MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Transcription

1 Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The symbol for the element lead is. 1) A) Sn B) Pb C) Hg D) Ld 2) The law of constant composition applies to. 2) A) heterogeneous mixtures B) compounds C) homogeneous mixtures D) solids E) solutions 3) Which one of the following has the element name and symbol correctly matched? 3) A) Sn, silicon B) Mg, manganese C) Ag, silver D) C, copper E) P, potassium 4) Of the following, only is a chemical reaction. 4) A) tarnishing of silver B) dropping a penny into a glass of water C) dissolving sugar in water D) melting of lead E) crushing of stone 5) Of the following, only is an extensive property. 5) A) freezing point B) temperature C) density D) mass E) boiling point 6) Express the temperature, K, in degrees Celsius. 6) A) C B) C C) C D) C E) C 7) Which of the following liquids has the greatest density? 7) A) 3.5 cm3 with a mass of 10 g B) cm3 with a mass of 0.10 g C) 210 cm3 with a mass of 12 g D) 54 cm3 with a mass of 45 g E) 13 cm3 with a mass of 23 g 1

2 8) Accuracy refers to. 8) A) how close a measured number is to other measured numbers B) how close a measured number is to the true value C) how close a measured number is to the calculated value D) how close a measured number is to zero E) how close a measured number is to infinity 9) Which of the following has the same number of significant figures as the number ? 9) A) B) 100 C) D) 8.66 E) ) The number with the most significant zeros is. 10) A) B) C) D) E) ) In which one of the following numbers are none of the zeros significant? 11) A) B) C) D) 1065 E) ) Round the number to two significant figures. 12) A) 3400 B) C) 3500 D) 3000 E) ) One angstrom, symbolized Å, is m. 1 cm3 = Å3. 13) A) 1024 B) 1030 C) 10-9 D) E) ) Which of the following pairs of compounds can be used to illustrate the law of multiple proportions? 14) A) NH3 and NCl3 B) NO and NO2 C) ZnO and ZnCl2 D) H2O and HI 15) Which one of the following did Dalton not discuss in his atomic theory? 15) A) Any B) Ions C) isotopes D) protons 16) Which one of the following statements about atomic structure is false? 16) A) The electrons occupy a very large volume compared to the nucleus. B) Almost all of the mass of the atom is concentrated in the nucleus. C) The number of protons and the number of neutrons are always the same in the neutral atom. D) The protons and neutrons in the nucleus are very tightly packed. 17) Rhenium-185 has in its nucleus 17) A) 75 protons, 110 neutrons. B) 75 protons, 75 neutrons. C) 130 protons, 75 neutrons. D) 75 protons, 130 neutrons. 2

3 18) An ion is formed I. by either adding protons to or subtracting protons from the atom. II. by either adding electrons to or subtracting electrons from the atom. III. by either adding neutrons to or subtracting neutrons from the atom. 18) A) Only I is true. B) Only II is true. C) Only III is true. D) All of the statements are true 19) The ion 14N3- has 19) A) 7 protons, 7 neutrons, 4 electrons B) 7 protons, 7 neutrons, 7 electrons C) 7 protons, 7 neutrons, 10 electrons D) 7 protons, 14 neutrons, 7 electrons 20) Which element does not belong to the family or classification indicated? 20) A) As, lanthanides B) Co, transition metal C) As, lanthanides D) I, halogen 21) Select the group of symbols that would correctly complete the following statements, respectively. is the heaviest noble gas. 21) is the transition metal that has 24 electrons as a 3+ ion. is the halogen in the third period. is the alkaline earth metal that has 18 electrons as a stable ion A) Rn, Cr, Br, Ca B) Ra, Co, Cl, K C) Rn, Co, Cl, Ca D) Ra, Sc, Br, K ESSAY. Write your answer in the space provided or on a separate sheet of paper. 22) FIND YOUR PROBLEM Boron consists of 19.78% 10B with atomic mass of u and 80.22% 11B with atomic mass u. Calculate the atomic weight of naturally occurring Boron. 3

4 Atomic wt. = (0.1978)( u) + (0.8022)( u) = u u = u = amu Boron consists of 19.78% 10B with atomic mass of u and 80.22% 11B with atomic mass u. Calculate the atomic weight of naturally occurring Boron. Atomic wt. = (0.1978)( u) + (0.8022)( u) = u u = u = amu Boron consists of 19.78% 10B with atomic mass of u and 80.22% 11B with atomic mass u. Calculate the atomic weight of naturally occurring Boron. Atomic wt. = (0.1978)( u) + (0.8022)( u) 4

5 = u = u = amu Boron consists of 19.78% 10B with atomic mass of u and 80.22% 11B with atomic mass u. Calculate the atomic weight of naturally occurring Boron. Atomic wt. = (0.1978)( u) + (0.8022)( u) = u u = u = amu 23) FIND YOUR PROBLEM A hollow metal sphere has an outer diameter (o.d.) of cm and an inner diameter (i.d.) of

6 Vod = (4/3)( )(2.183 cm) 3 = cm 3 Vid = (4/3)( )(2.169 cm) 3 = cm 3 Vmetal = Vod Vid = cm cm 3 = cm 3 = cm 3 = 0.83 cm cm 3 x 3 = in 3 A hollow metal sphere has an outer diameter (o.d.) of 4.586cm and an inner diameter (i.d.) of Vod = (4/3)( )(2.293 cm) 3 = cm 3 Vid = (4/3)( )(2.251 cm) 3 = cm 3 Vmetal = Vod Vid = cm cm 3 = cm 3 = 2.72 cm cm 3 x 3 =0.166 in 3 A hollow metal sphere has an outer diameter (o.d.) of cm and an inner diameter (i.d.) of

7 Vod = (4/3)( )(2.308cm) 3 = cm 3 Vid = (4/3)( )(2.294 cm) 3 = cm 3 Vmetal = Vod Vid = cm cm 3 = cm 3 = 0.96 cm cm 3 x 3 = 0.96 in 3 A hollow metal sphere has an outer diameter (o.d.) of cm and an inner diameter (i.d.) of Vod = (4/3)( )( cm) 3 = cm 3 Vid = (4/3)( )(2.198 cm) 3 = cm 3 Vmetal = Vod Vid = cm cm 3 = cm 3 = 2.25 cm cm 3 x 3 =0.887 in 3 7