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Semester Review
Test Description: 1st semester
Instructions: Answer all questions to get your test result.
1) The safest way to dilute concentrated sulfuric acid is to add ---
A
the acid to water slowly while stirring
B
dilute the sulfuric acid to a small volume of the concentrated acid
C
the acid to a small volume of water and then add more water
D
a series of small volumes of water to the acid while stirring
2) Which of the following groups contains members with a similar chemical reactivity?
A
C, N, O
B
Sc, Y, Zr
C
Be, Mg, Sr
D
Li, Be, C
3) How man significant figures are in 302.50?
A
5
B
3
C
4
D
2
4) Change 2,8300g of Fe to moles.
A
28.3 mol
B
50.6 mol
C
506 mol
D
28300 mol
5) Which of the following is a chemical change?
A
Ice cracking
B
Lead melting
C
Milk souring
D
Sugar dissolving
6) A covalent bond is
A
a pure substance consisting of one type of atom
B
a substance consisting of two or more substances mixed together
C
a chemical bond in which on metal joins with a non metal
D
a chemical bond that involves sharing a pair of electrons between 2 non metals
7) Biochemistry is
A
the study of compounds that do not contain carbon
B
the study of the carbon atom and the compounds it forms
C
the study of the chemical processes of living organisms
D
a condition that is deliberatly change by the scientist to test the response in an experiment
8) It is ok to test 3 independent variables
A
true
B
false
9) Rutherford performed the goild foil experiement and found the electron
A
false
B
true
10) oxygen (O2) is an example of
A
a molecule
B
an alloy
C
a salt
D
a mixture
*select an answer for all questions
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