|
|
Mrs. Crannie's 8th grade Science |
|
Study GuidesTest # 4 - 11/8/11 Part A
H2 - circle the 2 2HCl - box around the 2 402 - box around the 4, circle the 2 CH4 - circle the 4 3CO3 - box around the first 3, circle the second 3 2NaOH - box around the 2 Part B C2H6 Molecules =1 Elements = 2 Atoms = 8 2MgO Molecules = 2 Elements = 2 Atoms = 4 4P4O10 Molecules = 4 Elements = 2 Atoms = 56 NH3 Molecules = 1 Elements = 2 Atoms = 4 3Al(OH)3 Molecules = 3 Elements = 3 Atoms = 21 2H2O2 Molecules = 2 Elements = 2 Atoms = 8 Part C 4P + 5O2 --> P4O10 P= 4 P= 4 O= 10 O=10 Balanced _________________________________________________________ HgO --> Hg + O2 Hg= 1 Hg=1 O= 1 O=2 Not Balanced (Balanced would be 2HgO --> 2Hg + O2) __________________________________________________________ BaCl2 + H2SO4 --> BaSO4 + 2HCl Ba= 1 Ba= 1 Cl= 2 Cl= 2 H= 2 H=2 S= 1 S=1 O=4 O=4 Balanced ________________________________________________________________ Test #3 - 10/21/11 Page 1
# of protons = 6 Element = carbon Page 2 group 13A and Period 3 = Aluminum group 2A and Period 2 = Beryllium Chlorine = Group 17A, Period 3 Magnesium = Group 2A, Peiod 3 Page 3 Sulfur has 6 valence electrons Selenium has 6 valence electrons Valence Electrons Sodium = 1 Chlorine = 7 Helium = 2 Boron = 3 Aluminum = 3 Carbon = 4 Calcium = 2 Sulfur = 6 Most Reactive = A (Lithium) Page 4 1. Proton = F 2. Neutron = A and H 3. Electron = G 4. Nucleus = B 5. Atom (has no answer) 6. Atomic Number = D 7. Atomic Mass = C 8. Energy Level = I 9. Valence Electrons = E 10. Element = J Atom = The smallest part of matter Test 1 - 9/13/11 1. C
2. D
3. B
4. C
5. D
6. C
7. A
8. C
9. A
10. B
11. C
12. Reaction
13. Inertia
14. Acceleration
15. Force
16. Action
17. Inertia
18. B
19. B
20. A
21. C
22. A
23. A
24. C
25. C
26. Newton's first law of motion states that an object at rest will remain at rest and an object in motion will remain in motion at a constant speed and direction unless acted upon by an unbalanced force. Examples will include flying forward when you step on the brakes, barbie flying out of her car and the soccer ball sitting on the field will not move until it is kicked. 27. Newton's second law of motion states that force= mass x acceleration. 2 objects of the same mass are kicked, the one kicked with a greater force will accelerate more. Also, if you have two objects, one with a large mass and one with a small mass, the one with the large mass will need more force to have the same acceleration. 28. Newtons third law of motion states that for every action there is an equal and opposite reaction. Examples could include that when you apply a force to an object you feel that force on your hand as a reaction force. Also we saw the newton's cradle and a rocket launch is an example of Newton's third law of motion. 29. Independent variable - amount of water given to bean plants, dependent variable - height of bean plant, constants - pot, amount of sunlight, amount of soil, type of soil, location of plants, amount of time to let grow. 30. Tie back hair, no baggy clothing, no dangling jewelry, No open flames near experiment, know the location of fire equipment, read chemical labels twice to be sure you have the right chemicals, no breathing in fumes, no horseplay, wear goggles. Test 2 - 9/27/11 Newton's Laws of Motion and Forces and Motion 1. F= 6 Newtons 2. m = 125 Kilograms 3. a = 3m/s2 4. v = 29 meters/second (should say North) 5. D = 228 meters 6. p = 23 kgm/s Which law? 3 1 2 3 1 vocab 1. Inertia = E 2. Mass = C 3. Gravity = B 4. Net Force = D 5. Force = A Inertia 2, 3, 4, 1, 5 Momentum 5, 1, 4, 3, 2 Understanding Net Force Left, 5N Right, 2N No Motion 30 Newtons F = 200 Newtons 7 Newtons Right m = 80kg 4 Newtons Right a = 6m/s2 Test 2 September 27th, 2011 Optional Review Sheet |
|
