Cooler air will enter the balloon and the air inside will become more dense. The balloon will begin to go down.

Liquids Expanding and Contracting in our Daily Lives

1.   A bowl of hot soup was left on the table to cool. After a few minutes, the amount of soup in the bowl appeared to have decreased? Why?

Some of the soup may have evaporated or the soup may have cooled down and there seems to be less soup because the particles become closer together (contract) and become denser.

2.   When manufacturers pack liquids into bottles and jars, they leave a small space at the top before putting on the lids. Why?

The space allows for the liquid to expand without causing the bottle to break.

3.   Mercury expands and contracts faster than alcohol. Which liquids would be better in a thermometer?

Mercury will tell the temperature faster, but it will also contract faster so it will drop more quickly making it harder to read the temperature. Also, mercury is poisonous!

Expansion and Contraction Video and Convection Video Viewed in Class

Videos about Hot Air Balloons Viewed in Class

Web Activity to Help Explain Energy Transformations

Visit the site below for a simple demonstration of energy transformations.

http://www.energyeducation.tx.gov/energy/section_1/topics/energy_transformations/index.html

Answers to Energy Transformation Activities

Activity 1 – Stretch Your Mind

This station requires you to shoot an elastic band. Be very safe. You must wear safety goggles at this station.

Experiment 1 – Stretch the elastic band and aim it at the target at the wall. Release the elastic band as you are aiming at the target.

1.      Describe what happened as you released the elastic band.

2.      What energy transformations are taking place?

2. Chemical energy in our bodies to mechanical energy of our arms to elastic potential energy to mechanical energy and gravitational energy to sound energy and thermal energy

Experiment 2 – Place the elastic band against your wrist and feel its temperature. Holding the elastic band (don’t let go during this experiment) stretch and release the elastic ten times. Test the temperature against your wrist immediately after the tenth test

.

1.      What changes in temperature did you notice?

2.      How can you explain the change in temperature using energy transformations?

2. Chemical energy to mechanical energy to elastic energy (friction creates thermal energy)

Activity 2 – A Bright Idea

This station has a battery, two wires and a pair of light bulbs hooked up in a circuit. If the circuit is not attached, find a way to make the light turn on.

Experiment – Turn the switch on and off.

1.      Draw a diagram of the circuit.

2.      Identify what energy transformations are taking place when the switch is in the “on” position.

2. Chemical energy to electrical energy to light energy and thermal energy

Activity 3 – Ping Pong Paradox

This station has one ping pong ball. Please be careful not to bounce the ball too high.

Experiment – While standing, drop the ball from the height of 2 meters. Observe what happens. Wait until the ball stops bouncing before picking it up.

1.      What did you observe once you released the ball? Be sure to include what happened to the height of the ball as it bounced back each time.

2.      Why does the height of the ball change?

3.      What energy transformations are taking place during this experiment?

3. Gravitational energy to mechanical energy to sound and thermal energy to elastic energy to mechanical energy and back to  gravitational potential energy

Activity 4 – Hot Stuff!

This station has a hot plate. Be sure not to touch the hot plate or move it in any way. Please wear goggles at this station.

Observe the spiral.

1.      What observations can you make?

2.      What energy transformations are taking place?

2. Electrical Energy to thermal energy to the thermal energy of the air particles to mechanical energy of the spiral

Activity 5 – That’s Attractive!

This station has nails and a magnet. Be careful with the nails, they are sharp.

Experiment – Use the magnet to pick up the nails.

1.      Draw a diagram of your observations

2.      What type energy can you describe?

2. Magnetic energy (a type of potential energy

Activity 6 – You Spin Me Around

This station has a hot light bulb. Be very careful not to burn yourself.

Experiment – Place the Radiometer in front of the light and turn on the light.

1.      Draw a diagram of what you observed.

2.      What energy transformations are taking place?

Electrical energy to light and heat energy (infra-red radiation) to thermal energy of air to mechanical energy of spinning wheel

Activity 7 – Good Vibrations

This station has some salt, a bowl and a pot. Please be respectful of the noise level and clean up any mess. Be sure that the plastic wrap is tight around the bowl before you begin.

Experiment – place some salt on the plastic wrap. Holding the metal bowl above the salt, hit the bottom of the metal bowl with the spatula.

1.      What did you observe when you hit the bowl with the spatula?

2.      Why do you think the salt moved?

3.      Explain what energy transformations are taking place.

3. Mechanical energy of arm to sound energy from bowl to mechanical energy of air to mechanical energy of aluminum foil to mechanical energy of salt particles

Activity 8 – The Fickle Nickel

This station has a glass bottle, a nickel and some water in a beaker. Please be careful not to break anything.

Experiment – Dip the top of the bottle and the nickel in the water. Place the nickel on top of the bottle. Be sure that the water is sealing any space between the bottle and the nickel. Place your hands around the bottle and hold them there.

1.      What did you observe once you held your hands against the bottle for a while?

2.      Why did the nickel move?

3.      What energy transformations do you think are taking place?

2. The nickel moved because the air inside the bottle was heated and expanded. The air pressure forced the nickel to move so the air could escape.

3. Chemical energy to thermal energy from body is transferred (radiated) to the bottle and then to the air inside the bottle. The air particles have thermal energy (kinetic) which speeds up and expands the air particles.