Exam3F10 - Exam 3 Principles of Chemistry 4:011 November...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Exam 3 Principles of Chemistry 4:011 November 18, 2010 Name ________________________________ ________________________________________________________________________________ h = 6.626 x 10 -34 J . s c = 3.00 x 10 8 m/s ________________________________________________________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. ________________________________________________________________________________ 1) From the bond enthalpies, estimate the Δ H rxn for forming 2 moles of ammonia gas (NH 3 ) from nitrogen and hydrogen gas: Bond Bond Energy (kJ) N-H 391 H-H 436 N=N 418 N N 941 A) 204 kJ B) -319 kJ C) -97 kJ D) -620 kJ E) 1076 kJ 2) Which of the following is incorrect about the nitryl chloride (NO 2 Cl) molecule? A) The electron domain geometry is trigonal planar. B) The nitrogen has a formal charge of zero. C) The molecule has a resonance structure. D) The molecular geometry is trigonal planar. E) The central atom is nitrogen. 3) Based on molecular orbital theory, there are ______ unpaired electrons in the O 2 + ion. A) 2 B) 1 C) 1/2 D) 0 E) 3 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4) Which one of the following choices gives the bond order for NO (nitric oxide) that would be predicted by molecular orbital theory? A) 2B ) 1C ) 3D ) 2.5 E) 1.5 5) What is the molecular geometry of the nitrite anion (NO 2 - ), as predicted by the VSEPR model? A) bent B) trigonal planar C) tetrahedral D) linear E) None of these geometries is correct. 6) Draw the Lewis structure of PO 3 - including any valid resonance structures. Which of the following statements is TRUE ? A) The PO 3 - ion contains two P-O single bonds and one P-O triple bond. B) The PO 3 - ion contains one P-O single bond and two P-O double bonds. C) The PO 3 - ion contains three P-O double bonds. D) The PO 3 - ion contains two P-O single bonds and one P-O double bond. E) The PO 3 - ion contains three identical P-O bonds with bond order of 1.66. 2
Background image of page 2
7) In each of three experiments, a beaker filled with 15 mL of water and a drop of pH indicator was placed in a bell jar and evacuated with a vacuum pump. Once the water bubbled, the bell jar was closed off to the pump and the initial pressure recorded. Then 30 mL of an unknown gas (each gas at 760 mm Hg in a syringe) was injected into the bell jar and allowed to equilibrate for 10 minutes so that the final pressure would no longer change.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

Exam3F10 - Exam 3 Principles of Chemistry 4:011 November...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online