chem 6a fall 2009 practice test with key

chem 6a fall 2009 practice test with key -...

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Chemistry 6A: Midterm Review “Pop Quiz” 1) How many electrons can have the following quantum numbers: ( 3, 1, ‐1) 2 electrons (with + ½ and – ½ spin quantum numbers) 2) Write the electron configuration for Ag+ (with and without the abbreviation). 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 8 or [Kr] 5s 2 4d 8 3) Draw the orbital diagram for ground state oxygen. 2p 2s 1s 4) How many nitrogen atoms are there in 5.36g of Ba(NO 3 ) 2 ? Molar Mass of Ba(NO 3 ) 2 : 1 (Ba) + 2 (N) + 6 (O) (137.3 g/mol) + 2 (14.01 g/mol) + 6 (16.00 g/mol)= 261.32 g/mol Moles of Ba(NO 3 ) 2 : 5.36 g Ba(NO 3 ) 2 ÷ (261.32 g/mol) = 0.0205 mol Ba(NO 3 ) 2 (0.0205 mol Ba(NO 3 ) 2 )(2 moles N)(6.02214 x 10 23 mol ‐1 ) = 2.47 x 10 22 atoms N 5) Arrange the following (Sr, Mg, Mg 2+ ) in order of increasing: a) Radius: b) Ionization Energy: Mg 2+ < Mg < Sr Sr < Mg < Mg 2+ 6) Why is the 2 nd ionization energy so much higher than the 1 st ? After you pull off the first electron, the remaining electrons feel a stronger pull from the positive nucleus
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