Chemistry

Question 1

1The shape of an ammonia molecule, NH₃, is

Medium

A. bent B. trigonal planar C. tetrahedral D. trigonal pyramidal

Question 2

2A water molecule is linear.

Easy

A. True B. False

Question 3

3The force between H₂O molecules that gives water its high boiling point is the hydrogen ___.

Easy

Your answer (fill in the blank)

Question 4

4Ice is less dense than liquid water because

Hard

A. water molecules shrink when cold B. ice contains air bubbles only C. ice is ionic D. hydrogen bonds hold molecules in an open lattice

Question 5

5Ammonia has ___ lone pair(s) of electrons on nitrogen.

Medium

Your answer (fill in the blank)

Question 6

6The shape of PCl₅ is

Hard

A. square planar B. octahedral C. trigonal bipyramidal D. tetrahedral

Question 7

7The shape of SF₆ is

Hard

A. square pyramidal B. tetrahedral C. octahedral D. trigonal bipyramidal

Question 8

8Lone pairs of electrons repel

Hard

A. equally with bonding pairs B. more strongly than bonding pairs C. less strongly than bonding pairs D. not at all

Question 9

9Carbon dioxide is non-polar even though its C=O bonds are polar because

Hard

A. carbon is a metal B. the molecule is linear and the dipoles cancel C. it is ionic D. it has lone pairs on carbon

Question 10

10The bond angle in water is about

Medium

A. 180° B. 104.5° C. 120° D. 109.5°