Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

General Chemistry I Exam - CHEM115 Fall 2006, Exams of Chemistry

Multiple choice questions from an exam in general chemistry i (chem115) held in the fall 2006 semester. The questions cover various topics such as chemical reactions, formulas, and properties of compounds.

Typology: Exams

Pre 2010

Uploaded on 08/07/2009

koofers-user-ne1
koofers-user-ne1 🇺🇸

10 documents

1 / 4

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Exam #2 General Chemistry I - CHEM115 Fall 2006 (115e2f06)
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. Calcium sulfate precipitates from aqueous solutions as CaSO4•2H2O. When it is heated at 235°C for three
hours, all of the water of hydration is lost. If 172.17 g of the dihydrate is heated as described, the mass of the
solid produced will be
a. 118.13 g
b. 136.14 g
c. 154.16 g
d. 172.17 g
e. none of these
____ 2. In the conversion of bromate ion to bromide ion in acid solution,
a. bromine is oxidized
b. bromine is reduced
c. oxygen is oxidized
d. oxygen is reduced
e. More than one of these answers are correct.
____ 3. A compound that dissolves in water to yield only a small concentration of ions is called
a. a nonelectrolyte.
b. a weak electrolyte.
c. a strong electrolyte.
d. a saturated electrolyte.
e. none of these
____ 4. If a solution containing 4.000 g of NaOH is exactly neutralized by 80.00 mL of an aqueous HCl solution, the
molarity of the HCl solution must have been
a. 0.001250 m
b. 0.001370 m
c. 1.250 m
d. 1.370 m
e. none of these
____ 5. A crystalline compound of formula Mg(NO3)2•6H2O loses some of its water of hydration when it is heated,
but undergoes no other chemical changes. When a 10.0 g sample is heated in this way, the residue weighs
7.19 g. What is the formula of the residue?
a. Mg2(NO3)2•11H2O
b. Mg(NO3)2•4H2O
c. Mg(NO3)2•3H2O
d. Mg(NO3)2•2H2O
e. Mg(NO3)2•H2O
____ 6. An oxidizing agent is a substance that
a. is oxidized
b. causes oxidation
c. causes reduction
d. provides oxygen
e. none of these
pf3
pf4

Partial preview of the text

Download General Chemistry I Exam - CHEM115 Fall 2006 and more Exams Chemistry in PDF only on Docsity!

Exam #2 General Chemistry I - CHEM115 Fall 2006 (115e2f06)

Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Calcium sulfate precipitates from aqueous solutions as CaSO 4 •2H 2 O. When it is heated at 235°C for three hours, all of the water of hydration is lost. If 172.17 g of the dihydrate is heated as described, the mass of the solid produced will be a. 118.13 g b. 136.14 g c. 154.16 g d. 172.17 g e. none of these ____ 2. In the conversion of bromate ion to bromide ion in acid solution, a. bromine is oxidized b. bromine is reduced c. oxygen is oxidized d. oxygen is reduced e. More than one of these answers are correct. ____ 3. A compound that dissolves in water to yield only a small concentration of ions is called a. a nonelectrolyte. b. a weak electrolyte. c. a strong electrolyte. d. a saturated electrolyte. e. none of these ____ 4. If a solution containing 4.000 g of NaOH is exactly neutralized by 80.00 mL of an aqueous HCl solution, the molarity of the HCl solution must have been a. 0.001250 m b. 0.001370 m c. 1.250 m d. 1.370 m e. none of these ____ 5. A crystalline compound of formula Mg(NO 3 ) 2 •6H 2 O loses some of its water of hydration when it is heated, but undergoes no other chemical changes. When a 10.0 g sample is heated in this way, the residue weighs 7.19 g. What is the formula of the residue? a. Mg 2 (NO 3 ) 2 •11H 2 O b. Mg(NO 3 ) 2 •4H 2 O c. Mg(NO 3 ) 2 •3H 2 O d. Mg(NO 3 ) 2 •2H 2 O e. Mg(NO 3 ) 2 •H 2 O ____ 6. An oxidizing agent is a substance that a. is oxidized b. causes oxidation c. causes reduction d. provides oxygen e. none of these

____ 7. After a chemical reaction was completed, the product was carefully weighed and the mass recorded. In order to calculate the percentage yield for the reaction, what additional information is required? a. the theoretical yield of the product b. the actual yield of the product c. the molar mass of the product d. all of these e. none of these ____ 8. Consider the unbalanced chemical equation, F 2 + H 2 O → OF 2 + HF. When the reaction is balanced with smallest integer coefficients, the coefficient for H 2 O is a. 1 b. 2 c. 3 d. 4 e. none of these ____ 9. Which element is oxidized in the reaction (unbalanced), MnO 4 -^ + SO 4 2-^ → Mn2+^ + S 2 O 8 2- a. Mn b. O c. S d. None; this is not a redox reaction. e. This cannot be determined without balancing the equation. ____ 10. When CrO 4 2-^ is converted to Cr3+, _____ electrons are _____ by each chromium atom. a. 5, lost b. 5, gained c. 3, lost d. 3, gained e. none of these ____ 11. A precipitate is observed to form when an aqueous solution of potassium phosphate is mixed with an aqueous solution of magnesium chloride. The net ionic equation is a. 3 Mg2+( aq ) + 2 PO → Mg 3 (PO 4 ) 2 ( s ) b. (^) Mg2+( aq ) + 2 Cl( aq )→ MgCl 2 ( s ) c. 3 K+( aq ) + PO ( aq )→ K 3 PO 4 ( s ) d. (^) K+( aq ) + Cl( aq )→ KCl( s ) e. none of these ____ 12. When nitric acid is added to calcium carbonate, a reaction occurs producing a. Ca2+( aq ) b. CO 2 ( g ) c. H 2 O(l) d. all of these e. none of these ____ 13. In the balanced chemical reaction, XeF 4 ( g ) + 2 H 2 O( g ) → Xe( g ) + 4 HF( g ) + O 2 ( g ), what mass of water is re- quired to react completely with 10.0 g of XeF 4? a. 0.87 g b. 1.20 g

Exam #2 General Chemistry I - CHEM115 Fall 2006 (115e2f06)

Answer Section

MULTIPLE CHOICE

1. B

2. B

3. B

4. C

5. D

6. B

7. A

8. A

9. C

10. D

11. A

12. D

13. C

14. B

15. E

16. A

17. C

18. C