AP Chemistry - Pre Test

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What science classes have you taken? (check all that you have taken)

CP Earth Science	CP Biology
Honors Earth Science	AP Biology

1. What volume of a liquid having a density of 1.48 g/cm³ is needed to supply 5.00 grams of the liquid?

0.296 cm³	3.38 cm³
1.48 cm³	7.40 cm³
2.26 cm³

2. The density of aluminum is 2.70 g/cm³. If a cube of aluminum weighs 13.5 grams, what is the length of the edge of the cube?

5.00 cm	0.200 cm
0.312 cm	1.25 cm
1.71 cm

3. The number, three hundred fifty thousand, written in scientific notation is best written as

350	3.50 x 10⁵
3.5 x 10⁶	3.50 x 10^-5
3.6 x 10⁵

4. Of the masses 86.30 g, 0.0863 kg and 8.630 x 10⁵ mg, which (if any) is the largest?

86.30

they are the same

0.0863 kg

two are the same, one is smaller

8.630 x 10⁵ mg

5. The following data was collected for an experiment with the buret:

      mass of flask: 21.45 g;
      initial volume reading: 10.09 mL
     final volume reading: 21.42 mL
      mass of flask + water: 31.67 g

Calculate

a. the mass of water
b. the volume of water
c. the density of water
d. the per cent error (if the correct density is .993 g/mL)

6. A cube of side length 8.00 cm has a mass of 200 g. What is its density?

7. What is the volume of 82.2 g of .786 g/mL liquid?

8. The environmental devastation caused by an "oil spill" is not new to the public. Given that the density of petroleum‑based oil is approximately 0.9g/ml and the density of water is 1.0g/ml, discuss the implications this has for aquatic life, possible oil fires, and clean‑up operations.

9. A letter has arrived for you that reads as follows:
Dear Cousin,
How are you? I hear you are taking AP Chemistry now. Maybe you can help me. I have been working in our mine and recently found a brilliant stone that looks like a diamond, but I am not sure. Do you know how I could determine its density? I read in a mineralogy magazine that diamond has a density of 3.51g/cm³. Please describe how I can determine the density of this stone, including the tools I need to buy, the measurement I need to make, and the necessary calculations. I hope you are enjoying your chemistry class.
Sincerely, Cousin Emma
Write a letter to Cousin Emma.

10. The particle diagrams below, which show atoms and/or molecules in three different samples of matter at STP.
phase diagram

Which sample represents a pure substance?

The following is an excerpt from the Handbook of Chemistry and Physics. Determine if each section is a physical properties or a chemical property.

Uranium, U atomic mass 238029, atomic number 92

11. Melting Point 1132.3C

12. Density 19.05g/cm³

13. Burns in Air between 150 and 175C

14. Reacts with acid to liberate hydrogen gas and the formation of salts with the 4+ oxidation state

15. Heat of Vaporization 460 KJ/mol

Chemical Know-How

Since you use many chemicals in the chemistry laboratory, it is important to know something about them. most chemicals are poisonous when they enter your body. many can burn or irritate your skin, eyes, and/or membranes of your digestive and respiratory tracts. Some chemicals destroy fabrics, especially those made from synthetic or protein fibers. chemicals can even make some things burn. generally, most chemicals combine at a reasonable rate; however, under certain conditions they can get out of control. knowing these things about chemicals helps you prevent accidents and work safely in the laboratory.

While working in the laboratory, why should you

16. wear safety goggles?

17. fasten long hair back?

18. wear a laboratory apron?

19. Use only the amounts and materials given in the experiment?

20. use only clean glassware?

21 Why are unused chemicals never returned to their original containers?

22. Why are bottles of chemical kept tightly closed except when a quantity of chemical is being removed?

23. Why must contact lenses be removed before you enter a chemistry lab?

24. State a reason why most chemicals are stored in glass or plastic containers rater than metallic ones.

25. Why are desk drawers and cupboard doors kept closed unless you are taking something out or putting it away?

26. Why is it important to work in a businesslike manner, quietly, and with a minimum of migration around the laboratory?

27. Why is it not advisable to eat or drink anything in a laboratory?

28. Why should you read the label on a bottle twice before you use any of its contents?

29. A cap, cork, or stopper from a bottle of liquid is not put down on a desk while you are pouring out some of the liquid. Why?

30. Explain the statement, "You are only as safe as the least safe person in the laboratory."

31. When you complete your lab report, what sections should be included? (from the website)

32. What is the difference between matter, elements, atoms, and molecules?

33. List the Physical properties of solids, and give an example of one.

34. List the Physical properties of liquids, and give an example of one.

35. List the Physical properties of gases, and give an example of one.

36. What is the law of constant proportions?

37. What are physical properties? Give two examples

38. What are chemical properties? Give two examples

39. What are extensive properties? Give two examples

40. What are intensive properties? Give two examples

41. What is a physical change? Give two examples

42. What is a chemical Change? Give two examples