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AlsupChem 1st Sem Rev PT2
Test Description: Review of 1st semester
Instructions: Answer all questions to get your test result.
1) What is one difference between a mixture and a compound?
A
A compound consists of more than one phase
B
A mixture can only be seperated into its components by chemical means
C
A mixture must be uniform in composition
D
A compound can only be seperated itno its componenets by chemical means
2) The first figure in a properly written chemical symbol always is _
A
italicized
B
capitalized
C
underlined
D
boldfaced
3) Which of the following represents a compound?
A
H2O
B
H-3
C
O-14
D
H
4) What must be done to be certain that a chemical change has taken place?
A
check the composition of sample before and after change
B
check for bubbles
C
demonstrate energy is absorbed
D
demonstrate the release of heat
5) The diameter of a carbon atom is 0.000 000 000 154 m . What is the number in scientific notation?
A
1.54 x 10 10
B
1.54 x 10 -10
C
1.54 x 10 - 12
D
1.54 x 10 12
6) How man significan figures are in the measurement 40,500 mg
A
8
B
2
C
5
D
3
7) What is the temperature of absoluted zero measured in C
A
-73
B
-373
C
-273
D
-173
8) What is the boiling point of water in kelvins?
A
273 K
B
373 K
C
100 K
D
0K
9) The atomic number of an element is the total number of which particles in the nucleus?
A
protons
B
electrons
C
protons and electrons
D
neutrons
10) Isotopes of the same element have different_________
A
chemical behavior
B
atomic numbers
C
mass numbers
D
positions on the periodic table
*select an answer for all questions
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