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8th Grade Chemical Bonding And Reactions 2
Test Description: Use this to help you with the information on the chemical bonding and reactions test.
Instructions: Answer all questions to get your test result.
1) An atom of an element becomes a negative ion when
A
it loses an electron from its valence level
B
it shares electrons with another atom
C
it gains an electron in its valence level
D
it loses a proton from its nucleus.
2) An atom of an element is positive when
A
it gains an electron in its valence level
B
it loses an electron from its valence level
C
it shares electrons with another atom
D
it loses a proton from its nucleus.
3) Which one of the following elements is the most stable element?
A
Fluorine
B
Potassium
C
Sodium
D
Argon
4) When an ionic bond is formed, what is the shape of the new compound?
A
round
B
no definite shape
C
cube
D
oval
5) In the chemical equation, 2H2 + O2 yields 2H2O, what is the number of oxygen molecules?
A
4
B
0
C
1
D
2
6) What does the coefficient of a compound in a chemical equation tell you?
A
It tells you the number to divide the compound by.
B
It telss you the number to mulitply the compound by.
C
It tells you the number of molecules of that compound that are formed.
D
It tells you the number of atoms of that compound this are formed.
7) Which side of the following chemical equation is the product side: 2H2 + O2 yields 2H2O?
A
There is no product.
B
Right side
C
Left side
D
This is not a chemical equation.
8) What holds the positive and negative ions together in an ionic bond?
A
Since opposite charges are attracted to each other, the ions arrange themselves next to an oppositely charged ion.
B
There is no such thing as an ionic bond.
C
The positive and negative ions are not produced in an ionic bond.
D
Since opposite charges repel each other, ionic bonds do not last long.
9) How do covalent bonds form?
A
Covalent bonds form when the atoms of the two different elements repel each other.
B
Covalent bonds form when the atoms of one element loses or gains an electron, forming a positive or negative ion.
C
Covalent bonds form when electrons are shared on the valence level between the atoms of two different elements.
D
Covalent bonds form when the temperature drops and the elements freeze.
10) Is this chemica equation balanced? CO2 + H2O yields C6H2O6 + O2
A
No, it is NOT balanced
B
Yes, it is balanced.
*select an answer for all questions
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