Practice Questions - Resources

1. We are in danger of exhausting our supplies of copper because
(A) copper atoms are being widely distributed in the environment
(B) copper ores are being converted to copper metal
(C) copper atoms are being destroyed in chemical processes
(D) environmentalists want strict air pollution regulations

2. Which of the following processes requires the least amount of energy?
(A) recycling a used metal article
(B) reusing a metallic article
(C) processing virgin ore
(D) all require the same energy

3. A metal is usually obtained from its ore by a process called
(A) melting
(B) reduction
(C) oxidation
(D) casting

4. The likely formula for a compound formed from the elements calcium and oxygen is
(A) Ca₂O₃
(B) Ca₃O₂
(C) CaO
(D) Ca₆O₃

5. Which portion of our planet is the major "supply house" for the production of manufactured goods?
(A) mantle
(B) hydrosphere
(C) atmosphere
(D) lithosphere

6. Low-grade ores are less desirable than high-grade ores because they
(A) are more difficult to mine
(B) cost more per ton of ore
(C) are scarcer than high-grade ores
(D) require more energy for concentration

7. The fact that sodium is a more active metal than silver means
(A) sodium will reduce silver ions
(B) silver ions will gain electrons from sodium atoms
(C) sodium loses electrons more readily than silver
(D) all of the above statements are true

8. Which statement about reduction is not true?
(A) Reduction is always accompanied by oxidation.
(B) Reduction involves the gaining of electron(s).
(C) Reduction is the process whereby metals rust.
(D) Reduction of minerals can produce elemental metals.

9. The atomic number of an element is equal to the number of
(A) protons in each atom of the element.
(B) electrons in each atom of the element.
(C) neutrons in each atom of the element.
(D) both A and B

10. How many atoms of carbon are needed to completely react with each formula unit of Fe₂O₃ to form Fe and CO?
(A) 1
(B) 2
(C) 3
(D) 6

11. When a solution of sodium chloride is vaporized in a flame, the color of the flame is
(A) blue
(B) red
(C) green
(D) violet
(E) yellow

12. Reducing agents
(A) gain electrons and get oxidized
(B) lose electrons and get oxidized
(C) gain electrons and get reduced
(D) lose electrons and get reduced

13. A mole of sulfur atoms has a mass of approximately 32 g. How many moles of sulfur atoms are in 16 g of sulfur?
(A) 0.25 mol
(B) 0.5 mol
(C) 2.0 mol
(D) 512 mol

14. Which reaction below can be considered as oxidation-reduction?
(A) HBr + NaOH ----> NaBr + H₂O

(B) CaS + CS₂ ------> CaCS₃

(C) NaCl -----> Na⁺ + Cl^-

(D) 2 C₈H₁₈ + 25 O₂ ----> 16 CO₂ + 18 H₂O

(E) Na₂S + NiCl₂ ---------> 2NaCl + NiS

15. Corrosion of metals can be prevented by sealing the surface with a nonreactive substance. Which gas is kept from reacting with the metal surface by this method?
(A) helium
(B) hydrogen
(C) oxygen
(D) nitrogen

16. What is the mass percentage of carbon in CO? (atomic mass of C = 12, O = 16)
(A) 75%
(B) 50%
(C) 43%
(D) 28%

17. Calculate the mass of a plastic brick measuring 2.00cm by 3.00cm by 1.50cm and having a density of 1.26g/cm³.
(A) 11.3 g
(B) 9.00 g
(C) 7.14 g
(D) 0.140 g
(E) 0.0882 g

18. Will the brick in question 17 float in water?
(A) Yes, all plastic floats in water.
(B) Yes, because it’s hollow on the inside.
(C) Yes, because plastic is less polar than water, so the intermolecular repulsion hold the plastic above the water.
(D) No, because the brick is more dense than water.
(E) No, because it’s made of solid plastic.

19. Which of the following contains the smallest percent mass of oxygen?
(A) SnO
(B) CuO
(C) CaO
(D) MgO
(E) H₂O

20. Electron shells are:
(A) The hard covering on an electron that hides the tender juicy morsel inside
(B) A new type of particle weapon being developed at the secret "skunk Works" division of the armed forces, designed to repel attacks from angry interstellar visitors
(C) The area in which electrons exist inside the atomic structure

21. Which solid reacts with dilute hydrochloric acid at 25^oC to produce a gas that is more dense than air?
(A) Zn
(B) Pb(NO₃)₂
(C) NaBr
(D) NaHCO₃

22. "Avogadro's Number" is...
(A) The number of the Chicago pizzaria where deep dish was born
(B) The title of a 1962 Fellini film, starring Marcello Mastrianni as a world-weary chemist, enticed by nursing student Sophia Loren
(C) The number of molecules in one mole of any gas

23. Which of the following is the smallest in volume?
(A) proton
(B) ice crystal
(C) electron cloud of an oxygen atom
(D) nucleus of an oxygen atom
(E) water molecule

24. Oxygen combines with each of the following elements except one. Which one?
(A) iron
(B) aluminum
(C) argon
(D) magnesium

25. The compound Ba(C₂H₃O₂)₂ ionizes into a barium ion and an acetate ion. Barium has two electrons in its outer shell. Upon ionization, what would you expect the charge on the acetate ion to be?
(A) +2
(B) +1
(C) -4
(D) -2
(E) -1

26. An atom that normally has _____ in its outer shell would tend not to form chemical bonds with other atoms.
(A) 6 electrons
(B) 8 electrons
(C) 3 electrons
(D) 4 electrons and 4 neutrons
(E) 1 electron and 1 proton

27. What is the molar mass of CaO ?
(A) 16 g
(B) 40 g
(C) 28 g
(D) 56 g
(E) 2 g

28. What is the appropriate designation for an atom containing 9 protons?
(A) Be
(B) C
(C) F
(D) O
(E) Ga

29. How many atoms are represented in the formula Ca(C₂H₃O₂)₂?
(A) 3
(B) 9
(C) 10
(D) 15
(E) 16

10 HI + 2 KMnO₄ + 3 H₂SO₄ -------> 5 I₂ + 2 MnSO₄ + K₂SO₄ + 8 H₂O

30. According to the balanced equation above, how many moles of HI would be necessary to produce 10 mol of I₂, starting with 16 mol of KMnO₄ and 12 mol of H₂SO₄?
(A) 20
(B) 10
(C) 8.0
(D) 5.0


ANSWERS

1-A 2-B 3-B 4-C 5-D 6-D 7-D 8-C 9-D 10-C 11-E 12-B 13-B 14-D 15-C 16-C 17-A 18-D 19-A 20-C 21-D 22-C 23-A 24-C 25-D 26-B 27-D 28-C 29-D 30-A