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8th Grade 2nd 9weeks Exam Pt. 2
Test Description: 2nd 9weeks exam review
Instructions: Answer all questions to get your test result.
1) Angie is testing whether ammonia and vinegar are acids or bases. Litmus paper helps determine whether a chemical is an acid or a base. A drop of ammonia turns the litmus paper blue, and a drop of vinegar turns the litmus paper red. What can Angie
A
Both of the chemicals are bases.
B
Both of the chemicals are acids.
C
Ammonia is a base, and vinegar is an acid.
D
Ammonia is an acid, and vinegar is a base.
2) Police can detect speeding motorists with a radar gun. What property of waves enables them to do this?
A
Waves bend around barriers.
B
Waves bounce off when they strike an object.
C
Two waves combine, travel together, and form a new wave.
D
Waves bend when they strike an object.
3) The chemical formula for a compound that has one Calcium atom and 2 Chlroine atoms is _______.
A
CaCl2
B
CaCl
C
3CaCl
D
Ca2Cl
4) Which of the following correctly converts 0.23 kilograms (kg) into grams (g)?
A
0.023 g
B
0.0023 g
C
230 g
D
23 g
5) Which of the following is the structure of an atom most like?
A
a forest
B
a baseball field
C
the solar system
D
a factory
6) Which atomic particles will you find inside of the nucleus of an atom?
A
protons, electrons
B
neutrons, electrons
C
electrons only
D
protons, neutrons
7) If an element has an atomic number of 12, how many electrons does it have?
A
12
B
24
C
18
D
8
8) If an element has an atomic number of 22 and the atomic mass is 48 how many neutrons does it have?
A
26
B
22
C
70
D
48
9) Ex. A) A piece of paper is burned. Ex. B) A piece of paper is folded in half. Based on the information above, Scenario A is a __ change and Scenario B is a __ change.
A
physical, chemical
B
chemical, chemical
C
physical, physical
D
chemical, physical
10) WARNING: Goggles and Aprongs Must Be Worn at ALL Times. This sign was found at the entrance of a chemistry laboratory. It is an important sign because _____.
A
goggles help chemists see better
B
chemists will be fined if they do not obey the rules
C
accidents rarely happen in laboratories
D
chemicals can seriously damage eyes and skin
*select an answer for all questions
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