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Chemistry - Covalent Bonding
Water is one of the three covalently bonded compounds that you need to know about, along with carbon dioxide and chlorine gas.

Chemistry - Covalent Bonding

This Chemistry quiz is called 'Chemistry - Covalent Bonding' and it has been written by teachers to help you if you are studying the subject at high school. Playing educational quizzes is a user-friendly way to learn if you are in the 9th or 10th grade - aged 14 to 16.

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To do well in high school Science, students should have a good understanding of the fundamental ideas in chemistry. This is the fourth of six quizzes aimed at reinforcing these ideas and it focusses on covalent bonding of atoms in compounds (molecules).

What is a single covalent bond?
One pair of shared electrons
Two pairs of shared electrons
One electron shared between two atoms
Four electrons shared between two atoms
The second option describes a double covalent bond
Chlorine has seven electrons in its outer energy level (shell). Six of these are arranged in pairs with one on its own. How many covalent bonds can it form?
Only electrons that are not already part of a pair can be shared
How is a single covalent bond conveniently represented?
Two dots side by side
A short horizontal line between the symbols of the elements involved
A dot followed by a dash followed by a dot
A semi colon
A double covalent bond looks like an equals sign and a triple covalent bond is like an equals sign with an extra line underneath (or above!) it
Which of the following is not true about the compound carbon disulfide?
It is made from molecules
It is ionically bonded
It is covalently bonded
There are twice as many sulfur atoms as carbon atoms
You may never have heard of this compound but that doesn't matter. The name tells you enough to answer the question
Which of the following word equations correctly represents a reaction in which covalent bonding occurs?
Hydrogen + oxygen → water
Carbon + dioxide → carbon dioxide
Sulfuric acid + zinc → hydrogen + zinc sulfate
Chlorine + chlorine → dichlorine
Only the first and the third word equations are correct and since the third one involves a metal, it must have ionic bonding
Which of the following represents a molecule of carbon dioxide?
Carbon dioxide is a linear molecule - all 3 atoms are in a line, with carbon in the middle
Which of the following could have covalent bonding?
An alloy
Atoms of a metal
Atoms of a non-metal
Molecules of a non-metal
Only molecules have covalent bonding which immediately rules out the other answers
Is salt covalently bonded?
Yes, because it is made from crystals
Yes, because it dissolves in water
No, because it is made from a metal joined to a non-metal
No, because it can be obtained from the ground
To answer correctly without guessing you need to know that salt is sodium chloride. Sodium is a metal so it can't possibly be covalently bonded
Why is the bonding in chlorine gas covalent?
Chlorine gas is made from molecules
Chlorine is an element
Chlorine is a halogen
Chlorine is a non-metal
All of the statements about chlorine are true. You may have chosen option 1 as you know molecules are always covalently bonded but that doesn't answer the question. The only option that answers 'why' is the fact that it is a non-metal
Which of the following would have covalent bonding?
A compound made from metals
A compound made from non-metals
An element made from metals
None of the above
Compounds of non-metals are always covalently bonded
Author:  Kev Woodward

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