RECENT ACTUAL COMPLETE REAL EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+ / NEWEST
EXAM / JUST RELEASED!!
Hydrogen fuel cell advantages and disadvantages - ANSWER-
+ less pollution
+ greater efficiency (less heat energy
wasted)
-
expensive
- safety issues storing and
transporting H2
- H2 produced by electrolysis of water (uses
electricity)
What happens if current flows in an electrochemical cell? -
ANSWER--reactions
occur separately at each
electrode
-voltage falls to zero as reactants
used up
, Strong acid - ANSWER-an acid that dissociates completely in
aqueous solution
Weak acid - ANSWER-an acid that only slightly dissociates in
aqueous solution equivalence point of a titration - ANSWER-The
point at which the unknown solution has exactly reacted with the
known solution. Neither is in excess Sudden vertical part of pH
curve
Buffer - ANSWER-A solution that resists changes in pH when
small amounts of
acid or base are
added.
Reaction sodium with oxygen - ANSWER-Yellow flame to
produce white solid
Reaction of Mg with oxygen - ANSWER-White flame to give
white solid smoke
Reaction of Al with oxygen - ANSWER-White flame to give
white solid smoke
Reaction of Si with oxygen - ANSWER-White flame to give white
solid smoke
Reaction of P with oxygen - ANSWER-White flame to give white
solid smoke