chem

5. What is the correct answer reported to the proper number of significant figures for the following? 0.031 x 10.267 = ? a. 0.32 b. 0.318 c. 0.3183 d. 0.31828 e. 0.318277

a. 0.32

4. Give the number of electrons in O2-. a. 10 b. 13 c. 8 d. 10

a. 10

3. How may significant figures are there in the number 0.11? a. 2 b. 3 c. 4 d. 5 e. 6

a. 2

12. How many significant figures are in the measurement, 0.0100g? a. 3 b. 4 c. 5 d. 6

a. 3

What is the identity of element X if the ion X3+ contains 10 electrons? a. Al b. S c. He d. Mg

a. Al

9. Which of the following has the same empirical formula as CH2? a. C2H4 b. SO2 c. CH4 d. C3H8

a. C2H4

1. Which type of bond involves a sharing of electrons between 2 atoms? a. Covalent bond b. Ionic bond

a. Covalent bond

30. Write the formula for the compound formed between magnesium and oxygen. a. MgO b. MgO2 c. Mg2O d. Mg2O3 e. Mg3O2

a. MgO

23. Which charge is more likely to exist (common)? a. Na+ b. Li2+ c. Rb- d. Cl+

a. Na+

24. What is the chemical symbol for tin (be familiar with some unusual names)? a. Sn b. Si c. Cu d. S

a. Sn

11. Matter whose composition may vary from one sample to another is an _____? a. mixture. b. an element. c. a compound. d. an proton.

a. mixture.

15. The atomic number is equal to a. the sum of the number of the protons. b. the sum of the number of the electrons. c. the sum of the number of protons, neutrons, and electrons. d. the sum of the number of protons and neutrons.

a. the sum of the number of the protons.

14. Convert 0.65 kilograms to grams. (1000g = 1 kg) a. 0.059 b. 650 c. 65,000 d. 0.0015

b. 650

8. Convert 25.0 cm to inches. (1 inch = 2.54 cm) a. 2.54 x 10-1 in b. 9.84 in. c. 11.92 in. d. 3.75 x 102 in

b. 9.84 in.

41. Which of the following molecular compound (s) are correctly named? I. BrCl = bromine monochloride II. CBr4 = carbon tetrabromide III. NO2 = nitrogen dioxide IV. SCl3 = sulfur trichloride a. I only b. II only c. III & IV only d. I & IV only e. All are correct

e. All are correct

34. What is the name of the following compound: TiO2? a. titanium oxide b. timenton (IV) oxide c. titanium (II) oxide d. titanium (IV) oxide

d. titanium (IV) oxide

36. Determine the name for CS2. a. carbonaceous sulfur b. monocarbon sulfurous c. carbon sulfur d. carbon (IV) sulfide e. carbon disulfide

e. carbon disulfide

33. Which of the following is a transition metal? a. chlorine b. hydrogen c. nitrogen d. oxygen e. iron

e. iron

49. Which of the following are an example of a "molecular element"? A. O2 B. CO2 C. Fe D. NO3-

A. O2

50. What is the formula for sodium bicarbonate? A. Na2CO3 B. NaCO3 C. NaHCO3 D. Na(CO3)2

C. NaHCO3

47. Which of the following contains covalent bonds only? A. CaI2 B. CoS C. CaCO3 D. SO3

D. SO3

48. Which of the below acids is named hydrochloric acid? A. HClO B. HClO2 C. HClO3 D. HClO4 E. HCl

E. HCl

46. Identify the unit of measurement which is a SI base unit of measurement. A. second B. Celsius C. cup D. pound E. meter

E. meter

In his 1789 textbook, Antoine Lavoisier listed 33 elements, one of which was Brass. Which of the following observations best shows that Brass CANNOT be an element? a. Brass is insoluble in water b. Brass is formed as the sole product when two elements combine together. c. Brass has a density of 3.28 g/cm3. d. Brass melts at 1250oC

b. Brass is formed as the sole product when two elements combine together. c. Brass has a density of 3.28 g/cm3.

32. What is the chemical formula for copper(II) cyanide? a. Cu3CN b. Cu(CN)2 c. Cu2CN d. CuCN3

b. Cu(CN)2

26. Which of the following elements is a halogen? a. Ne b. F c. O d. Ba e. K

b. F

21. What species is represented by the following information? p+ = 25 n° = 28 e- = 21 a. Cl- b. Mn4+ c. Ni4+ d. Ni4+ e. Mn4-

b. Mn4+

40. Which one of the following is the correct formula resulting from a combination of the common ions from these elements: Na and P? a. NaP b. Na3P c. Na3P2 d. NaP3 e. None of the above

b. Na3P

31. When Group I elements form ions, they: a. lose one proton b. lose one electron c. gain two electrons d. lose two protons

b. lose one electron

18. Identify the how the atom is organized at the subatomic level: a. neutrons and electrons in nucleus; protons form the cloud outside the nucleus. b. protons and neutrons in nucleus; electrons form the cloud outside the nucleus. c. neutrons in nucleus; protons and electrons form the cloud outside the nucleus. d. protons and electrons in nucleus; form the cloud outside the nucleus.

b. protons and neutrons in nucleus; electrons form the cloud outside the nucleus.

