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Course: Cambridge AS & A Level Biology 9700 ...
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Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

0/26

2 · Biological Molecules

0/51

3 · Enzymes

0/29

4 · Cell Membranes and Transport

0/41

7 · Transport in Plants

0/28

8 · Transport in Mammals

0/39

10-11 · Infectious Disease and Immunity

0/43

12 · Energy and Respiration

0/37

13 · Photosynthesis

0/23

14-15 · Homeostasis and Control

0/57

16 · Inherited Change

0/33

17-18 · Selection, Evolution, Classification and Conservation

0/70

19 · Genetic Technology

0/44
Quiz

2.4.1 Water and the Hydrogen Bond – Exam questions

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1.

Hydrogen bonds in water form between

two hydrogen atoms
two oxygen atoms
carbon and hydrogen
the oxygen of one molecule and a hydrogen of another
2.
Water is polar because oxygen pulls shared electrons more strongly than hydrogen. True or false?
True
False
False, hydrogen pulls harder
True only in ice
3.
Which statement best describes Hydrogen bond?
Electrons shared between two atoms.
Electrons transferred; opposite charges attract.
Same element, different neutron number — same chemistry, different mass.
A weak attraction between a slightly positive H and a slightly negative atom nearby.
4.
Relative bond strengths are shown. About how many times stronger is a covalent bond than a hydrogen bond?
About 20 times
About 2 times
About 200 times
They are equal
5.
Which statement best describes Polar covalent bond?
Electrons transferred; opposite charges attract.
Shared unequally, so one end is slightly negative — as in water.
Electrons shared between two atoms.
A weak attraction between a slightly positive H and a slightly negative atom nearby.
6.
The O—H bond in water is polar because oxygen pulls shared electrons more strongly. True or false?
True
False
False, electrons are shared equally
True only in ice
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