We use cookies to ensure that we give you the best experience on our website. We adhere to the GDPR and EU laws and we will not share your personal information with or sell it to third-party marketers. If you continue to use this site we will assume that you are happy with it. Our privacy policy
Sub Topic: 2-5-simple-molecules-and-covalent-bonds
Syllabus Objectives
Core :
State that a covalent bond is formed when a pair of electrons is shared between two atoms leading to noble gas electronic configurations
Describe the formation of covalent bonds in simple molecules, including H2, Cl 2, H2O, CH4, NH3 and HCl.
Use dot-and-cross diagrams to show the electronic configurations in these and similar molecules
Describe in terms of structure and bonding the properties of simple molecular compounds:
a) low melting points and boiling points
b) poor electrical conductivity
EXTENDED/SUPPLEMENT
Describe the formation of covalent bonds in simple molecules, including CH3OH, C2H4, O2, CO2 and N2.
Use dot-and-cross diagrams to show the electronic configurations in these and similar molecules
Explain in terms of structure and bonding the properties of simple molecular compounds:
(a) low melting points and boiling points in terms of weak intermolecular forces (specific types of intermolecular forces are not required)
(b) poor electrical conductivity
Video Lectures
The above video is a preview of the actual revision notes available as a part of the paid membership for IGCSE CHemistry . All learning resources in the form of pdfs that are available on the website are 100% printable and downloadable.
Topic: Simple Molecules and Covalent Bonds / Test your Understanding
Click the highlighted blanks to reveal the correct answer.
1. A covalent bond is formed when a pair of
________________electrons
is shared between two
________________atoms
.
2. Covalent bonding helps atoms achieve
________________noble gas
electronic configurations.
4. Dot-and-cross diagrams are used to show
________________electronic configurations
in molecules.
5. In simple molecular compounds, melting points and boiling points are usually
________________low
.
6. Simple molecular compounds have poor electrical
________________conductivity
.
8. The low melting and boiling points of simple molecular compounds are due to weak
________________intermolecular forces
.
9. Specific types of intermolecular forces are
________________not required
at this level.
10. In H2, two hydrogen atoms share
________________one pair of electrons
.
11. In Cl2, each chlorine atom shares
________________one electron
to form a single covalent bond.
12. In water, oxygen forms
________________two
covalent bonds with hydrogen atoms.
13. In methane, carbon forms
________________four
covalent bonds.
14. In ammonia, nitrogen forms
________________three
covalent bonds with hydrogen atoms.
15. In hydrogen chloride, hydrogen and chlorine share
________________one pair of electrons
.
16. Simple molecular compounds conduct electricity poorly because they do not contain
________________free ions or electrons
.
17. Covalent bonds are usually formed between
________________non-metal
atoms.
18. O2 contains a
________________double bond
between the two oxygen atoms.
19. N2 contains a
________________triple bond
between the two nitrogen atoms.
20. CO2 contains
________________two double bonds
between carbon and oxygen atoms.
21. C2H4 contains a
________________double bond
between the two carbon atoms.
22. CH3OH is the formula for
________________methanol
.
23. The properties of simple molecular compounds can be explained by their
________________structure and bonding
.
Members Area
Unlock the complete range of solved past exam papers along with mock exams, revision notes, timed quizzes, interactive flipbooks and many more exam preparation resources.
Write a public review