Ch. 4

33. When calcium carbonate decomposes, according to the equation 2 Na + Cl2 2 NaCl, how many moles of NaCl are produced from the reaction of 10 mole of Cl2 ? A. 2 mole B. 5 mole C. 10 mole D. 20 mole

D. 20 mole

37. KBr(aq) + AgNO3(aq) AgBr(s) + KNO3(aq) is what kind of reaction? A. A neutralization B. An oxidation-reduction reaction C. An addition reaction D. A precipitation reaction

D. A precipitation reaction

16. What is the formula when an ionic compound is made from ammonium and sulfate? A. NH4(SO4)2 B. NH4SO4 C. (NH4)2SO4 D. (NH4)2(SO4)2

C. (NH4)2SO4

29. What is the mass of 0.5 mole of S atoms? A. 16 g B. 32 g C. 8.0 g D. 0.5 g

A. 16 g

35. When calcium carbonate decomposes, according to the equation CaCO3 CaO + CO2, how many grams of CO2 are produced from the decomposition of 520.0 g of CaCO3 ? A. 228.8 g B. 457.6 g C. 520.0 g D. 114.4 g

A. 228.8 g

11. What is the name of the ion, Mg2+? A. A) Magnesium ion B. B) Magnesium (II) ion C. C) Magneside ion D. D) Magnesium

A. A) Magnesium ion

8. How does the formation of a covalent bond occur? A. By the overlap of the electron orbitals of two atoms. B. By the loss and gain of at least one electron from two atoms C. By the loss and gain of no more than one electron from each of two atoms. D. By the creation of a new atomic orbital between two atoms.

A. By the overlap of the electron orbitals of two atoms.

4. When a compound forms because an electron or electrons is transferred from one element to another, it is referred to as what type of compound? A. Ionic B. Covalent C. Metallic D. Coordinate covalent

A. Ionic

17. What is the formula for an ionic compound made from magnesium and nitrate? A. Mg(NO3)2 B. MgNO3 C. Mg2NO3 D. (Mg)2NO3

A. Mg(NO3)2

1. What have thallium compounds been used for, historically? A. Rat poison. B. Fertilizer. C. Drain cleaner. D. Drug supplements.

A. Rat poison.

20. Dihydrogen monoxide is the best systematic name for what common substance? A. Water. B. Ammonia. C. Salt. D. Alcohol.

A. Water.

10. In the compound dichlorodifluoromethane, how many chlorine atoms does the name indicate are present? A) 1 B) 2 C) 3 D) 4

B) 2

30. The mass of 3.0 moles of NaCl is what? A. 3.00 g B. 175.5 g C. 58.5 g D. 19.0 g

B. 175.5 g

31. How many moles are in 64 g of CH4? A. 2.0 moles B. 4.0 moles C. 16 moles D. 76 moles

B. 4.0 moles

24. Why can't a chemical equation be balanced by changing the subscripts of the reactants and / or products? A. Because there will always be more reactants than products when using such a method. B. Because changing the subscripts means changing the identity of the chemicals. C. It just can't! D. None of the above; it can be balanced in this manner.

B. Because changing the subscripts means changing the identity of the chemicals.

12. What is the proper name for Br - ? A. Bromine ion B. Bromide ion C. Bromonium ion D. Bromine (I) ion

B. Bromide ion

6. What is the formula for the compound carbon tetrabromide? A. CBr B. CBr4 C. CBr3 D. CBr2

B. CBr4

25. What is the balanced form of this equation: H2 + Cl2 HCl ? A. 2H2 + 2Cl2 4 HCl B. H2 + Cl2 2 HCl C. H2 + Cl2 H2Cl2 D. 2H + 2Cl 2HCl E. 2H + 2Cl H2Cl2

