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Worksheets8th grade science STAAR review 1
Total questions: 17
Worksheet time: 13mins
Name
Class
Date
1.
What element is represented in this Bohr Model?
a)
Carbon
b)
Hydrogen
c)
Aluminum
d)
Lithium
2.
Which is an electron?
a)
A
b)
B
c)
C
3.
What is the atomic number?
a)
The number of protons in an element
b)
The number of neutrons in an element
c)
The number of protons and neutrons.
d)
The number of protons and electrons.
4.
What is found in the nucleus of atoms?
a)
Protons and electrons.
b)
Protons, neutrons, and electrons.
c)
Protons and neutrons.
d)
Neutrons and electrons.
5.
How many valence electrons does Sodium (Na) have?
a)
1
b)
2
c)
3
d)
4
6.
Each row in the periodic table is called a
a)
group
b)
period
c)
cluster
d)
unit
7.
Each column in the periodic table is called a
a)
period
b)
group
c)
cluster
d)
unit
8.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
9.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
10.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
11.
Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
12.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
13.
Is C2H12O3 an organic or Inorganic Compound?
a)
Inorganic
b)
Organic
14.
Al2
a)
Element
b)
Molecule
c)
Compound
15.
Where are the most nonmetals located on the periodic table?
a)
In the bottom row
b)
On the left side and in the middle
c)
On the right side
d)
In the top row
16.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
17.
Which box has a higher density?
a)
Box A
b)
Box B
c)
cannot be determined
d)
they are the same
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