(E) 2.43
- A student made the following observations in the laboratory:
(a) Sodium metal reacted vigorously with water while a strip of
magnesium did not seem to react at all.
(b) The magnesium strip reacted with dilute hydrochloric acid faster
than an iron strip.
(c) A copper rivet suspended in silver nitrate solution was covered
with silver-colored stalactites in several days, and the resulting
solution had a blue color.
(d) Iron filings dropped into the blue solution were coated with an
orange color.The order of decreasing strength as reducing agents is:(A) Na, Mg, Fe, Ag, Cu
(B) Mg, Na, Fe, Cu, Ag
(C) Ag, Cu, Fe, Mg, Na
(D) Na, Fe, Mg, Cu, Ag
(E) Na, Mg, Fe, Cu, Ag
A sample of ethyl alcohol and water that were previously mixed in the
laboratory must now be separated. Which separation technique could
accomplish this?
(A) Filtration
(B) Magnetism
(C) Visual inspection
(D) Distillation
(E) Separating funnel
Which of these statements is NOT correct?
(A) In an exothermic reaction, ΔH is negative and the enthalpy
decreases.
(B) In an endothermic reaction, ΔH is positive and the enthalpy
increases.
(C) In a reaction where ΔG is negative, the forward reaction is
spontaneous.
(D) In a reaction where ΔG is positive, ΔS may also be positive.
(E) In a reaction where ΔH is positive and ΔS is negative, the forward
reaction is spontaneous.- A student filled a eudiometer with 32. milliliters of oxygen and 4.0 milliliters
of hydrogen over mercury. How much of which gas would be left uncombined