5 Salts and Solutions

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1 Aubrey High School Chemistry 5 Salts and Solutions Name Period Date / / 5.0 Practice Test You may use a pencil, eraser, and scientific calculator to complete the test. You will be given a periodic table and a solubility chart. No other resources are allowed. You have fifty (50) minutes to complete this test, unless other arrangements have been made. Please transfer your answers for questions in Sections 1 and 2 onto the Answer Document. Work for these questions will not be graded. However, sufficient and appropriate work must be shown for the Free Response questions in order to receive full credit. SECTION 1: A, B, or C. Determine whether each description refers to an acidic, basic, or neutral solution. (1 point each) (A) (B) (C) 1. Is purple with cabbage juice. Acidic Basic Neutral 2. Has a ph > 7.0. Acidic Basic Neutral 3. Often tastes bitter. Acidic Basic Neutral 4. Lye (drain cleaner). Acidic Basic Neutral 5. A solution of HNO 3. Acidic Basic Neutral 6. [H + ] = [OH ]. Acidic Basic Neutral SECTION 2: MULTIPLE CHOICE. Select the best answer choice for each question. (2 points each) 7. Which one of the following is the correct formula for aluminum oxide? (A) Al 2O 3 (B) Al 3O 2 (C) Al 6O 6 (D) AlO 10. Which one of these compounds does not dissolve in water? (A) (NH 4) 3PO 4 (B) CaCO 3 (C) K 2CrO 4 (D) Zn(NO 3) 2 8. What is the name of the compound CF 4? (A) carbon difluorate (B) carbon tetrafluoride (C) fluorocarbonate (D) tricarbofluoride 9. What is the name of the acid, HNO 3? (A) hydronitrate acid (B) hydronitric acid (C) nitric acid (D) nitrous acid 11. A lab uses a piece of chalk (CaCO 3) to form bubbles of CO 2. Which of the following is the correct symbol for these chemicals? (A) CaCO 3 (aq) and CO 2 (s) (B) CaCO 3 (g) and CO 2 (l) (C) CaCO 3 (s) and CO 2 (aq) (D) CaCO 3 (s) and CO 2 (g)

2 12. What is the concentration of a solution made by dissolving 12 grams NaOH in enough water to make 0.50 L of solution? Molar mass of NaOH = 40 g/mole (A) 0.60 M (B) 0.30 M (C) 1.2 M (D) 6.0 M 13. List the following solutions with an unknown solute in increasing concentration. X: g solute in a 500 ml solution Y: g solute in a 250 ml solution Z: g solute in a 250 ml solution (A) X < Y < Z (B) X < Z < Y (C) Y < X < Z (D) Y < Z < X 14. Which of the following substances is a base? (A) Ca(OH) 2 (B) H 2O (C) H 2SO 4 (D) HC 2H 3O A property of acids is that they (A) feel slippery. (B) neutralize water. (C) taste bitter. (D) taste sour. 16. A 100 ml sample of a solution with a concentration of 5.00 M is diluted by adding 300 ml of distilled water. The new concentration will be (A) 1.25 M (B) 1.66 M (C) 15.0 M (D) 20.0 M 17. If 50 ml of a 200 ml sample of 0.10 M sodium chloride solution is spilled, what is the concentration of the remaining solution? (A) M (B) M (C) 0.10 M (D) 0.20 M 18. According to Svante Arrhenius, acids are substances that (A) decrease the [H + ] (B) decrease the [OH ] (C) increase the [H + ] (D) increase the [OH ] 19. Each of the following can describe an aqueous solution with a strong electrolyte EXCEPT: (A) The solute dissociates completely into ions. (B) The solute is a covalent compound (C) The solute is a strong acid. (D) The solution contains a large amount of ions. 20. A substance that turns cabbage juice blue and only slightly lights up a light bulb is a: (A) strong acid (B) strong base (C) weak acid (D) weak base 21. A solution has an [H + ] = M. What is the [OH ]? (A) M (B) M (C) M (D) M 22. What is the hydrogen ion concentration, [H + ], of a solution in which the poh is 9? (A) M (B) M (C) M (D) M 23. Which of the following solutions may have a ph = 8.0? (A) Ammonia (B) Pool acid (C) Rubbing alcohol (D) Vinegar

4 SECTION 3: FREE RESPONSE. Show all your work to receive full credit. 24. Write the names or formulas for the following compounds. (Only the name and formula columns will be graded.) (10 points total; 2 per box) Name I/C/A Ions Formula (a) PBr 3 (b) Hydroiodic acid (c) FeCl 3 (d) Calcium phosphate (e) HNO What is the concentration of a solution when mol KBr is used to prepare a 600 ml solution (4 points) 26. How many grams of Ca(NO 3) 2 is needed to prepare 120 ml of a M solution? (4 points) 27. How many ml of a 6.0 M HCl solution are needed to prepare ml of a M solution? (4 points)

6 28. Complete the following table. (12 points total; 1 per box) [H + ] [OH ] ph poh Acid/Base/Neutral (a) M (b) 6.0 (c) Consider a solution of HF. (a) Write the reaction for the dissociation of HF in an aqueous solution. (2 points) (b) Draw how ten molecules of HF may be in the aqueous solution. (2 points) 30. Consider a solution of KNO 3. (a) Write the reaction for the dissociation of KNO 3 in an aqueous solution. (2 points) (b) Draw how ten molecules of KNO 3 may be in the aqueous solution. (2 points)

U N I T T E S T P R A C T I C E

South Pasadena Honors Chemistry Name 4 Salts and Solutions Period Date U N I T T E S T P R A C T I C E You may use a pencil, eraser, and scientific calculator to complete the test. You will be given a