2) Calculate 2.46 mg = A) g B) 2460 g C) g D) g. 3) Calculate 2.46 kg = A) g B) g C) 2460 g D) 0.

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1 Spring 2015 Chem2A Test 1 Name Score /150 MULTIPLE CHOICE. 3 pts each 1) Which one of the following illustrations best represents a pure compound? 1) A) B) C) D) 2) Calculate 2.46 mg = A) g B) 2460 g C) g D) g 2) 3) Calculate 2.46 kg = A) g B) g C) 2460 g D) g 3) 4) Solve with proper number of significant figure for = A) B) C) 14 D) ) 5) How many significant figures should be included in the answer to the following calculation? A) 3 B) 1 C) 2 D) 4 5) 6) The approximate radius of gold atom is m, expressed in proper scientific notation the number as A) m B) m C) m D) m 6) 7) The average distance between the Sun and the Earth is 149,600,000,000 m, expressed in proper scientific notation the number as A) m B) m C) m D) m 7) 8) In the experiment to determine the density of an unknown liquid, the volume and the mass of the liquid were 9.89 ml and 8.75 g. The density of the liquid is A) 1.13 g/ml B) not enough information C) 8.65 g/ml D) g/ml 8) 9) One summer afternoon the temperature at Fullerton, California, reached 102 F. It equals A) 84 C B) 39 C C) 102 C D) 39 K 9) A 1

2 10) What is the volume, in milliliters, of 50.0 g of a liquid if its density is 1.20 g/ml? A) 75.0 ml B) 41.7 ml C) 60.0 ml D) 32.1 ml 10) 11) What is the mass, in grams, of 30.0 ml of a liquid if its density is 1.20 g/ml? A) 30.0 g B) 36.0 g C) 36 g D) 1.20 g 11) 12) Which element is most similar to Carbon? A) Arsenic B) Silicon C) Nitrogen D) Sulfur 12) 13) Neutral atoms of isotopes of an element must have different A) Number of electrons B) Atomic numbers C) Number of protons D) Number of neutrons 13) 14) The numbers of protons and neutrons in an atom of U are A) 92, 143 B) 92, 238 C) 238, 92 D) 92, ) Which one of the following shells has the lowest energy? A) 3 B) 2 C) 4 D) 1 14) 15) 16) Which one of the following subshells has the highest energy? A) 2p B) 2s C) 4f D) 1s E) 3d 16) 17) The correct electron configuration for the phosphorus atom is A) 1s22s22p63p5 B) 1s22s22p63s3 C) 1s22s22p5 D) 1s22s22p63s23p3 18) Which sublevel will contain electrons with the lowest energy? A) 3d B) 3p C) 4s D) 3s 17) 18) 19) What is the maximum number of electrons that can occupy the 4f sublevel? A) 14 B) 6 C) 8 D) 10 19) 20) The number of orbitals exist in the third principal energy level is A) 6 B) 9 C) 3 D) 4 20) 21) The correct orbital diagram for an oxygen atom at its ground state is A) B) C) 3s D) 21) 22) Classify the element with the electron configuration [Ne]3s23p6 A) Alkaline earth metal B) Halogen C) Noble gas D) Alkali metal 22) 23) Which of the following shows the correct order of atomic radii from small to large? A) Li, C, O, Na B) O, C, Li, Na, C) Na, Li, C, O D) Na, O, C, Li 23) A 2

3 24) Which one of the following electron configurations presents 3 valence electrons? A) 1s22s22p63s23p64s23d104p3 B) 1s22s22p63s23p64s23d104p1 C) 1s22s22p63s23p64s23d3 D) 1s22s22p63s23p64s23d104p3 25) Which of the following elements shows the strongest metallic characteristics? A) Ca B) Mg C) Si D) K 24) 25) 26) Ionization energy is the energy required to remove an electron from an atom. Which of the following atoms has the highest ionization energy? A) Na B) Ca C) Mg D) Be 26) 27) Which one of the following illustration represents a d orbital 27) A) B) C) D) 28) Which of the following is NOT an ionic compound? A) NiCl3 B) NCl3 C) NaCl D) NdCl3 28) 29) What is the formula of iron(iii) nitrate? A) Fe(NO2)3 B) Fe(NO3)2 C) Fe3NO3 D) Fe(NO3)3 29) 30) The name of compound FePO4? A) iron phosphate B) iron(ii) phosphate C) iron(iii) phosphate D) iron phosphide 31) What is the formula of sodium phosphate? A) NaPO B) NaPO4 C) Na3PO4 D) Na3P 30) 31) 32) What is the formula of calcium nitride? A) Ca(NO3)2 B) Ca3N2 C) CaNO3 D) CaN 32) PROBLEMS. Show work with proper Significant Figures and Units to receive credit. 10 pts for each question unless otherwise noted. 33) (6 pts) Write the electron configuration for a chlorine (example, 1s22s1) A 3

4 34) (18 pts) Write formula for the following compounds. Nickel(II) chloride iron(iii) sulfate copper(i) phosphate nitric acid potassium bicarbonate aluminum nitrate 35) (12 pts) Name the following compounds: ZnCO3 Mg(C2H3O2)2 Hg2S Mn3(PO 4 )2 36) (8 pts) Complete the following conversion: 1,680 m =? in 2.50 mg =? kg 37) (10 pts) Calculate the mass of gasoline, in grams, required to fill a 5.0-gal tank. (Density of gasoline = g/ml, 1 gal = 3.78 L) A 4

5 Answer Key Testname: 2A_S15_T1 1) B: A. Heterogeneous mixture; B. Pure compound; C. Element; D. Homogenous mixture (two elements) 2) C 3) C 4) D: keep ONE decimal place 5) C: = 5.78/ ) D 7) A 8) D: Density = mass/volume 9) B: Celsius = (F - 32)/1.8 (both 32 and 1.8 are exace numbers) 10) B: Volume = Mass/Density 11) B: Mass = Density x Volume 12) B: Elements in the same GROUP (column in the Periodic table) have similar chemical properties. 13) D 14) D: Mass number = #Proton + #Neutron, 238 = 92 + #Neutron 15) D 16) C: Use the Aufbau principle (the diagonally down moving order to fill subshells) 17) D 18) D 19) A: maximal #electrons : s (2), p (6), d(10), f(14) 20) B: there are 3s, 3p, and 3d subshells, so maximal #orbitals = = 9 21) A 22) C: #Valence electrons: Alkali metal (1), Alkaline earth (2), Halogen (7), Noble gas (8 except He). 23) B: In the periodic table, Atomic radius increase from top to bottom, decrease from Left to Right. 24) B: Only electrons in the HIGHEST SHELL are the valence electrons 25) D: In the periodic table, Metallic character increases from top to bottom, decreases from Left to Right. 26) D: Ionization energy follows the opposite trend to the metallic characters (see Question 25). 27) A 28) B: Ionic compound contains ions, either metal or NH4+ ion. 29) D 30) C: charge of iron is ) C: charge of sodium is +1 (ALWAYS) 32) B: remember ALL the charges of monatomic anions (nitride, oxide, sulfide, chloride, iodide, etc.) 33) 1s22s22p23s23p 5 34) Answers for the following questions see the exam. 35) 36) 37) A 5