Practice questions for Exam 1.  CHEM 2090.  Fall 2004  Dr. Stone

Remember to show all of your work on your exams and quizzes.  

1. Which science is primarily concerned with the study of matter and the changes it undergoes?
2. Both mass and weight provide a measure of the amount of matter. Describe the difference between the two.
3. Briefly explain the Law of Conservation of Matter.
4. Give an example of a chemical change.
5. Give an example of a heterogeneous mixture.
6. Can you have a heterogeneous pure compound? Why or why not? 
7. How many centimeters are in 0.05 meters?
8. After a particularly grueling day studying for your chemistry exam, you reach for the Advil bottle to get some relief for your headache. Each tablet contains 0.200 g of ibuprofen (the active stuff). How many milligrams of ibuprofen in in each tablet?
9. If an aspirin contained 10 gr per tablet and the regular dose was 600 mg, how many tablets should you give? (1 gr = 60 mg)
10. How much does a 181 kg man weigh in lbs?
11. Give an example of a physical change.
12. How many mL are in 10 L?
13. The specific heat of ethanol is 0.590 cal/gramC and the specific heat of water is 4.184 g/mL. If the same amount of energy is put into 1L flasks of each, which solution will be hotter? Why?
14. Analysis of acetic acid yields 14.6g carbon, 2.36 g hydrogen and 19.28 g oxygen. Calculate the mass percent of each element.
15. What is the atomic number of an atom?
16. Which sub atomic particle has the smallest mass?
17. For a ¹²C atom, how many protons, neutrons and electrons are there?
18. What is an isotope?
19. How many electrons are in the outer shell of Neon?
20. What is the mass of 60 mL of pure ethanol? The density of ethanol is 0.793g/ml.
21. A sample of urine weighed 32.56g at 4C; an equal volume of water at the same temperature weighed 28.38g. At 4C, the density of water is 1.0000g/ml. What is the specific gravity of this urine sample?
22. How many millimeters are in an inch? (There are 2.54 cm/in.)
23. If the speed limit is 70. km/hour, what is the speed limit in miles/hour?
24. Express 0.00568 in scientific notation.
25. The specific heat of water is 1.0 cal/gC. Compare the energy needed to heat a pan (1 L) of water from 60F to 212F with the energy needed to heat up a swimming pool(3000 L) from 60F to 80F. Which one will require more energy?
26. How many electrons are in the outer shell of a halogen?
27. How many orbitals are in the p shell?
28. Which of the following sets are all non metals?
29. What positively charged ion is represented by this electron configuration: 1s² 2s² 2p⁶
30. What is the formula for dinitrogen monoxide?
31. What kind of bond is present in a molecule of nitrogen, N₂?
32. What is the compound formed when lithium reacts with fluorine?
33. What is the name of NaCO₃?
34. Give an example of a molecule that is polar. Show its dipole moment.
35. What is formula for Calcium phosphate
36. What is the name of HCN?
37. Mr. Stone had problems with his back, so his chiropractor recommended that he refrain from lifting anything over 20 lbs. Mr. Stone went into the Winn Dixie grocery store to get bread when he found that Diet Pepsi (a favorite of Mrs. Stone) was on SALE for $0.99 per 2 liter bottle. Since he went in to get just bread, Mr. Stone did not have a cart. How many 2 liter bottles of diet pepsi could Mr. Stone carry to the check-out with out violating the chiropractor's recommendation and risk further injury to his back? The density of Diet Pepsi is 1.0 g/ml. The bread weighs 1 pound.