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Mid-Term Review 8th Grade Physical Science 2
Test Description: Use this to help you study for the Mid Term Exam.
Instructions: Answer all questions to get your test result.
1) Whole numbers that come before a substance in a chemical formula (such as 3CO or 4KCl) indicate
A
the order of the compounds in the formula
B
the number of atoms in the compound
C
the mass number of the compound
D
the number of molecules of the compound
2) How many centimeters are in a meter?
A
.01
B
100
C
10
D
1000
3) Which of the following can be separated into its components with a filter?
A
elements
B
suspensions
C
compounds
D
solutions
4) Which of these groups of letters could be used as a symbol for a single element?
A
fe
B
HF
C
Car
D
Cm
5) What is the main purpose of the scientific method?
A
To solve a problem or better understand an observation
B
To follow a set of rules so scientists do the same thing
C
To prove that the scientist's ideas are right
D
To make a scientific law
6) The distance between the Earth and the Sun is about 1.5 x 1011 m. In standard notation?
A
150,000,000,000
B
-150,000,000
C
0.000000000150
D
150,000,000
7) If you measured 2,300 grams, how many kilograms did you measure?
A
2.3 kg
B
230 kg
C
.23 kg
D
23 kg
8) Combining 2.5kg of A with 1.5kg of B creates new substances with different properties.
A
The mass of material created depends on the compounds used.
B
Mass of new substances equals mass of original materials.
C
This will release heat when it occurs.
D
Only new compounds will result, not single elements.
9) Which of the following is not a physical property?
A
density
B
boiling point
C
conductivity
D
flammability
10) Atoms of elements whose atomic mass is shown as a decimal in the periodic table
A
have different numbers of electrons
B
have different isotopes
C
have different numbers of protons
D
are counting the mass of electrons
*select an answer for all questions
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