Download 2.4 Revision 1: There were two atoms. One got hit by an extremely

2.4 Revision 1:
There were two atoms. One got hit by an extremely electronegative fluorine atom.
“Help, I’ve lost an electron”, it cried. “Are you sure?” said the other. “_ _ _ _ _ _ _ _
_ _” it replied.
Solve the problems to find the punch line for the joke.
1.
2.
3.
4.
5.
6.
7.
8.
How many valence electron in a molecule of H2O? ……………..
What shape is a molecule of methane? …………………………...
What shape is a molecule of CO2? …………………………
What shape is a molecule of NCl3? ………………………..
What shape is a molecule of AlBr3? ………………………
How many valence electrons in the outer shell of an O2- ion?…………..
Which of these molecules is polar; C2H4, CH3OH, CCl4? …………
How many neutrons in the nucleus of an atom with atomic number 7 and
atomic mass 15? ……….
9. Which is the most electronegative; S, N, H, C? ……………..
10. Which atom is the smallest; Na, Al, P, Cl? ……………..
Answers:
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
F
H
9
5
Cl
S
C
Na
8
Al
H
P
Tetrahedral
Cu
Triangular
pyramid
Linear
C2H4
P
Flat triangle
CH3OH
CCl4
N
Square
12
Types of Solid
1. What type of solid:
a. Has the highest melting point?
b. Has the lowest melting point?
c. Conducts electricity when solid and melted?
d. Conducts electricity when dissolved or melted but not as a solid?
e. Forces that hold non-polar molecular solids together.
f. Can conduct heat and electrical charge.
g. Which of the following solids have hydrogen bonds between
molecules; hydrogen chloride, calcium, sodium chloride, ammonia,
graphite.
h. The reason that metals can conduct electricity, heat and can be bent.
Little Willie was a chemist.
Little Willie is no more.
For what he thought was H2O
--- ----Answers
A
B
C
D
E
F
G
H
I
J
K
graphit
e
atoms
Sodium
chloride
Permanen
t dipoles
chlorine
silica
ionic
hydrogen
Halide
s
calciu
m
L
M
N
O
P
Q
R
S
T
U
V
Hydroge
chloride
Positiv
e ions
carbo
n
Ammoni
a
Valence
electrons
Covalent
bonds
Boro
n
Metal
Hydroge
n bonds
Layers
of
atoms
Vapour
molecula
r
W
X
Y
Z
1
2
3
4
5
6
7
Giant
molecula
r
Force
zone
triple
magnetic
distance
Temporar
y dipoles
Tripl
e
bond
Delocalise
d electrons
Willie
Ionic
bonds
big