What occurs in the process of ionization?
A. Acids dissociate to produce hydroxide ions, as their only negative ions.
B. Strong bases ionize almost completely yielding a maximum quantity of hydrogen ions.
C. Stationary solid ions are produced.
D. Ions are formed by a dissolved molecular substance.
Definitely, A, B, and C are not right so the only logical choice is D; however, I don't like it either. For example, I can dissolve sugar in water, a molecular substance, and it STAYS as a molecular substance without ionizing.
If one species in a redox reaction undergoes oxidation, what happens to the other species?
A. It must undergo oxidation.
B. It must undergo reduction.
C. It may undergo oxidation.
D. It may undergo reduction.
(I think A, and I'm almost sure, however a little doubtful)
It can't be A. If one substance is oxidized, the other MUST be reduced. However, I can think of many redox reactions in which SOME species are neither oxidized not reduced.
Regarding oxidation numbers in redox reactions, which statement is true?
A. The algebraic sum of oxidation numbers in a molecule or compound is zero.
B. Loss of an electron results in a decrease in an oxidation number.
C. Oxidation numbers in a redox reaction tend to shift from left to right.
D. In a redox reaction, oxidation numbers generally remain the same.
I would go with A, also.
Which of the following statements refers most directly to enthalpy?
A. In an endothermic reaction, the sign of ΔH is negative.
B. Potential energy decreases in an exothermic reaction.
C. Molecules in a gas spin or tumble end over end.
D. Molecules in a heated metal vibrate more rapidly.
Yes A does refer to enthalpy; however, an endothermic reaction is a POSITIVE delta H. I would think about B.
In general, anode is to _________ as cathode is to __________,and a flow of electrons will go from __________ to __________.
(pretty sure it is C)
The correct answer is C OR D depending upon the situation. For an electrolysis cell, the correct answer is C. For a battery, the correct answer is D. Not a good question in my opinion.
How much heat is eleased when 200 grams of sodium hydroxide dissolve in water?
A. –210 kJ C. –223 kJ
B. 210 kJ D. 223 kJ
(D, but I want to double check)
I don't know that number; however, it can't be D because an exothermic reaction means delta H is negative. That means it must be A or B.
In the future, please post just one question to a post.
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