ACTUAL COMPREHENSIVE REAL EXAM | FREQUENTLY
MOST TESTED QUESTIONS AND VERIFIED SOLUTIONS
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Why do ionic compounds have high melting points? -
ANSWER-Strong
electrostatic forces between oppositely
charged ions.
What is an exothermic reaction? - ANSWER-A reaction that
releases energy to
the
surroundings.
Bond breaking is _______ and bond forming is _______.
- ANSWER-
Endothermic;
Exothermic
Equation for enthalpy change using bond energies? -
ANSWER-ΔH = ∑(bonds
broken) - ∑(bonds
formed)
, What does Le Chatelier's Principle state? - ANSWER-The
system shifts to
oppose any change in
conditions.
What happens to equilibrium if temperature increases in
an exothermic
reaction? - ANSWER-Shifts to the left
(reactants)
Define oxidation and reduction in terms of electrons. -
ANSWER-Oxidation =
loss of electrons; Reduction = gain of
electrons
What is the oxidation state of oxygen in most compounds? -
ANSWER--2
What is a redox reaction? - ANSWER-A reaction involving both
reduction and
oxidation.
Trend in reactivity of Group 2 elements down the group? -
ANSWER-Increases
down the
group