Everything Science Grade 11

1.11 CHAPTER 1. ATOMICCOMBINATIONS

(b) A type of chemical bond that involves the transfer of electrons from one atom to

another.

(c) A measure of an atom’s ability to attract electrons to it.

2. Which ONE of the following best describes the bond formed betweenan H+ion and
   the NH 3 molecule?
   (a) Covalent bond
   (b) Dative covalent (coordinate covalent) bond
   (c) Ionic Bond
   (d) Hydrogen Bond


3. Explain the meaningof each of the followingterms:
   (a) valency
   (b) bond energy
   (c) covalent bond


4. Which of the following reactions will not take place? Explain your answer.
   (a) H + H→ H 2
   (b) Ne + Ne→ Ne 2
   (c) Cl + Cl→ Cl 2


5. Draw the Lewis structure for each of the following:
   (a) calcium
   (b) iodine (Hint: Whichgroup is it in? It will besimilar to others in thatgroup)
   (c) hydrogen bromide (HBr)
   (d) nitrogen dioxide (NO 2 )


6. Given the followingLewis structure, whereX and Y each representa different ele-
   ment:

X Y X

X

ו

ו××

ו

(a) What is the valencyof X?

(b) What is the valencyof Y?

(c) Which elements could X and Y represent?

7. A molecule of ethane has the formula C 2 H 6. Which of the following diagrams
   (Couper notation) accurately represents this molecule?

CH

H

H

C

H

H

H

(a)

CH

H

H

C

H

H

(b)

CH

H

H

C

H

H

(c) H

8. Potassium dichromate is dissolved in water.