Chemistry Practice Test Name: Date: Answer the following questions to the best of your ability. Make sure you read all questions carefully, and follow the instructions given PART A: Multiple choice For each of the following, circle the answer that is the MOST correct. 1. In what proportion are the atoms in C 2 H 6? a) 1:1 b) 1:3 c) 1:4 d) cannot tell from the formula 2. An element which has a shiny lustre, is bendable, and is a good conductor of heat and electricity can be classified as: a) metal b) non-metal c) noble gas d) metalloid 3. Which of the following is a non-metal? a) P b) Ca c) Ag d) Mn 4. Which of the following formulas represent the most atoms? a) Fe 2 O 3 b) Na 2 Cr 2 O 7 c) CuCrO 4 d) NH 4 NO 3 5. Which of the following is not a chemical change? a) natural gas burns b) dynamite explodes c) silver tarnishes d) dissolving salt 6. A precipitate: a) is a solution created when two materials are mixed b) is a reaction that gives off heat c) forms when light is given off during a chemical reaction d) is a solid produced when chemicals dissolved in water react 7.An oxygen atom gains two electrons to become an ion. The oxygen ion is which of the following? a) a cation b) an anion c) a charged ion d) a valence ion
8. A molecular compound is formed from: a) two metals b) two non-metals c) a metal and a non-metal d) two semi-metals 9. The alkaline earth metals would be expected to have an ionic charge of: a) +2 b) -2 c) +1 d) -1 10. If calcium has a valence of two and fluorine has a valence of one, the formula for calcium fluoride is given by: a) CaFl 2 b) CaF 2 c) Ca 2 F 2 d) Ca 2 F 11. What do you call a group of atoms that tend to stay together and carry an ionic charge? a) atomic ions b) polyatomic ions c) -ate ions d) ionic group 12. What type of reaction is occurring in the following equation? Sn + 2 Cl 2 -----> SnCl 4 a) synthesis b) decomposition c) single displacement d) double displacement 13. What type of reaction is represented by the following equation? 2Al(NO 3 ) 3 (aq) + 3Cu (s) ----> 3Cu(NO 3 ) 2 (aq) + 2Al (s) a) synthesis b) decomposition c) single displacement d) double displacement 14. When a chemist tests an unknown substance with blue litmus paper, the paper turns red in colour. The chemist concludes that the substance: a) is rich in molecules b) has a ph less than 7 c) is a base d) is pure water 15. What type of reaction occurs when acids react with bases? a) single displacement reaction b) decomposition reaction c) neutralization reaction d) synthesis reaction
16. Which of the following is a property of a base? a) sour taste b) tastes bitter c) turns blue litmus paper red d) ph is less than 7 17. Which statement is correct? a) ph 8.2 is 30 times more acidic than ph 11.2 b) ph 11.2 is 10000 times more basic than ph 8.2 c) ph 8.2 is 1000 times more acidic than ph 11.2 d) ph 11.2 is 30 times more basic that ph 8.2 18. Which is NOT an alkali metal? a) Na b) K c) Fr d) Ra 20. A halogen includes: a) Ne b) P c) I d) Si Part B: Short Answer 1. Explain the difference between ionic and molecular compounds. 2. Fill in the chart for each of the following elements/ions Element/Ion Atomic # 24 Mg 12 Mass # Charge Protons Neutrons Electrons S 2- Be 2+
3. Name the following compounds. Check the valence charges carefully for the transition metals. a) FeO b) Ba 3 P 2 c) Mn 2 O 3 d) H 3 PO 4 (aq) e) CBr 4 4. Write the formulas for the following compounds. a) magnesium oxide b) sulphur trioxide c) copper (II) sulphide d) calcium carbonate e) dinitrogen trisulfide 5. In an experiment, 47g of magnesium react with 82g of hydrogen chloride to produce a gas and 75g of another substance. a) Is it possible for these results to comply with the Law of Conservation of mass? (yes/no) b) Explain your answer to part a) c) What gas is produced?
d) How much of the gas is produced? e) How could you test for this gas? f) Write a balanced chemical equation for this reaction. 6. For each of the following word equations, write the skeleton AND balanced chemical equation. Indicate the type of reaction underneath the balanced equation. a. Copper (II) sulphide and sodium carbonate yield sodium sulphide and copper (II) carbonate. Skeleton Equation: Balanced Equation: Type of Reaction: b. Aluminum hydroxide and hydrochloric acid yield aqueous aluminum chloride and water. Skeleton Equation: Balanced Equation: Type of Reaction:
7. List three properties of acids and three properties of bases. 8. Complete and balance the following neutralization reactions a. KOH (aq) + HClO 3(aq)! b. Mg(OH) 2(aq) + H 2 SO 4(aq)! 9. Suppose that 5 drops of KOH (aq) neutralized 5 drops of a certain HBr (aq) solution. How many drops of the NaOH solution would be needed to neutralize 5 drops of an H 3 PO 4 (aq) solution having the same concentration as the HCl solution?