Unit Test — Unit test Answers
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Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formula equation for this reaction?
A
Upper F subscript 2 (l) plus upper N a (s) right arrow upper N a upper F subscript 2 (s).
B
Upper F subscript 2 (g) plus upper C a (s) right arrow upper C a upper F subscript 2 (l).
C
Upper F subscript 2 (g) plus upper N a (s) right arrow with delta above upper N a upper F subscript 2 (l)
D
Upper F subscript 2 (g) plus upper C a (s) right arrow with delta above upper C a upper F subscript 2 (s).
22
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The compound CO2 is made of
A
two atoms of cobalt.B
one atom of cobalt and two atoms of oxygen.C
two atoms of carbon and one atom of oxygen.D
one atom of carbon and two atoms of oxygen.23
Considering the activity series given for nonmetals, what is the result of the below reaction? Use the activity series provided. F > Cl > Br > IBr2 + NaF
A
no reactionB
Na + FBr2C
NaBr + F2D
Na2F + Br224
According to the law of conservation of
A
chargeB
energyC
massD
momentum25
Burning a piece of wood in fire can be best described as a
A
chemical change because the atoms in wood change their state.B
physical change because the atoms in wood are turned into a gaseous product.C
chemical change because the atoms in wood and oxygen are rearranged.D
physical change because the atoms in wood are turned into black ash.Did you find these answers helpful?
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