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.
It costs only $12.50 per month to play this quiz and over 3,500 others that help you with your school work. You can subscribe on the page at Join Us
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).
[readmore]
When elements react, atoms of each element join with atoms of other elements to form compounds. The atoms are held together by chemical bonds which can be either ionic or covalent. This quiz is all about covalent bonding. The three covalently bonded compounds that you need to know about in order to pass your exams are water, carbon dioxide and chlorine gas.
When covalent chemical bonding occurs, atoms of the elements involved share electrons. Electrons are shared in pairs and atoms can share more than one pair of electrons. When an atom has shared the exact number of electrons it requires, it will not be able to share with any other atoms. No electrons are lost or gained therefore covalent compounds do not contain ions, they are made up from molecules. This is very different to ionic compounds which are giant structures of ions.
Some molecules are very simple and consist of only two atoms, like the oxygen that we breathe. Others are incredibly large and complex for example, a single strand of human DNA is made up from around 200 billion atoms, all covalently bonded.
It is essential for the exam that you know the about atoms, molecules, elements and compounds. A lot of students are not sure how these are all related.
- All matter is made from atoms
- Molecules are made from covalently bonded atoms of non-metals
- Non-metal elements are usually made from molecules
- Metal elements are always made up from atoms, never molecules
- Compounds are made from different atoms joined together
- Compounds made from non-metal atoms joined together are always made of covalent molecules
Have a go at this quiz and see how well you understand covalent bonding.
[/readmore]
|
1.
|
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 |
|
|
|
2.
|
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 |
|
|
|
3.
|
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 |
|
|
|
4.
|
Which of the following could have covalent bonding? |
|
| [ ] |
An alloy |
| [ ] |
Atoms of a metal |
| [ ] |
Atoms of a non-metal |
| [ ] |
Molecules of a non-metal |
|
|
|
5.
|
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 |
|
|
|
6.
|
Which of the following represents a molecule of carbon dioxide? |
|
| [ ] |
O=O=C |
| [ ] |
C=O=O |
| [ ] |
O=C=O |
| [ ] |
C=O=C |
|
|
|
7.
|
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 |
|
|
|
8.
|
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? |
|
| [ ] |
One |
| [ ] |
Two |
| [ ] |
Three |
| [ ] |
Seven |
|
|
|
9.
|
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 |
|
|
|
10.
|
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 |
|
|
|
1.
|
Which of the following is not true about the compound carbon disulfide? |
|
| [ ] |
It is made from molecules |
| [x] |
It is ionically bonded |
| [ ] |
It is covalently bonded |
| [ ] |
There are twice as many sulfur atoms as carbon atoms |
|
|
|
2.
|
What is a single covalent bond? |
|
| [x] |
One pair of shared electrons |
| [ ] |
Two pairs of shared electrons |
| [ ] |
One electron shared between two atoms |
| [ ] |
Four electrons shared between two atoms |
|
|
|
3.
|
Which of the following would have covalent bonding? |
|
| [ ] |
A compound made from metals |
| [x] |
A compound made from non-metals |
| [ ] |
An element made from metals |
| [ ] |
None of the above |
|
|
|
4.
|
Which of the following could have covalent bonding? |
|
| [ ] |
An alloy |
| [ ] |
Atoms of a metal |
| [ ] |
Atoms of a non-metal |
| [x] |
Molecules of a non-metal |
|
|
|
5.
|
How is a single covalent bond conveniently represented? |
|
| [ ] |
Two dots side by side |
| [x] |
A short horizontal line between the symbols of the elements involved |
| [ ] |
A dot followed by a dash followed by a dot |
| [ ] |
A semi colon |
|
|
|
6.
|
Which of the following represents a molecule of carbon dioxide? |
|
| [ ] |
O=O=C |
| [ ] |
C=O=O |
| [x] |
O=C=O |
| [ ] |
C=O=C |
|
|
|
7.
|
Why is the bonding in chlorine gas covalent? |
|
| [ ] |
Chlorine gas is made from molecules |
| [ ] |
Chlorine is an element |
| [ ] |
Chlorine is a halogen |
| [x] |
Chlorine is a non-metal |
|
|
|
8.
|
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? |
|
| [x] |
One |
| [ ] |
Two |
| [ ] |
Three |
| [ ] |
Seven |
|
|
|
9.
|
Is salt covalently bonded? |
|
| [ ] |
Yes, because it is made from crystals |
| [ ] |
Yes, because it dissolves in water |
| [x] |
No, because it is made from a metal joined to a non-metal |
| [ ] |
No, because it can be obtained from the ground |
|
|
|
10.
|
Which of the following word equations correctly represents a reaction in which covalent bonding occurs? |
|
| [x] |
Hydrogen + oxygen → water |
| [ ] |
Carbon + dioxide → carbon dioxide |
| [ ] |
Sulfuric acid + zinc → hydrogen + zinc sulfate |
| [ ] |
Chlorine + chlorine → dichlorine |
|
|
