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JEOPARDY Third Nine Weeks9 weeks review El Dorado High School AZTECS 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500 Which of the following are found in pure water? A hydroxide ions B hydronium ions C water molecules D all of these A: D. all of these S2C04 Jeopardy Review What is the concentration of pure water at 25 °C? F 10-7 M G 7.0 M H 10.7 M 7 J 10 M A: F. 10 ^-7 S2C04 Jeopardy Review + H3O in An aqueous solution of sodium hydroxide reacts completely with a solution of hydrochloric acid. After all the water evaporates from the reaction mixture, what will remain? F sodium chloride G chlorohydroxide H sodium oxide J sodium chlorate A: F. sodium chloride S2C04 Jeopardy Review What is the most common oxidation number of combined sodium? F2 G1 H0 J +1 A: J. +1 S2C04 Jeopardy Review In balanced chemical equations, the sum of all the oxidation numbers is — A half of the number of elements B always +1 C always –1 D always zero0 A: D. always zero S2C04 Jeopardy Review In the reaction 2K + Cl2 → 2K+ + 2 Cl which element(s) is/are reduced? F K only G Cl2 only H both K and Cl2 J neither K nor Cl2 A: S2C04 Jeopardy Review G.) Cl2 only What are the oxidation numbers in the compound H2SO4? A.) H = +1, S = 0, O = 2 B.) H = +1, S = +6, O = -2 C.) H = -1, S = +7, O = 1 D.) H = +1, S = +1, O = 1 A: B. S2C04 Jeopardy Review What are the oxidation numbers in the compound NaCl? A Na = 0, Cl = 0 B Na = +1, Cl = -1 C Na = 1, Cl = +1 D Na = +2, Cl = 2 A: B.) S2C04 Jeopardy Review Which of the following statements is correct regarding oxidation and reduction processes? A Oxidation decreases the oxidation number. B Oxidation increases the oxidation number. C Reduction increases the oxidation number. D Oxidation and reduction have no effect on the oxidation numbers.I 400 S2C04 Jeopardy Review A: B. Which must be present for a piece of iron to rust? A carbon B chlorine C oxygen D sodium 500 A: C.) oxygen S2C04 Jeopardy Review In a redox reaction, the chemical which gains electrons is called the — A oxidizing agent B neutralizer TH C reducing agent D releasing agent A: S2C04 Jeopardy Review A What is the pH of a basic solution A: above 7 S2C04 Jeopardy Review For two acids of equal concentration, the stronger acid has — A a higher concentration of hydroxide ions B a higher pH C a higher concentration of hydronium ions D a stronger bond A: S2C04 Jeopardy Review C. Which of the following is used to calculate the average atomic mass of an element? F the naturally occurring isotopes GH the five most abundant isotopes H the isotopes that are man made J the least common isotopes A: F. the naturally occurring isotopes S2C04 Jeopardy Review How should the students check to make sure that the liquid in the beaker at the start is really the acid instead of the base? F Taste it to make sure it is sour. G Feel it between their fingers, bases are slick. H Check the pH meter reading. J Use all of the above to make sure. A: H. S2C04 Jeopardy Review A sample of fruit juice is found to have a hydrogen ion concentration of 2.87 x 10-4. What would the pH be? F 2.87 G 3.54 H 4.58 J 8.16 A. G. S2C04 Jeopardy Review What is the correct net ionic equation for the following formula: 1 Na2CO3(aq) + 1 FeCl2(aq) 1 FeCO3(s) + 2 NaCl(aq) A. Na+ + Cl- → NaCl B. 2Na+ + 2Cl- → 2NaCl C. Fe +2 + CO3 -2 → FeCO3 D. Fe+ + CO3- → FeCO3 A A. C. S2C04 Jeopardy Review What is the net ionic equation for the equation below: 1 Mg(OH)2(aq) + 2 HCl(aq) 1 MgCl2(aq) + 2 H2O(l) A: 2 H+ (aq) + 2 OH- (aq) 2 H2O S2C04 Jeopardy Review What is the pH of an acidic solution Th A: S2C04 Jeopardy Review below a 7 What is the pH and pOH for the given number [H+] = 2.0 x 10-3 M = A: pH= 2.70 S2C04 Jeopardy Review pOH= 11.3 What is the pH of a solution that has a pOH of 3.2? A: pH= 10.8 S2C04 Jeopardy Review What is the pH of a neutral substance? T A: S2C04 Jeopardy Review 7 What is the pOH of a solution if the [H+] is 3.4 x 10-5M? ______________ Is it an acid, base or neutral substance? T A: 9.53, Acid S2C04 Jeopardy Review Acids turn blue litmus paper ________________ T A: S2C04 Jeopardy Review red Bases turn red litmus paper __________________. C A: S2C04 Jeopardy Review Blue