B. H2 + Cl2 2 HCl

21. Which of the following is a diatomic element? A. Helium. B. Hydrogen. C. Hafnium. D. None of the above.

B. Hydrogen.

13. What is the correct formula of an ionic compound made only from sodium and oxygen? A. NaO B. Na2O C. NaO2 D. Na2O2

B. Na2O

15. The sulfate ion has what formula? A. SO3 2 B. SO 4 2 C. SO 4 D. SO3

B. SO 4 2

9. Which of the following is a covalent compound? A. MgO B. SO2 C. TiO2 D. MnO2

B. SO2

34. When calcium carbonate decomposes, according to the equation 2 Na + Cl2 2 NaCl, how many moles of Na are needed to produce 10 moles of NaCl ? A. 2 mole B. 5 mole C. 10 mole D. 20 mole

C. 10 mole

26. How does the equation Fe + O2 Fe2O3 appear when properly balanced? A. 4 Fe + 6 O Fe4O6 B. Fe + O2 Fe2O3 C. 4Fe + 3O2 2Fe2O3 D. 2Fe + 3O2 2Fe2O3

C. 4Fe + 3O2 2Fe2O3

18. What must be included in the formula of any ionic compound? A. Three or more elements. B. Positive and negative ionic charges. C. A cation and an anion, written cation first, followed by anion. D. Two or more elements, as well as positive and negative ionic charges.

C. A cation and an anion, written cation first, followed by anion.

27. How does the following appear when properly balanced: CH4+ O2 CO2 + H2O? A. 2CH4+ O2 2CO2 + H2O B. CH4+ 2O2 CO2 + H2O C. CH4+ 2O2 CO2 + 2H2O D. CH4+ O2 CO2 + 2H2O

C. CH4+ 2O2 CO2 + 2H2O

23. The products of a chemical reaction are commonly listed where? A. In the middle of a chemical reaction B. On the left of a chemical reaction C. On the right of a chemical reaction D. At either end of a chemical reaction

C. On the right of a chemical reaction

28. What does Avogadro's number, 6.02x10^23, indicate for an element, which is composed of atoms? A. The known quantity of atoms in a mass of a compound. B. The number of atoms in a mass of an element. C. The number of atoms in the atomic mass of an element. D. Nothing, really, just the number of atoms he counted in a sample of a

C. The number of atoms in the atomic mass of an element.

36. What do the combustion of gasoline and the rusting of iron have in common? A. Both occur on a long time scale. B. Both are single replacement reactions. C. Both are metathesis reactions. D. Both are redox reactions.

D. Both are redox reactions.

32. In the reaction: 2 Na + Cl2 2 NaCl, if 46.0 g of sodium react, what is the first step necessary in determining how much sodium chloride can form? A. Computing the number of atoms of sodium. B. Computing the number of moles of chlorine. C. Computing the number of grams of chlorine. D. Computing the number of moles of sodium.

D. Computing the number of moles of sodium.

7. Oxygen usually refers to what formula for the element? A. A) O3 B. B) O4 C. C) O D. D) O2

D. D) O2

14. What is the formula of an ionic compound made from chlorine and magnesium? A. ClMg B. Cl2Mg C. MgCl D. MgCl2

D. MgCl2

19. Which of the following are ionic compounds? A. CH4 and CCl4 B. NH3 and PH3 C. H2O and H2S D. None of the above. They are all examples of covalent compounds.

D. None of the above. They are all examples of covalent compounds.

22. What physical sense is not used in helping determine what an unknown substance might be? A. Sight. B. Touch. C. Smell. D. Taste.

D. Taste.

2. What is the name of the column in the periodic table that includes Na, Li, and K A. The main group metals B. The transition metals C. The alkaline earth metals D. The alkali metals

D. The alkali metals

5. What is the best way to describe all of the following: Mg, Ca, Be? A. They are compounds. B. They are elements. C. They are gaseous elements. D. They are alkaline earth elements.

D. They are alkaline earth elements.

3. Silver and gold are examples of what type of element? A. Main group non-metals B. Representative metals C. Main group metals D. Transition metals

D. Transition metals