Exam 4 Sample Problems - 10)The oxidation number for...

Exam 4 Sample Problems
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10)The oxidation number for chromium in each of the following items respectively is: Cr 2 O 7 2- Cr 2 (SO 4 ) 3 CrO 3 A) +2, +2, +1 B) -2, 0, 0 C) +12,+3, +6 D) +6,+3,+6 16). (12 pts) Identify the type of each of the following chemical reactions using two terms for each: Use for set A Use for set B Single displacement Precipitation Double displacement Acid-base neutralization combustion Oxidation-reduction decomposition Gas forming combination Complete but do NOT balance the equations then use TWO terms to name each reaction Set A Set B a. ZnCO 3 ______+ _______ _____________ _______________ b. Ca + O 2 ____ ______________ _______________ c. CH 3 COOH + KOH ______+ _______ _____________ ______________ Complete the following table AND put an X in the box so show if the compound is soluble or insoluble name formula soluble insoluble copper (II) chloride Lithium carbonate Copper(II)sulfate pentahydrate X(free ) General group name:( ) RCOOH low molar mass HBrO 3 (NH 4 ) 3 PO 4 ------------------------------------------------------------------------------------------------------------ --------------------
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3) Balance the following equation. ____Mg 3 N 2 + ____H 2 SO 4 ____MgSO 4 + ____(NH 4 ) 2 SO 4 The SUM of all the coefficients (both reactants and products) is: a) 4 b) 6 c) 12 d) 9 e) 18 4) In the reaction Na + H 2 O NaOH + H 2 The oxidizing agent is: A) Na B ) H 2 O C) NaOH D) H 2 E) not a REDOX 5) Compounds A and B both contain Carbon, Hydrogen and Oxygen. They were tested using a light bulb conductivity apparatus and the results are recorded. Solution: Pure liquid A Pure Liquid B Liquid A dissolved in water Liquid B disso in water Light Bulb Observation: Does not light up Does not light up Does not light up Dim Which describes the compounds? A) A is ionic; B is a strong acid B) A is a soluble non-electrolyte: B is a weak acid C) A is weak acid ; B is strong acid D) A is covalent ; B is an alcohol 10) In the reaction A 2B You calculate that to reach a theoretical yield of 20 moles of B you need 10 moles of A . If the reaction has only a 75% yield how many moles of A must you react initially to achieve your original theoretical yield of 20 moles of B. A) 10 moles B) 7.5 mole C) 13.3 moles D) 15 moles E) need more data. 13) Write out the NET IONIC EQUATION for the reaction in water: 2 HNO 3 + K 2 CO 3 2KNO 3 + H 2 CO 3 (hint write out the entire reaction with ions) _______+_______+_______+______==> _______ + ________+_______+______(no graded points) The SPECTATOR IONS are: A) K 1+ , NO 3 1 - B) CO 3 2- , H 1+ C) H 1+ , OH 1- D) There are no spectators
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