The Chemistry

1. The formula of chloric acid is HClO3. a) true b) false.  2. Bases react with active metals to produce hydrogen gas. a) true b) false.  3. Aqueous solutions of acids and bases conduct electricity. a) true b) false.   4. The piece of lab equipment shown is used to dispense precise volumes. What is this piece of lab equipment called? a) pipette b) burette c) volumetric flask d) graduated cylinder.   5. Which of the following solvents is often described as the universal solvent? a) hydrochloric acid b) water c) ethanol d) carbon tetrachloride.  6. Solutions have a fixed composition. This means that the amount of solute in a fixed amount solvent is always the same. a) true b) false.   7. 96.3 g of potassium iodate is used to prepare 300.0 mL of solution. What is the molar concentration of the solution? a) 5.7 mol/Lb) 7.4 mol/L c) 1.5 mol/L d) 1.9 mol/L.   8. Which factor does not affect the rate of dissolving? a) agitation b) amount of solvent c) particle size d) temperature.  9. One thousand parts per billion equal one part per million. a) true b) false.  10. A solution with a pH of 3.4 is three times more acidic than a solution with a pH of 6.4. a) true b) false.  11. Water and oil-based paint are said to be miscible. a) true b) false.   12. Decreasing the size of bluestone (copper (II) sulfate pentahydrate) crystals by crushing them allows more bluestone to dissolve in the same amount of water. a) true b) false.   13. Solid solutions of metals are called alloys. a) true b) falls.  14. Solubility is affected by agitation, temperature, and pressure. a) true b) false.  15. To prepare a 0.35 mol/L solution of calcium chloride, you add 19.4 g of CaCl2 to enough water to form 500 mL of solution. a) true b) false.    16. A pH of 3.0 means that the concentration of hydrogen ions is 3.0 x 10-7 mol/L. a) true b) false.  17. When a solution is made, there is no chemical reaction. The solution can be separated into its components mechanically (evaporation). a) true b) false.  18. When an acid solution is diluted, the pH of the solution increases. a) true b) false.  19. Which statement about water is false? a) It is made up of a polar molecule. b) It dissolves most polar compounds. c) It dissolves most non-polar compounds. d) It dissolves most ionic compounds.  20. A polar solvent cannot dissolve ionic and polar solutes. a) true b) false.  21. Concentration is the amount of solute per quantity of solvent. a) true b) false.  22. Acids are dangerous because they are corrosive, but bases are not as dangerous. a) true b) false.  23. Which of the following properties is not characteristic of an acid? a) turns phenolphthalein pink b) turns litmus paper red c) conducts electricity d) reacts with an active metal to produce hydrogen gas  24. What is the net ionic equation for the following reaction? a) b) c) d)  25. A solution is a heterogeneous mixture because it is composed of two substances, called the solute and the solvent. a) true b) false  26. A(n) ______ solution is a solution in which water is used as the solvent. a) homogeneous b) heterogeneous c) aqueous d) universal  27. In a ________, the concentration of a solution is determined quantitatively by observing and measuring the reaction of the solution with the second solution of known concentration. a) volumetric reaction b) precipitation c) neutralization d) titration   28. 26.9 g of silver nitrate is dissolved insufficient water to make 250 mL of solution. The solution’s molarity is: a) 0.108 M b) 0.158 Mc) 0.633 M d) 0.780    29. What mass of magnesium chloride, MgCl2 must be dissolved in 100.0 mL of water to produce a 2.5 M solution? a) 1.494 g b) 14.94 g c) 23.80 gd) 38.08 g  30. In a neutralization reaction, an acid and a base react to form: a) a precipitate and a gas. b) salt and water. c) an acid and a base.d) a solute and a solvent.    Calculations: You must show all your work in order to obtain full marks.  1. What precipitate is formed when solutions of aluminum nitrate and calcium chromate are mixed? (5 marks  2. What mass of precipitate is formed when 358 mL of 1.58 M CuNO3 is mixed with 491 mL of 0.87 M Ba(OH)2? (8 marks)   3. Titration is performed on a 25.0 mL sample of calcium hydroxide. A volume of 46.0 mL of a 0.15 M solution of nitric acid is used to reach the endpoint. Calculate the concentration of the calcium hydroxide. (8 marks)   4. A titration is conducted using nitric acid and potassium hydroxide. If 2051 mL of 1.4 M of the acid and 1679 mL of 0.83 M of the base is used, what is the final pH of the solution? (8 marks)

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