exam2so9(11111)

exam2so9(11111) - Question 1 Consider the molecule HNO2...

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

View Full Document Right Arrow Icon
Question 1 Consider the molecule HNO 2 (nitrous acid) Which of the following Lewis structures is the correct one? ER = 2 +3*8= 26 VE= 1+5+2*6=18 TP=9 shared 8 SP=4 LP= 9-4=5 The latter eliminates B. The C and D structures get awkward formal charges. A is correct: no formal charges H O N O A H O O B H O O N C H O N D E : none of the above Question 2 Consider the molecule hydrazine N 2 H 4 Select the correct statement A. There is a single bond between the two N-atoms, they each have a lone pair and the H- N-H angle is about 109 o . B. There is a double bond between the N-atoms and the H-N-H bond angle is about 120 o . C. The hybridization on the N-atoms is sp 3 and their oxidation number is -2 D. A + C are true
Background image of page 1

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

View Full DocumentRight Arrow Icon
E. B + C are true Correct answer is D. Partial credit for either A or C Question 3 Consider the molecule HCN Select the correct statement A. The H-C-N bond angle is 180 o . B. There is a double bond between C and N-atoms and the H-C-N bond angle is about 120 o . C. The formal charge on the C-atom is zero, but its oxidation number is +2 D. A + C are true E. B + C are true D is the correct answer. Partial credit for either A or C Question 4 Consider the compound Hg 2 Cl 2 Select the correct answer A. Its name is antimony(I) dichloride and it is a covalent compound B. Its name is mercury(I) chloride and it is a polar covalent compound. C. Its name is gadolinium dichlorate and it is an ionic compound D. Its name is mercury dichloride and it is an ionic compound E. None of the above Question 5 Consider the compound potassium sulfite Select the correct answer A. It is an ionic compound with the formula Pt 2 SO 3 B. It is a covalent compound with the formula K 2 S
Background image of page 2
C. It is an ionic compound with the formula K 2 SO 4 D. It is an ionic compound with the formula K 2 SO 3 E. It is a polar compound with the formula Na 2 SO 3 Question 6 Consider the compounds scandium oxide, barium oxide and cesium oxide. What are the correct chemical formulas?
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

exam2so9(11111) - Question 1 Consider the molecule HNO2...

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