Chemistry Connections Sample Questions

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Passport to Science Exploration: Chemistry Connections Sample Questions —Students may use a periodic table for all questions below— (1) Zinc(II) acetate, Zn(C2H3O2)2, is a chemical compound that is often used to treat the common cold. What is the chemical formula of an acetate ion? A. C2H3O2 B. (C2H3O2)2 − C. C2H3O2 2− D. C2H3O2 (2) Cl2O7 is one of several oxides formed by chlorine and oxygen. What is the IUPAC name for Cl2O7? A. Chlorate B. Chlorine(I) oxide C. Dichlorine septoxide D. Dichlorine heptoxide (3) Based on the portion of the periodic table shown below, which element has the largest atomic radius? A. Argon B. Carbon C. Neon D. Silicon (4) When continually heated in a sealed container, ammonium chloride decomposes into ammonia and hydrogen chloride as shown in the reaction below. What must be true of this reaction? NH4Cl(s) ⇌ NH3(g) + HCl(g) A. The reaction can occur without heat if a catalyst is present B. The forward reaction has a lower activation energy than the reverse reaction C. The transition state of the forward reaction is less stable than the transition state of the reverse reaction D. ∆E of the forward reaction equals negative ∆E of the reverse reaction (5) Hydroxylamine, shown below, is used as a neutralizer in photograph developing solutions. What is the total number of electrons shared between atoms in one molecule of hydroxylamine? A. 4 B. 8 C. 10 D. 14 (6) Nitric oxide in the human body helps cells respond to their environment. The formation of nitric oxide, shown below, requires a greater amount of energy to break the N2 and O2 bonds than it releases when the NO bonds are formed. Which statement does not describe the formation of nitric oxide? N2(g) + O2(g) 2NO(g) A. A synthesis reaction B. An exothermic reaction C. An oxidation reaction D. A reduction reaction 2016-2017 Sample Questions – Chemistry Connections Copyright 2017 Chemical Educational Foundation® (7) Based on the pH values in the table below, which list of solutions is ordered from highest hydroxide ion concentration to lowest hydroxide ion concentration? Solution pH 1 4 2 12 3 9 A. 1, 2, 3 B. 1, 3, 2 C. 2, 3, 1 D. 2, 1, 3 (8) In which compound does strontium have the electron configuration of a noble gas? A. Sr2 B. SrCl C. Sr2Cl D. SrO (9) Calcium cyanide is used in mining to isolate precious metals like silver and gold. How many formula units of calcium cyanide can be formed from seven atoms of calcium, ten atoms of carbon, and nine atoms of nitrogen? A. 3 B. 4 C. 5 D. 7 (10) A double replacement reaction occurs between lithium sulfate and barium chloride. In the balanced chemical equation for this reaction, what are the products? A. 2LiCl + BaS B. 2LiCl + Ba(SH)2 C. 2LiCl + BaSO4 D. 2LiClO3 + BaSO4 2016-2017 Sample Questions – Chemistry Connections Copyright 2017 Chemical Educational Foundation® Answer Key See how you did! Check out the answers below. (1) C (2) D (3) D (4) D (5) B (6) B (7) C (8) D (9) B (10) C Please note: CEF does not endorse or approve the use of any CEF Challenge questions for the purposes of preparing for any level of the Challenge. Challenge competition questions (including the Challenge Qualifier) are for competition purposes ONLY. Students should NOT receive or use questions (from the current year or any previous years) at any point to study. Use of Challenge competition questions for study purposes is grounds for disqualification. 2016-2017 Sample Questions – Chemistry Connections Copyright 2017 Chemical Educational Foundation® .

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Multivalent Metals and Polyatomic Ions 1
Name Date Comprehension Section 4.2 Use with textbook pages 189–193. Multivalent metals and polyatomic ions 1. Define the following terms: (a) ionic compound (b) multivalent metal (c) polyatomic ion 2. Write the formulae and names of the compounds with the following combination of ions. The first row is completed to help guide you. Positive ion Negative ion Formula Compound name (a) Pb2+ O2– PbO lead(II) oxide (b) Sb4+ S2– (c) TlCl (d) tin(II) fluoride (e) Mo2S3 (f) Rh4+ Br– (g) copper(I) telluride (h) NbI5 (i) Pd2+ Cl– 3. Write the chemical formula for each of the following compounds. (a) manganese(II) chloride (f) vanadium(V) oxide (b) chromium(III) sulphide (g) rhenium(VII) arsenide (c) titanium(IV) oxide (h) platinum(IV) nitride (d) uranium(VI) fluoride (i) nickel(II) cyanide (e) nickel(II) sulphide (j) bismuth(V) phosphide 68 MHR • Section 4.2 Names and Formulas of Compounds © 2008 McGraw-Hill Ryerson Limited 0056_080_BCSci10_U2CH04_098461.in6856_080_BCSci10_U2CH04_098461.in68 6688 PDF Pass 77/11/08/11/08 55:25:38:25:38 PPMM Name Date Comprehension Section 4.2 4. Write the formulae for the compounds formed from the following ions. Then name the compounds. Ions Formula Compound name + – (a) K NO3 KNO3 potassium nitrate 2+ 2– (b) Ca CO3 + – (c) Li HSO4 2+ 2– (d) Mg SO3 2+ – (e) Sr CH3COO + 2– (f) NH4 Cr2O7 + – (g) Na MnO4 + – (h) Ag ClO3 (i) Cs+ OH– 2+ 2– (j) Ba CrO4 5. Write the chemical formula for each of the following compounds. (a) barium bisulphate (f) calcium phosphate (b) sodium chlorate (g) aluminum sulphate (c) potassium chromate (h) cadmium carbonate (d) calcium cyanide (i) silver nitrite (e) potassium hydroxide (j) ammonium hydrogen carbonate © 2008 McGraw-Hill Ryerson Limited Section 4.2 Names and Formulas of Compounds • MHR 69 0056_080_BCSci10_U2CH04_098461.in6956_080_BCSci10_U2CH04_098461.in69 6699 PDF Pass77/11/08/11/08 55:25:39:25:39 PPMM Name Date Comprehension Section 4.2 Use with textbook pages 186–196.
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