CHEMISTRY 113 EXAM I(A)

Transcription

1 Summer 2003 CHEMISTRY 113 EXAM I(A) 1). Which of the following contains an elementary substance, a compound, and a mixture: A. Nitrogen, gold, and milk B. Silver, sodium chloride, and blood C. Air, coke, and salt water D. Gold, water, carbon dioxide 2). Which of the following is the highest temperature? A. 38 o C B. 96 o F C. 302 K D. the freezing point of water 3). How many significant figures are in the number? x 10 2 A. 8 B. 4 C. 5 D. 6 4). Express the following numbers in scientific (exponential) notation: A x x 10-4 B x x 10-4 C x x 10-4 D x10-4

2 5). Which of the following liquids has the greatest density? A. 13 cm 3 with a mass of 23 g B. 3.5 cm 3 with a mass of 10g C cm 3 with a mass of 0.10g D. 54 cm 3 with a mass of 45 g 6). One angstrom, symbolized as Å, is m. 1 cm 3 = A Å 3 B Å 3 C Å 3 D Å 3 7) The measured density of mercury is 13.6 g/cm 3. What volume in cm 3 will 2 lb of mercury occupy [1 lb = g]. A cm 3 B cm 3 C cm 3 D cm 3 8) In the periodic table, the elements are arranged in: A. alphabetical order B. order of increasing atomic numbers C. order of increasing metallic properties D. order of increasing neutron content 9). The elements Li, Na, K are: A. halogens B. alkaline-earth metals C. actinides D. alkali metals 10) The isotope 40 Ar contains: A. 18 protons and 22 neutrons

3 B. 40 protons and 18 neutrons C. 18 protons and 40 neutrons D. 40 protons and 40 neutrons 11). How many electrons are in the cation Ca 2+? A. 20 B. 18 C. 19 D ) When calcium reacts with sulfur the compound formed is A. Ca 2 S 2 B. Ca 3 S 2 C. CaS D. CaS 2 13) The name of the binary compound N 2 O 4 is: A. nitrogen oxide B. nitrous oxide C. nitrogen(ii) oxide D. dinitrogen tetraoxide 14) What is the coefficient of H 2 when the following reaction is balanced? K(s) + H 2 O KOH(aq) + H 2 (g) A. 1 B. 2 C. 3 D. 4 15) Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? A. H, Li

4 B. Ca, Sr C. Ga, Ge D. C, O 16) What is the mass % of carbon in dimethylsulfoxide, C 2 H 6 SO? A B C D ). Silver exists in two isotopes: 106 Ag with atomic mass and 107 Ag with atomic mass Using this and information from the periodic table, determine the percent abundances of 106 Ag and 107 Ag A and B and C and 60.8 D and ). Calculate the formula weight (FW) of the molecule of CaCO 3 : A B C D ) How many atoms of nitrogen are in 10 g of NH 4 NO 3? A. 3.5 B. 1.5x10 23 C. 3.0x10 23 D. 0.75x ) A mixture of 5 moles of C 2 H 4 and 3 moles of O 2 react to produce H 2 O and CO 2. Balance the reaction below and determine how many moles of the excess reactants will be left over when the reaction stops C 2 H 4 + O 2 CO 2 + H 2 O

5 A. 2 moles of O 2 B. 2 moles of C 2 H 4 C. 4 moles of C 2 H 4 D. 1 mole of O 2 Summer 2003 CHEMISTRY 113 EXAM I (B) 1). Which of the following contains an elementary substance, a compound, and a mixture: A. Hydrogen, gold, and milk B. Silver, sodium nitrate, and salt water C. Air, coke, and salt water D. Gold, acetic acid, nitrogen 2). Which of the following is the highest temperature? A. Boiling temperature of water B C C. 105 F D. 298 K 3). How many significant figures are in the number? x 10 3 E. 8 F. 4 G. 5

6 H. 6 4). Express the following numbers in scientific (exponential) notation: A x x 10-4 B x x 10-4 C x x ). Which of the following liquids has the greatest density? A. 18 cm 3 with a mass of 36 g B. 3.5 cm 3 with a mass of 20g C cm 3 with a mass of 0.010g D. 40 cm 3 with a mass of 30 g 6). One angstrom, symbolized as Å, is m. 1 mm 3 = A Å 3 B Å 3 C Å 3 D Å 3 7) The measured density of mercury is 13.6 g/cm 3. What volume in cm 3 will 3 lb of mercury occupy [1 lb = g]. A cm 3 B cm 3 C. 100 cm 3 D. 139 cm 3 8) In the periodic table, the elements are arranged in: E. alphabetical order F. order of increasing atomic numbers G. order of increasing metallic properties H. order of increasing neutron content 9). The elements Ca, Ba, Be are:

7 A. halogens A. halogens B. alkaline-earth metals C. actinides D. alkali metals 10) The isotope 83 Kr contains: A. 83 protons and 36 neutrons B. 36 protons and 47 neutrons C. 36 protons and 83 neutrons D. 47 protons and 36 neutrons 11). How many electrons are in the cation Ba 2+? A. 20 B. 56 C. 137 D ) When potassium reacts with sulfur the compound formed is E. K 2 S 2 F. K 3 S 2 G. K 2 S H. KS 2 13) The name of the binary compound PO 3 is: E. phosphorous oxide F. phosphorous trioxide G. phosphorous(ii) oxide H. monophosphorous tetraoxide 14) What is the coefficient of H 2 when the following reaction is balanced? Ca(s) + H 2 O Ca(OH) 2 (aq) + H 2 (g)

8 E. 1 F. 2 G. 3 H. 4 15) Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? E. H, Li F. Ca, Sr G. Ga, Ge H. C, O 16) What is the mass % of sulfur in dimethylsulfoxide, C 2 H 6 SO? E. 59 F. 23 G. 41 H. 8 17). Vanadium exists in two isotopes: 50 V with atomic mass and 51 V with atomic mass Using this and information from the periodic table, determine the percent abundances of 50 V and 51 V A and B and C and D and ). Calculate the molecular weight (MW) of the molecule of Na 2 SO 4 : A. 142 B. 123 C. 101 D ) How many atoms of oxygen are in 10 g of NH 4 NO 3?

9 E. 346 F. 2.3x10 23 G. 1.5x10 23 H ) A mixture of 1 mole of C 2 H 4 and 5 moles of O 2 react to produce H 2 O and CO 2. Balance the reaction below and determine how many moles of the excess reactants will be left over when the reaction stops C 2 H 4 + O 2 CO 2 + H 2 O A. 2 moles of O 2 B. 2 moles of C 2 H 4 C. 4 moles of C 2 H 4 D. 1 mole of O 2