CHEM 1211 Module Five Exam Name:__________________

Module Five Part N: Multiple Choice Chapters 2,3,4 5 points

____1. Which of the following is equal to one mole of substance?

(A) 6.02 x 10²³ sodium atoms, Na

(B) 6.02 x 10²³ chlorine molecules, Cl₂

(C) 6.02 x 10²³ sodium chloride formula units, NaCl

(D) 6.02 x 10²³ chloride ions, Cl ^1-

(E) A & B are both correct

(F) C & D are both correct

(G) all of the above are correct

____2. Which of the following represents 1 mole of ozone gas, O₃?

(A) 6.02 x 10²³ ozone molecules

(B) 48.0 g ozone gas

(C) 22.4 L ozone gas at STP

(D) all of the above

(E) none of the above

_____3. What is the molecular mass of mercurous nitrate, Hg₂(NO₃)₂ ?

(A) 463.2 g/mol

(B) 477.2 g/mol

(C) 511.2 g/mol

(D) 525.2 g/mol

(E) 649.2 g/mol

(F) none of the above

_____4. If 0.125 mol of S combines with 0.250 mol of O, what is the empirical formula of sulfur oxide?

(A) SO

(B) SO₂

(C) SO₄

(D) S₂O

(D) S₄O

_____ 5. The insulating material Styrofoam is a polymer of styrene. Find the molecular formula of styrene given its percentage composition:

92.25% Carbon, 7.75% hydrogen.

The approximate molar mass is 90 g/mol.

(A) C₁H₁

(B) C₁H₈

(C) C₁H₁₂

(D) C₈H₈

(A) C₁₂H₁

_____6. What is the term that expresses the simplest whole number ratio of atoms in a molecule, or ions in a formula unit?

(A) chemical formula

(B) simplest formula

(C) molecular formula

(D) empirical formula

(E) mass ratio composition

(F) percentage composition

_____7. Which of the following is evidence for a chemical reaction?

(A) a gas is detected

(B) a precipitate is formed

(C) a color change is observed

(D) an energy change is noted

(E) both B & C are correct

(F) all are correct

(G) none of the above

_____8. What is the term for a compound that releases hydrogen ions when dissolved in water?

(A) acid

(B) aqueous acid

(C) base

(D) aqueous base

(E) none of the above

______9. The product(s) of a neutralization reaction is(are)

(A) water

(B) aqueous acid

(C) aqueous base

(D) salt

(E) aqueous acid and aqueous base

(F) aqueous acid and water

(G) salt and water

(H) aqueous base and water

(I) aqueous acid, water, aqueous base

(J) none of the above

______10. Ethane, C₂H₆, burns to give carbon dioxide and water. What is the coefficient of oxygen gas need to balance the reaction:

(A) 5

(B) 7

(C) 10

(D) 14

(E) none of the above

Use the following choice in questions 11-15 to classify each of the following chemical equations(unbalanced):

A. Combination (or synthesis)

B. Decomposition (or analysis)

C. Single replacement

D. Double Replacement

E. Neutralization

F. Combustion

_____11. C₅H₁₂ + O₂ ------> CO₂ + H₂O

_____12. K + S --------> K₂S

_____13. Al(OH)₃ + HNO₃ ---------> Al(NO₃)₃ + H₂O

_____14. Zn + HCl ---------> ZnCl₂ + H₂

_____15. KClO₃ ---------> KCl + O₂

More Stoichiometric Calculations:

Mole-Mole;

Mass-Mass,

% yield-impure Reagents,

Excess/Limit Reagent

Mixture

#16-#20 see online tests Chapter 4

also see Module 5 exam from exam menu