Chemistry Final Review 1.Write the formula unit for Barium hydroxide. ans: Ba(OH) 2 2. Write the molecular formula for Trisulfur hexaoxide ans: S 3 O 6 3. How many moles are in 2.3 g of NaCl ans: moles 4. How many sig figs are in the answer in #3? ans: 3

5. In the reaction of Na + S 2  Na 2 S, write the molar ratio for Na/Na 2 S ans: 4:2 Na/S 2 ans: 4:1 6. Given 5 g of sodium, how many grams of Na 2 S will be produced? ans: 8.48 g Na 2 S 7. How many sif fig are expressed in #6 answer? ans: 3

8. Concern the reaction between, Cu + NaCl  What type of reaction may be represented? ans: single replacement Does this reaction form a produce? ans: No, Cu is less reactive than Na Would Cu replace Ag in AgCl 2 ans: yes, Ag is less reactive than Cu

9. Given 2Mg + PbCl 4  Pb + 2MgCl 2 Is this a good reaction? ans: yes, Mg is more reactive than Pb How many mole of PbCl 4 is needed to form 5.5 moles of MgCl 2 ? ans: 11 moles MgCl 2 How many grams of Mg is needed to produce 0.25 moles Pb? ans: 12 g Mg How many grams of MgCl 2 is produced from 56.4 g PbCl4? ans: 30.6 g MgCl 2

10. How many moles are in 5.6 g of CuCl 2 ? ans: moles CuCl How many molecules of O 2 is needed to burn 356 moles of CH 4 ? ans: 4.29 x molecules O Given 5.6 x molecules of Cu(NO 3 ) 2, how many grams would you have? ans: 1.75 g Cu(NO 3 ) 2 13.How moles are in 46 g C 2 H 5 OH? ans: 1 mole C 2 H 5 OH

14.Given 12 ml of O2 in 2.5 L of water, which is the solute? ans: O 2, of a lesser amount 15. A alloy is composed of 54% Cu and 46% Fe. Which is the solvent? ans: Cu, of a greater amount. 16.Oil will not mix in water. Oil is said to be: ans: immiscible in water 17.Is CaCO 3 soluble in water? ans: insoluble

18.What is the molarity of 0.45 mole of HCl in 35 ml of water? ans: 12.9 M HCl 19. How many grams of NaOH is needed to make 250 ml of 2 M NaOH? ans: 20 g NaOH 20.Given 54 g CaCl 2 dissolved in 150 ml, what is the molar concentration? ans: 3.3 M 21. Is the [OH - ] = 5.6 x from a pH = ans: no, pH = 5.75

22. What is the [H+] from [OH-] = 2.3 x ans: M 23. Is a solution with [OH-] = 8.3 x an acidic or basic solution? ans: basic, pH = What is the [H+] with a pH = 4.5 ans: [H+] = 3.16 x What is the pOH when the pH = 8.9 ans: 14 – 8.9 = 5.1

26.Is a solution basic or acidic with a hydrogen concentration of 1.2 x ? ans: basic, pH = Given a 6M HCl, what is the [H+] ? ans: HCl is strong, 100% dissociation making the [H+] = 6 M 28. What is the [H+] from pOH = 12.5 ans: What is the pH of the solution in #28? ans: pH = 1.5

30.Given the weak acid of HA with a Ka = 1.6 x : a. How much of the HA remains at equilibrium? ans: 0.25 – = b. What is the pH of HA? ans: pH = -log [H+] = With an increase in the temperature, there will be an ___________ in reaction rate. ans: increase

32. A catalyst will increase reaction rate by: ans: lowering the activation energy 33. A substance that slows reaction rate by interfering with reaction pathways is called ans: inhibitor 34.A reduction in the concentration of a substance would tend to ___________ reaction rate? ans: slow or reduce

35. What is the formula unit for Iron (III) oxide? ans: Fe 2 O True or false: a molecular compound is composed of a metal bonded to a non- metal? ans: False, this defines an ionic compound 37.The sharing of electrons tends to form what type of bond? ans: covalent bond

38.Which of the following are diatomic molecules: nitrogen, helium, argon hydrogen ans: N 2 and H 2 others are O 2, F 2, Cl 2, Br 2 and I How many atoms of chlorine are in Carbon tetrachloride? ans: What is the name of AgF ? ans: Silver (I) fluoride, MUST include Roman numeral with transisitional metal naming.

41. Name Cr(ClO 4 ) 4 ans: Chromium (IV) perchlorate 42. With ionic compounds a Roman numeral is used to identify the number of atoms present. In a molecule _______ is used to identify the number of atoms in a molecule. ans: prefix 43. What is the prefix for 6 ans hexa- 44. The prefix penta- means? ans: 5

45. Name the given compounds: a. HBr ans: hydrobromic acid b. H 2 SO 3 ans: sulfurous acid c. HClO 4 ans: perchloric acid d. HF ans: hydrofluoric acid

46. Write the formula for the following: a. Calcium hydroxide ans: Ca(OH) 2 b. Hydrosulfuric acid ans: H 2 S c. Chlorous acid ans: HClO 2 d. Oxalic acid ans: H 2 C 2 O 4

47. Identify the type of reaction and complete: a. CH 4 + O 2  ans: combustion, CH 4 + 2O 2  CO 2 + 2H 2 O b. NaNO 3 + Fe(SO 4 ) 2  ans: Double replacement 4NaNO 3 + Fe(SO 4 ) 2  2Na 2 SO 4 + Fe(NO 3 ) 4 c. Pb + Ca(OH) 2  ans: Single Replacement, but a check of the activity series indicate no reaction.

48. Would N 2 S 5 tend to form ionic or covalent bonds? ans: Non-metal bonded to non-metal is covalent. 49. The further apart two element are place on the periodic table, the __________ ionic the bond between then will be. ans; more 50. What is the molar mass of potassium dichromate? ans: K 2 Cr 2 O 7 has a mass of 294 g/mol

51. Food preservatives and weed killer are examples of: ans: an inhibitor 52. What affect would the increase in surface area have on reaction rates? ans: results in an increase 53. Energy based on position or composition is: ans: potential energy 54. The change in the amount of energy in a reaction is called: ans: enthalpy of the reaction

55.What is the average reaction rate if at time 2s the concentration was 0.02 M and at time 12 s the concentration is at 0.01 M ans: mole/L s 56. What does the (-) value indicate? ans: reduction in the [reactants] in time 57. The energy of motion is called: ans: kinetic energy 58. What concept is defined by mole solute/Kg solvent? ans: molality

59.Colligative properties are boiling point elevation, vapor pressure lowering, osmotic pressure and _______________. ans: freezing point depression 60. A _______ is exhibited by the Tyndall Effect ans: colloid 61. Which dissociation will result in a great depression of the freezing point of water? NaCl or MgCl 2 ans: MgCl 2 breaks into 3 particles

62.How much mass of water can absorb 4284 J of heat when the temperature changes from 20 oC to 38.2 o C? ans: 56.3 g 63. How many joules of heat is exchanged when 156 g of a substance cools from 85.2 o C to 5.6 o C. The Cp = J/g o C ans: J 64. What does the negative value in #63 mean? ans: energy is loss by the substance to the surrounding.

65.In the synthesis reaction of sodium in the present of molecular oxygen, what is the product? ans: Na 2 O 66. Will a precipitate form in the following reaction: Ca(NO 3 ) 2 + K 2 SO 3  ans: Yes, CaSO 3