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WorksheetsUnit 3 Test Review
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
Elements are composed of atoms of at least two different types.
a)
True
b)
False
2.
Use the periodic table to find the atomic number for lithium (Li).
a)
3
b)
7
c)
10
3.
How many electrons are in one neutral atom of Barium (Ba)?
a)
56
b)
101
c)
137
4.
How many valence electrons are in a neutral atom of Magnesium (Mg)?
a)
2
b)
3
c)
12
5.
Which element is a metal?
a)
Li
b)
P
c)
Ar
6.
Which element is a non-metal?
a)
K
b)
Nb
c)
O
7.
Which element will not react with other elements?
a)
Be
b)
Fe
c)
Ne
8.
A metal and a non-metal typically form covalent compounds.
a)
True
b)
False
9.
A diatomic molecule of nitrogen (N) would be held by covalent bonds.
Hint: A covalent bond can also develop between two atoms of the same kind. When this happens, the result is called a diatomic molecule. In nature hydrogen gas exists as H2, meaning that it is found as one hydrogen atom covalently bonded to another hydrogen atom.
Hint: A covalent bond can also develop between two atoms of the same kind. When this happens, the result is called a diatomic molecule. In nature hydrogen gas exists as H2, meaning that it is found as one hydrogen atom covalently bonded to another hydrogen atom.
a)
True
b)
False
10.
During the formation of an ionic bonds, electrons are transferred from one atom to another.
a)
True
b)
False
11.
A covalent bond is formed when atoms share electrons.
a)
True
b)
False
12.
A cation is an atom that has gained electrons.
a)
True
b)
False
13.
A anion is an atom that has lost electrons.
a)
True
b)
False
14.
Organic compounds are important to all living things.
Hint: Organic compounds are a type of covalent compound that contain the element carbon. Organic compounds are the stuff of life. Every living thing depends on them.
Hint: Organic compounds are a type of covalent compound that contain the element carbon. Organic compounds are the stuff of life. Every living thing depends on them.
a)
True
b)
False
15.
Which of the following is an example of a mixture?
Hint: Mixture-two or more kinds of matter put together. A mixture is a substance that can be formed by combining two or more different substances together without those substances bonding together. Mixtures can be physically separated.
Hint: Mixture-two or more kinds of matter put together. A mixture is a substance that can be formed by combining two or more different substances together without those substances bonding together. Mixtures can be physically separated.
a)
Salt Water
b)
Salt
c)
Water
16.
Which of the following is an example of a heterogeneous mixture?
a)
Bronze
b)
Saltwater
c)
Salad
17.
In a solution, the solute is the substance that is dissolved.
a)
True
b)
False
18.
In a solution, the solvent is the substance that dissolves another substance.
a)
True
b)
False
19.
Solubility refers to a substance’s ability to break apart water molecules.
a)
True
b)
False
20.
A molecule of water is polar, meaning that it has an area of slight negative charge and an area of slight positive charge.
Hint: Solute particles are separated from each other and are surrounded by solvent particles. a. Water is polar and easily dissolves ionic compounds i.e. NaCl b. Water is polar because it is slightly positive and slightly negative
Hint: Solute particles are separated from each other and are surrounded by solvent particles. a. Water is polar and easily dissolves ionic compounds i.e. NaCl b. Water is polar because it is slightly positive and slightly negative
a)
True
b)
False
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