Copper (II) oxide is mixed with organic compound during combustion analysis. The purpose is
A. to carry out complete combustion
B. to reduce the economy of the process
C. to reduce the time for completion of the reaction
D. all of the above
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A. to carry out complete combustion
B. to reduce the economy of the process
C. to reduce the time for completion of the reaction
D. all of the above
A. 6
B. 5
C. 4
D. 3
A. 2 g
B. 20 g
C. 40 g
D. 80 g
A. a hypothesis
B. a fact
C. a law
D. an observation
A. CO is 1.25 times faster than CO2
B. CO is 3.75 times faster than CO2
C. CO is 1.25 times faster than CO
D. Both diffuse at the same rate
A. Hydrogen bonding
B. Vander Waals force
C. Forces among the polar molecules
D. Ionic bond
A. It may be the first state of matter
B. It is not a phase transition
C. It is a conductor of electricity
D. All of the above