1. Review for 11-2-17 Test 7th Grade

2. 1. I am a little dense sometimes
1. I am a little dense sometimes. I thought that if I cut a log with a density of .4g/ml in half that each half would be .2g/ml, but my wife says that this is not so. She is always right, can you explain to me why?

3. 1. Density is a characteristic property of matter and it does not change with size, so the density stays at .4 g/ml.

4. 2. Draw a picture showing how the following items would look if placed in a glass mug. Which would be on top and so forth. Water has a density of 1.0 g/ml A milkshake has a density of 1.1 g/ml Whip cream has a density of .2 g/ml Chocolate syrup has a density of 1.4 g/ml

5. Water has a density of 1. 0 g/ml A milkshake has a density of 1
Water has a density of 1.0 g/ml A milkshake has a density of 1.1 g/ml Chocolate syrup has a density of 1.4 g/ml
3. The drawing should show the least dense at the
top like below.
Whip cream has a density of .2 g/ml

6. 3. What is the difference between mass and weight
3. What is the difference between mass and weight? Answer in a complete sentence.

7. 3. Mass is the amount of matter and weight is due to gravity.

8. 4. If I went to Venus, which is a much smaller (it has less mass) planet than earth, how would my weight change, or would it change?

9. 4. If Venus has less massthan earth then the gravity will be less so weights will be less for the same objects.

10. 5. Fill in the blank. If you are traveling in a rocket ship, the closer you get to Earth, the ____________ your weight will be.

11. 5. The closer you are to something the stronger the gravity so the greater the weight.

12. 6. Name four characteristic properties of vinegar.

13. 6. Vinegar is clear, reacts with a base, is not flammable, smells sour, is liquid at room temperature, has a density close to water or 1g/ml.

14. 7. Arrange the following in order with the most energy to the left and the least energy to the right. Plasma, Liquid, Gas, Solid.

15. 7. Plasma, gas, liquid, solid

16. 8. Make a quick sketch of a graph showing a line that would represent ice being heated on a stove until it boils. Put time on the bottom and temperature on the side. Clues- There should be two flat horizontal lines on the graph. Label both of these.

18. 9. Describe the difference in the motion of the molecules of liquid water and molecules of steam.

19. 9. Steam is a gas so it has more energy than water as a liquid.

20. 10. The following is a data chart from a student’s lab report find 4 errors on it. Answers should be in tenths and watch the units.

22. 5.1g

23. 11. (5) The boiling point of benzene is 80 degrees centigrade
11. (5) The boiling point of benzene is 80 degrees centigrade. You are given a beaker of benzene at room temperature, 23 degrees centigrade. After placing the beaker of benzene on a hot plate it boils at 5 minutes. You continue heating the benzene for another 5 minutes and there is still some benzene left in your beaker. .

24. Draw a likely graph below of your results showing the starting temperature of the benzene, and the rest of the graph for the total 10 minutes of the experiment. Remember to label axis and use correct units.

25. You would need to show 10 minutes on the bottom of the graph
You would need to show 10 minutes on the bottom of the graph. The graph starts at 23 degrees and then goes flat at 5 minutes at 80 degrees for the rest of the graph. Ask me if this does not make sense.

26. That’s all folks. Think snow.