Monday
June 29, 2015

Homework Help: Chemistry

Posted by Sadie on Thursday, June 24, 2010 at 8:57pm.

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.
(D?)

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)

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.
(A?)

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.
(A?)

In general, anode is to _________ as cathode is to __________,and a flow of electrons will go from __________ to __________.


A.reduction,oxidation,anode,cathode
B..reduction,oxidation,cathode,anode
C.oxidation, reduction,cathode,anode
D.oxidation,reduction,anode,cathode
(pretty sure it is C)

How much heat is released 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)

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