Grade 8 - Test- States of Matter

Answer Section (Model Answers)

 Multiple Choice

v  D

v  B

v  D

v  A

v  C

v  A

v  D

v  A

v  C

v  D

v  B

v  A

v  B

v  B

v  C

v  C

v  A

v  D

v  B

v  C

 Completion

v     gas

v     viscosity

v     solid

v     condensation

v     Charles’s law

v     evaporation

v     gas

v     endothermic

v     viscosity

MATCH   Matching

v  J

v  B

v  A

v  H

v  F

v  C

v  D

v  I

v  E

v  G

  Others

OTHER

v     C

v     B

v     A, gas; C, liquid; E, solid

v     B, condensation; D, freezing

Model Answers for worksheets of CH4: SEC1: ELEMENTS

Directed Reading B

SECTION: ELEMENTS

1. B                           11. Metals

2. C                           12. Nonmetals

3. B                           13. Metalloids

4. A                           14. C

5. B                           15. A

6. B                           16. B

7. A                           17. D

8. C                           18. A

9. D                           19. C

10. Elements             20. B

Review

1. Metals are good heat conductors, and nonmetals are poor heat conductors.

3. Possible answers: Yes, because metals conduct electric current and nonmetals don’t. Yes, because electric wires are made of copper or aluminum, which are metals. No, because some metalloids conduct electric current, so it may be possible to use metalloids as wires.

4. The elements are nonmetals because all of the elements that are gases are nonmetals and because metals conduct heat.

5. 100% - (92.7% + 6.9%) = 0.4%

Grade 8A

By Monday 6-12-2010 I expect ALL of you to submit me the following:

1- Science Fair Proposal Form.

2- Grading Rubric of the Science Fair Project Background Research Plan.

3- Question table of the Background Research Plan Worksheet.

Remember forgetting any of these will affect your research and overall grades of the first trimester.

Good Luck.

Grade 8B

Dear All,

Because of the too much arguments, aggressive behavior, and uncooperative manner most of you showed towards each other, these are the groups working together in the Science Fair Project. The groups are formed according to the following criteria:

1- No friends are to be together.

2- “A” students are to work with intermediate and low achieving students.

I expect all of you to adapt and start working; this was recommended by your Subject Leader Mrs. Hanan AlFred and we will not accept any objections from anyone, this is finalized. By the way remember working together means sharing. The output at the end can either be good or bad, it is all in your hands, however each member in a group has to work and be aware that if any student is reported not to be working well in his group, he is facing a big trouble regarding his/her grades. Remember you need the grade and you have to work very well to earn it with honor. I wish you the best.

Group 1:

1- Nourhan El Said

2- Mahmoud El Ghamrawy

3- Omar Yassin

Group 2:

1- Dina Saad

2- Yasmeen Samy

3- Aly Rabie

Group 3:

1- Nadeen Riad

2- Mona Abdou

3- Yehia El Beshir

Group 4:

1- Nadeen Fahmy

2- Farah Ouf

3- Mohamed El Gayar

Group 5:

1- Amina Salem

2- Mohamed Abou ElEzz

3- Yasmeen El Masry

Group 6:

1- Nour ElDin Nassar

2- Ahmed ElGarhy

3- Mourad Halbunie

Group 7:

1- Aliaa Fawzy

2- Aly Abou Rehab

3- Hana Shash

Group 8:

1- Ahmed Yehia

2- Hazem Yassin

3- Nada Wael

By Monday 6-12-2010 I expect ALL of you to submit me the following:

1- Science Fair Proposal Form.

2- Grading Rubric of the Science Fair Project Background Research Plan.

3- Question table of the Background Research Plan Worksheet.

Remember forgetting any of these will affect your research and overall grades of the first trimester. I will be in Lab 204 at the FIRST BREAK to receive your documents.

Good Luck.

Topics for Science Fair

From: http://www.juliantrubin.com/branchesofsciencefair.html

                                                     Branch: Chemistry

Water Chemistry:

1. Determine which added material will make ice melt fastest.
2. Find out if adding various amounts of different solutes to water will increases its boiling point.
3. Find out if adding salt, oil, detergent, and heating water could influence ordinary tap water's surface tension.

Acidity:

1. Using Pennies to Test How pH Affects Copper Corrosion.
2. See which of several substances has the most acidity by measuring CO₂ production when mixed with baking soda.

Temperature in Chemistry:

1. How Does Temperature Affect a Rubber Band's Elasticity?
2. The Effect of Temperature on the Water Solubility of Alum, Baking Soda, Epsom Salt, and Salt.

Compounds, Mixtures &Solutions:

1. Determine how the temperature of a mixture of water and ammonium nitrate changes with the amount of ammonium nitrate dissolved in the water.

From: http://www.juliantrubin.com/foodprojects.html

Chocolate, Candy and Sweets:

1. Use paper chromatography to see which dyes are used in the coatings of your favorite colored candies.

From: http://www.sciencebuddies.org/

1. Measuring the Surface Tension of Water.
2. Super cooling Water and Snap Freezing.
3. How Does Color Affect Heating by Absorption of Light?
4. Parachutes: Does Size Matter?
5. Race Your Marbles to Discover a Liquid's Viscosity
6. Rocketology: Baking Soda + Vinegar = Lift Off!
7. From Gas to Rust: Measuring the Oxygen Content of Air
8. Saturated Solutions: Measuring Solubility

                           Model Answers for Worksheets of Changes of State

DIRECT READING B: CHANGES OF STATE

1. Freezing

2. Melting

3. Evaporation

4. Condensation

5. Melting

6. Endothermic

7. Freezing

8. Exothermic

9. Evaporation

10. Change of state

11. C

12. D

13. Sublimation

14. Endothermic

15. B

Review

1. The particles of a solid only vibrate. The particles of a liquid can move past one another. The particles of a gas are free to move anywhere.

2. Energy is added or removed during a change of state. A change of state does not make a new substance, so changes of state are physical changes.

3. Melting requires energy. Freezing is the removal of energy. Both happen at the same temperature.

4. Both processes change a liquid to a gas. Evaporation is a slower process than boiling. In an open container, you need to heat a liquid in order to boil it.

5. Sublimation requires energy and changes a solid directly to a gas. Condensation gives off energy and changes a gas to a liquid.

6.

Property	Solid	Liquid	Gas
Attraction between particles	strong	weaker than in a solid	little or no attraction
Distance between particles	close	close	far apart
Movement of particles	They vibrate only.	They can move past each other.	There is freedom of movement.

Dear all,

I found some websites that could help in your search for a topic. Here are the websites below, if you want more, just Google science fair topics ideas for Middle school 

http://www.juliantrubin.com/branchesofsciencefair.html

Examples are:

http://www.juliantrubin.com/foodprojects.html

http://www.juliantrubin.com/topicprojects/interdisciplinarytopics.html--

http://www.juliantrubin.com/fairprojects/genetics/human_genetics.html

http://www.juliantrubin.com/fairprojects/earthsciences/earthquakes.html

This is interesting site too; you can type in the search box whatever branch of science you are interested in.

http://all-science-fair-projects.com/science_fair_projects.php?s_terms=Food%20Science%20&type=0&s_difficulty=&hidden=1&s_category=