Biology 11 Chapter 2
Biological Molecules - 10
1.
A polar covalent bond is a chemical bond in which shared electrons are pulled closer to the more electronegative atom, making it?
a) Partially negative and the other atom partially positive
b) Partially positive and the other atom partially negative
c) Completely negative and the other atom completely positive
d) Two answers are correct
2.
H
2
O as a whole is?
a) Negative
b) Positive
c) No answer is correct
d) Neutral
3.
Because of its polar covalent bonds, water is a?
a) Non polar molecule
b) Neutral molecule
c) Polar molecule
d) Negative molecule
4.
water is a polar molecule means?
a) it has a slightly negative pole and two slightly positive ones.
b) it has two slightly negative pole and one slightly positive ones.
c) it has a slightly negative pole and two tightly positive ones.
d) it has a slightly positive pole and two slightly negative ones.
5.
When hydrogen gas combines with oxygen gas to form water, is the hydrogen reduced or oxidized?
a) The hydrogen molecules are reduced.
b) The hydrogen molecules are oxidized and the oxygen atoms are reduced.
c) Two answers are correct
d) Oxygen atoms are oxidized.
6.
The polarity of water molecules makes them ________ with each other?
a) React
b) Change
c) Interact
d) Oxidise
7.
In water molecules the charged regions on each molecule are attracted to oppositely charged regions on neighbouring molecules, forming?
a) Strong bonds
b) Strong ions
c) Weak ions
d) Weak bonds
8.
In water molecules since the positively charged region in this special type of bond is always ______, the bond is called a ________?
a) An H atom, hydrogen bond
b) A positively charged atom
c) A negatively charged atom
d) A O atom, Oxygen bond
9.
In water molecules hydrogen bond is often represented by a dotted line because a hydrogen bond is?
a) Hard to break
b) Two answers are correct
c) Easily broken
d) Strong
10.
Because of hydrogen bonding, water is a liquid at temperatures suitable for life. It boils at _______ and freezes at ______?
a) 100
o
C, 5
o
C
b) 98
o
C, 0
o
C
c) 99
o
C, -5
o
C
d) 100
o
C, 0
o
C
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