Practice Exam 1 Essay

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d 1.

What is the correct formula for the carbonate ion? (a) CH3COO(b) Cl(c) CO22(d) CO32(e) (COO-)2

c 2.

What is the name of Fe(OH)3? (a) (b) (c) iron hydroxide iron trihydroxide iron (III) hydroxide (d) (e) iron (II) hydroxide none of these

d 3.

From the following ionic compounds, choose the name-formula pair that is not correctly matched. (a) (b) (c) (d) (e) sodium sulfide ammonium nitrate zinc hydroxide sodium sulfate calcium oxide Na2S NH4NO3 Zn(OH)2 Na2SO3 CaO

b 4.

How many atoms of hydrogen are in 1.00 mole of water? (a) (b) (c) 6.02 x 1023 atoms 1.20 x 1024 atoms 1.81 x 1024 atoms (d) ( e) 2.41 x 1024 atoms 3.01 x 1023 atoms

a 5.

How many atoms of carbon are present in 34.5 g of caffeine, C8H10N4O2? (a)
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Naturally occurring silver consists of two isotopes. 107Ag (mass = 106.904 amu) and 109Ag (mass = 108.905 amu). What percentage of naturally occurring silver is the heavier isotope? (a) 52.6% (b) 45.4% (c) 48.2% (d) 51.7% (e) 62.7%

b 21.

Which of the following is an alkali metal? (a) Hf (b) Cs (c) P (d) He (e) Sr

a 22.

Which statement regarding nitric acid is false? (a) (b) (c) (d) (e) It only slightly ionizes in aqueous solution. Its solutions conduct electricity. It is soluble in water. It is a strong electrolyte. It produces H+ and NO3- in aqueous solution.

c 23.

Which one of the following substances is insoluble in water?

(a) Ba(OH)2 c 24.

(b) Na2S

(c) FeS

(d) NaOH

(e) K3PO4

Which one of the following is a weak electrolyte? (a) KBr (b) H2SO4 (c) H2CO3 (d) NH4ClO (e) Ba(OH)2

c 25.

What is (are) the spectator ion(s) in the following reaction? 2HClO4(aq) + Sr(OH)2(aq)  Sr(ClO4)2(aq) + 2H2O(l) (a) H+, OH(b) H+ (c) Sr2+, ClO4(d) Sr2+, OH(e) OH-

d 26.

Determine the oxidation number of the underlined element in K2CO3. (a) –1 (b) –2 (c) – 4 (d) +4 (e) +5

b 27.

Which of the following matched pairs of name and formula has an error? Name Formula (a) N2O4 dinitrogen tetroxide (b) P4O6 phosphorus hexoxide oxygen difluoride (c) OF2 (d) NO nitrogen monoxide (e) Mn2O7 manganese(VII) oxide What is the oxidizing agent in the following reaction?

b 28.

8H+(aq) + 3C2H5OH(aq) + Cr2O72–(aq)  2Cr3+(aq) +

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