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Do not write on the test. Fill in the answers on the answer sheet. Be sure you have your name (last name first, then first name) on the answer sheet and filled in the “bubbles” for the name.
- Which of the following is a strong acid? a. HBrO 2 b. HF c. HNO 2 d. HClO 4 e. CH 3 COOH
- Which of the following is a weak soluble base? a. Ca(OH) 2 b. H 2 NNH 2 c. CH 3 COOH d. HNO 2 e. HNO 3
- Which of the following is a strong (soluble) base? a. Ba(OH) 2 b. Fe(OH) 3 c. HCl d. NH 3 e. Mg(OH) 2
- Which of the following is a weak base due to the fact that it is only slightly soluble? a. Ca(OH) 2 b. HF c. CH 3 NH 2 d. Fe(OH) 3 e. LiOH
- Which of the following is a weak acid? a. HF b. HCl c. HI d. NH 3 e. H 2 NOH
- How much 0.132 M H 2 SO 4 solution is needed to neutralize 35.0 mL of 3.21 M NaOH solution? The reaction is:
2 NaOH + H 2 SO 4! Na 2 SO 4 + 2H 2 O
a. 213 mL b. 1701 mL c. 851 mL d. 426 mL e. 1.42 mL
- How much solid Ca(OH) 2 is required to neutralize 25.0 mL of 0.105 MHCl solution? The reaction is:
2HCl + Ca(OH) 2! CaCl 2 + 2H 2 O
a. 9.71 × 10!^2 g b. 1.313 g c. 0.194 g d. 0.389 g e. 194 g
*x indicates that the stoichiometry is not given.
- What is the concentration of a solution prepare by diluting 15.0 mL of 14.0 M HNO 3 to yield 500 mL of solution? a. 0.150 M b. 0.00187 M c. 535 M d. 0.420 M e. 2.38 M
- What is the product(s) for the reaction*:
PBr 5 + xH 2 O!?
a. H 3 PO 3 + HBr b. H 2 PBr 5 O c. H 3 PO 4 + HBr d. HPO 2 + HBrO e. HPO 2 + Hbr
- What is the product(s) for the reaction*:
SO 2 + xH 2 O!?
a. H 2 SO 4 b. H 2 SO 3 c.. H 2 S d. HSO 2 e. H 2 SO 2
- What is the product(s) for the reaction*:
CaO + xH 2 O!?
a. Ca(OH) 2 b. CaH 2 O c.. HCaO 2 d. CaOH e. H 2 CaO
- Which of the following (all are soluble) is a strong electrolyte? a. NH 3 b. HNO 3 c. CH 3 COOH d. FeCl 3 e. HF
- What is the oxidation number for oxygen in the compound KO 2? a. 0 b. +2 c. -2 d. -1 e. -1/
- What is the oxidation number for Cl in the compound Co(ClO 4 ) 3? a. 0 b. +1 c. +3 d. +5 e. +
- 15.0 g of KClO 3 is heated to yield 5.0 g of O 2 according to the reaction:
2KClO 3! 2KCl + 3O 2
What is the percent yield? a. 60% b. 85% c. 115 % d. 95% e. 20%
- What is the net ionic reaction which corresponds to the overall reaction:
CH 3 COOH + KOH! KCH 3 COO + H 2 O
a. CH 3 COOH + OH!^ ∫ CH 3 +^ + HCOOH
b. K+^ + OH!^! KCH 3 COH + H 2 O
c. H+^ + KOH ∫ K+^ + H 2 O d. CH 3 +^ + OH!^ ∫ H 2 O e. CH 3 COOH + OH!^ ∫ CH 3 COO!^ + H 2 O
The common polyions and the lazy person's guide to oxidation numbers Page 5
#Only the first hydronium from sulfuric acid is classified as weak.
- (^) These rules will work for almost everything you will see in General Chemistry. These are not necessarily as given by IUPAC.
Summary of the Common Polyions Polyanions: Name: ions acids
hypo...ite hypo...ous
... ite ... ous ... ate ... ic
per... ate per... ic
anions of: S chlor ClO!^ ClO 2!^ ClO 3!^ ClO 4!^ T A brom BrO!^ BrO 2!^ BrO 3!^ BrO 4!^ R C iod IO!^ IO 2!^ IO 3!^ IO 4!^ O I sulf( ur ) SO 22!^ SO 32!^ SO 42!^ #^ N D nitr NO 2!^ NO 3!^ G S phosph( or ) PO 23!^ PO 33!^ PO 43!^ anions of: carbon CO 32!^ W A acet CH 3 COO!^ E C mangan MnO 4!^ A I chrom CrO 42!^ K D dichrom Cr 2 O 72!^ S
Others you need to know: hydroxide: OH!^ (an anion) ammonium: NH 4 +^ (a cation)
The Lazy Person's Guide to Oxidation Numbers +
Use the following list as a hierarchy. When there is a conflict, the first rule given preempts the other rule(s). Learn the polyions - the charge of the polyions is as given in the table above. The sum of oxidation numbers for a molecule = 0, for an ion = charge. F =! 1 group 1 = +1 (old CAS group IA) group 2 = +2 (old CAS group IIA) Sc, Y and Al = + H = +1 or if combined with active metals only = - O =! 2 group 1 7 =! 1 (old CAS group VIIA) group 1 6 =! 2 (old CAS group VIA) group 1 5 =! 3 (old CAS group VA)
