Exam I Review Chapters 1, 2, and 3
Format of the test 20 multiple choice questions (no calculator) – 200 points Nomenclature (like quiz) – 100 points Reaction prediction – 25 points 3 problems – points vary – 175 points total Simple conversions… Combustion analysis! Stoichiometry/Limiting Reactant/% yield 1 bonus problem – 50 points max.
1. A small amount of salt dissolved in water is an example of a __________. A. homogeneous mixture B. heterogeneous mixture C. compound D. pure substance E. solid
2. Which one of the following is a pure substance? A. grape juice B. paper C. salt water D. gold E. milk
3. Which of the following could not be easily separated into its components by simple techniques such as filtering or decanting? A. heterogeneous mixtures B. compounds C. homogeneous mixtures D. compounds and homogeneous mixtures E. all of the above
4. For which of the following can the composition vary? A. pure substance B. element C. both homogeneous and heterogeneous mixtures D. homogeneous mixture E. heterogeneous mixture
5. Which one of the following is an extensive property? A. mass B. boiling point C. density D. specific heat capacity E. color
6. Which of the following is a chemical property of sodium chloride? A. It melts at a very high temperature. B. It is a solid at room temperature. C. It dissolves in water. D. It can be decomposed into sodium metal and chlorine gas. E. It is not significantly compressible
7. The law of multiple proportions is illustrated by which set of compounds? A. HCl, NaOH B. H 2 O, H 2 O 2 C. BaCl 2, NaCl D. NO 2, HNO 2
8. Which of the following has the same number of significant figures as the number kg? A. 1 x 10 6 B C D E. 100
9. Which isotope has 45 neutrons?
10. Isotopes are atoms that have the same number of _________ but differing number of _________. A. protons, electrons B. neutrons, protons C. protons, neutrons D. electrons, protons E. neutrons, electrons
11. A mass spectrum is observed with 3 peaks: (relative abundance = 51.3), (relative abundance = 100), and (relative abundance = 48.8). The compound is most likely A. F 2 B. Cl 2 C. Br 2 D. I 2
12.Which pair of elements below should be the most similar in chemical properties? A. N and O B. P and S C. K and Ca D. K and Mg E. Sr and Ba
13. An element in the upper right corner of the periodic table A. is either a metal or metalloid B. is definitely a metal C. is either a metalloid or a non-metal D. is definitely a non-metal E. is definitely a metalloid
14. Elements in Group 2A are known as the A. alkaline earth metals B. alkali metals C. chalcogens D. halogens E. noble gases
15. Which pair of elements is most likely to form a molecular compound? A. aluminum, oxygen B. magnesium, iodine C. sulfur, fluorine D. potassium, lithium E. barium, bromine
16. Element X reacts with sodium to form an ionic compound with the formula Na 2 X. Element X is a member of group A. 2A B. 15 (5A) C. 16 (6A) D. 17 (7A) E. 1A
17. The products of a complete combustion reaction are: a.H 2 O and CO b.H 2 O and CO 2 c.H 2 O 2 and CO 2 d.It is different for every reaction.
18. When lithium is added to water, the products are: A. Li 2 O and H 2 B. Li and H 2 O C. Li 2 O and H 2 O D. LiOH and H 2 E. LiOH and H 2 O
19.When a metal oxide is added to water, the product will be: a.Impossible to predict b.The metal hydroxide c.The metal oxide is insoluble d.Hydrogen gas and a metal hydroxide
20. Na 2 CO 3 + heat a.Na + CO 2 b.Na 2 O + CO c.Na 2 O + CO 2 d.Na 2 O + O 2 + CO
Answers 1. A11. C 2. D12. E 3. D13. D 4. C14. A 5. A15. C 6. D16. C 7. B17. B 8. C18. D 9. B19. B 10. C20. C