Give the number of protons in Mg+2. a. 10 b. 16 c. 12 d. 14

c. 12

25. Which is not a main group element? a. Na b. F c. Cr d. Cs

c. Cr

16. Which of the following names for some of these ions are correct? I. PO3-3 = phosphite ion II. CN- = cyanide ion III. BO3-3 = borane trioxide ion IV. CO3-2 = carbon trioxide ion a. I only b. II only c. I & II only d. II, III & IV only e. All are correct

c. I & II only

2. Which one of the following is an ionic compound? I. (NH4)2CO3 II. NaHCO3 III. CH4 IV. CO2 a. I only b. II only c. I & II only d. III & IV only e. None of the above are correct.

c. I & II only

42. Which one of the following is the correct formula resulting from a combination of the common ions: Ni+4 and PO4-3 a. NiPO4 b. Ni2PO4 c. Ni3(PO4)4 d. Ni3(PO4)3 e. None are correct.

c. Ni3(PO4)4

Which of the following elements is an alkaline earth metal? a. K b. Cu c. Sr d. Fe e. Br

c. Sr

35. Which compound will be considered a binary ionic compound? a. iron (III) hydroxide b. copper (II) sulfate c. magnesium sulfide d. carbon dioxide

c. magnesium sulfide

17. What is the correct answer reported to the proper number of significant figures for the following? 0.881 x 0.201 = ? a. 0.177081 b. 0.17708 c. 0.1771 d. 0.177 e. 0.18

d. 0.177

43. How many protons, neutrons, and electrons are found in a 68Br- isotope? a. 68 protons, 103 neutrons, and 69 electrons b. 33 protons, 35 neutrons, and 34 electrons c. 33 protons, 35 neutrons, and 32 electrons d. 35 protons, 33 neutrons, and 36 electrons e. 35 protons, 33 neutrons, and 34 electrons

d. 35 protons, 33 neutrons, and 36 electrons

6. Convert 4.80 x 10-8 g to pg (pico grams) 1 pico = 1 x 10-12 a. 4.80 x 1020 pg b. 4.80 x 10-20 pg c. 4.80 x 102 pg d. 4.80 x 104 pg e. 4.80 x 10-4pg

d. 4.80 x 104 pg

45. How many significant figures are there in the number 2.0020? a. 2 b. 3 c. 4 d. 5 e. 6

d. 5

What is the density, in g/cm3, of a metal cube with a mass of 12.3 g and an edge length of 1.25 cm. V=(edge length)3. a. 2.05 g/cm3 b. 28.5 g/cm3 c. 2.70 g/cm3 d. 6.30 g/cm3

d. 6.30 g/cm3

7. Atoms can be described as a. Mixtures of two or more pure substances. b. Mixtures of two or more elements that has a specific ratio between components. c. Two or more atoms chemically joined together. d. Are the fundamental

d. Are the fundamental building blocks of ordinary matter.

37. Which of the following contains ionic and covalent bonds? a. NaI b. Fe2O3 c. CaS d. CuSO4 e. CO2

d. CuSO4

38. Which of the following acid's are correctly named? I. HClO3 = chloric acid II. H2SO3 = sulfurous acid III. HNO2 = hyponitrous acid IV. H2CO3 = carbonous acid a. All are correct b. I only c. III only d. I & II only e. I, II & IV only

d. I & II only

44. Which one of the following is an ionic compound ? I. K2SO4 II. BaCl2 III. CO2 IV. SO3 a. I only b. II only c. I & IV only d. I & II only e. I, II & IV only

d. I & II only

39. What is the formula of the compound, manganese (II) nitrite? a. Mg(NO3)2 b. Mg(NO2)2 c. Mn(NO3)2 d. Mn(NO2)2 e. Mo(NO2)2

d. Mn(NO2)2

20. Which charge is less likely to readily exist (that is not a common ion)? a. Na+ b. Ba2+ c. Cl- d. N3+

d. N3+

29. An ionic bond is best described as a. the sharing of electrons between atoms. b. he transfer of electrons. c. a bond between a metal and a nonmetal. d. a bond formed between a cation and a anion. e. a bond between two polyatomic ions.

d. a bond formed between a cation and a anion.

Isotopes of the same element differ in the number of a. electrons b. neutrons and protons c. protons d. neutrons e. atomic number

d. neutrons