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Chem 1010 - General Chemistry 1 » Fall 2021 » Chapter 3 Chemical Reactions (2)

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Question #1

Which of these shows the balanced reaction between aluminum hydroxide and sulfuric acid to yield aluminum sulfate and water?

A. 2 Al(OH)3(s) + 3 H2SO4(aq) → Al2(SO4)3(s) + 6 H2O(l)

B. Al(OH)2(s) + H2SO4(l) → AlSO4(s) + 2 H2O(l)

C. 2 Al(OH)3(s) + 3 H2S(g) → Al2S3(s) + 6 H2O(l)

D. 2 Al(OH)3(s) + 3 H2SO3(l) → Al2(SO3)3(s) + 6 H2O(l)

Question #2

Choose the balanced equation

A. H3BO3(s) → B2O3(s) + H2O(l)

B. N2(g) + 3 H2(g) → 2 NH3(g)

C. Fe(s) + H2O(g) → Fe3O4(s) + H2(g)

D. Fe(s) + Cl2(g) → FeCl3(s)

Question #3

Which shows the balanced reaction between iron(III) oxide and aluminum?

A. 2 Al(s) + Fe2O3(s) → Al2O3(s) + 2 Fe(s)

B. Al(s) + FeO2(s) → AlO3(s) + Fe(s)

C. Al(s) + Fe2O3(s) → Al3O2(s) + Fe(s)

D. Al(s) + Fe2O3(s) → AlO3(s) + Fe(s)

Question #4

Which of these equations is the balanced reaction between sulfurous acid and magnesium hydroxide?

A. H2SO3(l) + Mg(OH)2(s) → MgSO3(s) + 2 H2O(l)

B. H2SO3(l) + MgOH(s) → MgSO4(s) + 2 H2O(l)

C. H2S(g) + MgOH(s) → MgS(s) + H2O(l)

D. H2SO4(l) + Mg(OH)2(s) → MgSO4(s) + 2 H2O(l)

Question #5

Which of these compounds is insoluble in water?

A. KClO3

B. Pb(NO3)2

C. AgCl

D. MgCl2

Question #6

Which pair of species are the spectator ions in this reaction? 3 CaBr2(aq) + 2 Li3PO4(aq)→ Ca3(PO4)2(s) + 6 LiBr(aq)

A. Li+, Br-

B. Ca2+, PO43-

C. Ca2+, Br-

D. Li+, PO43-

Question #7

Which of these species is a strong acid?

A. K+

B. H2CO3

C. CH3NH2

D. HCl

Question #8

Choose the compound that has chlorine in the +5 oxidation state?

A. ClO2

B. NaClO

C. Fe(ClO3)3

D. SbCl5

Question #9

Which of these species can serve as a common reducing agent?

A. O2

B. Cr2O72-

C. Fe

D. F2

Question #10

Benzoic acid (C6H5COOH) and ethanol (CH3CH2OH) react according to this equation to produce C6H5COOCH2CH3: C6H5COOH(s) + CH3CH2OH(l) C6H5COOCH2CH3(s) + H2O(l) If 16.2 g C6H5COOH and 13.6 g CH3CH2OH are reacted, how many grams of C6H5COOCH2CH3 are produced?

A. 19.9 g

B. 13.2 g

C. 44.3 g

D. 52.8 g

Question #11

How many grams of aluminum oxide are produced by the complete reaction of 16.5 g aluminum with excess oxygen?

A. 31.2 g aluminum oxide

B. 62.4 g aluminum oxide

C. 8.73 g aluminum oxide

D. 41.6 g aluminum oxide

Question #12

How many grams of nickel(II) nitrate are needed to produce 36.9 g nickel(II) phosphate in the presence of excess sodium phosphate?

A. 29.0 g nickel(II) nitrate

B. 93.5 g nickel(II) nitrate

C. 18.4 g nickel(II) nitrate

D. 55.3 g nickel(II) nitrate

Question #13

Consider this reaction: CH3COOH(l) + CH3CH2OH(l) CH3C(O)OC2H5(l) + H2O(l) The actual yield is 73.3 g CH3C(O)OC2H5 . If you start with 52.9 g CH3COOH, what is the percent yield of this reaction?

A. 52.90%

B. 72.10%

C. 106%

D. 94.50%

Question #14

The following reaction has a percent yield of 88.4%. How many grams of carbon dioxide are produced from 77.7 g calcium carbonate via this reaction? 2 HNO3(aq) + CaCO3(aq) Ca(NO3)2(aq) + H2O(l) + CO2(g)

A. 38.6 g

B. 21.4 g

C. 30.2 g

D. 34.2 g

Question #15

A compound has a percent composition of 68.8% C, 4.92% H, and 26.2% O. Determine the empirical formula of this compound.

A. C4H3O

B. C6H6O2

C. C3H3O

D. C7H6O2

Question #16

Which equation shows the total molecular reaction between potassium carbonate and phosphoric acid?

A. 3 K 2 CO3(aq) + 2 H3PO4(aq) → 2 K3PO3(aq) + 3 H2CO3(aq)

B. CO3(aq) + 3 H+(aq) → 3 CO2(g) + 3 H2O(l )

C. 3 K2CO3(aq) + 2 H3PO4(aq) → 2 K3PO3(aq) + 3 CO2(g) + 3 H2O(l )

D. 3 K+(aq) + PO43-(aq) → 2 K3PO3(aq)

Question #17

Which species is being reduced in this reaction? SnO2(s) + C(s) Sn(s) + CO2(g)

A. SnO2

B. CO2

C. C

D. Sn

Question #18

Potassium hydrogen phthalate, KHC8H4O4, is used to standardize solutions of bases. The acidic anion reacts with bases according to this net ionic equation: HC8H4O4 -(aq) + OH-(aq) H2O(l) + C8H4O4 2-(aq) If a 0.8667 g sample of potassium acid phthalate requires 26.79 mL NaOH to react, what is the molarity of the NaOH?

A. 0.809 M

B. 0.158 M

C. 0.0324 M

D. 0.000158 M

Question #19

Calculate the number of milliliters of 0.773 M KOH needed to make 250 mL of a 0.220 M KOH solution.

A. 71.2 mL

B. 7.12 mL

C. 4.25 mL

D. 0.0712 mL

Question #20

How many grams of barium sulfate will precipitate when 15.0 mL of 0.393 M barium chloride is mixed with 15.0 mL of 0.325 M sodium sulfate?

A. 1.14 g

B. 0.57 g

C. 2.51 g

D. 1.38 g

Question #21

A soft drink contains an unknown amount of citric acid, C3H5O(COOH)3. A volume of 10.0 mL of the soft drink requires 6.38 mL of 9.370 × 10-2 M NaOH to neutralize the citric acid. Calculate the mass of citric acid present in 10.0 mL of the soft drink.

A. 3.83×10-2 g citric acid

B. 1.99×10-4 g citric acid

C. 0.345 g citric acid

D. 0.115 g citric acid

Question #22

What is the net neutralization reaction between hydrochloric acid and calcium hydroxide?

A. 2 H+(aq) + 2 Cl-(aq) +Ca(OH)2(s) → Ca2+(aq) + 2 Cl-(aq) + 2 H2O(l)

B. 2 HCl(aq) + Ca(OH)2(s) → CaCl2(aq) + 2 H2O(l)

C. H+(aq) + OH-(aq) → H2O(l)

D. 2 H+(aq) + 2 Cl-(aq) + Ca2+(aq) + 2 OH-(aq) → Ca2+(aq) + 2 Cl-(aq) + 2 H2O(l)

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