ChemistryFinalExamReviewQuestionsand
Answers.
How many valence electrons are in an atom of chlorine? - Correct Answer 7
How many valence electrons does aluminum have? - Correct Answer 3
Define Reaction Rate - Correct Answer The decrease in concentration of reactants or the
increase in concentr...
Chemistry Final Exam Review Questions and
Answers.
How many valence electrons are in an atom of chlorine? - Correct Answer 7
How many valence electrons does aluminum have? - Correct Answer 3
Define Reaction Rate - Correct Answer The decrease in concentration of reactants or the
increase in concentration of products with time.
How does increasing temperature affect the rate of reaction? - Correct Answer Increasing
temperature causes the kinetic energy to increase. Thus, molecules are moving faster
and colliding more frequently. This causes the rate of reaction to incrase.
If I decrease the concentration of reactant, what happens to the rate of reaction? - Correct
Answer Decreasing concentration leads to less reactants available for collision.
Therefore, reaction rate decreases.
How does surface area influence reaction rate? - Correct Answer By increasing the
surface area of reactant molecules, we are increasing the space or point of contact that
these molecules have available to interact. This causes an increase in the rate of
reaction.
How does a catalyst speed up a chemical reaction? - Correct Answer A catalyst speeds
up a chemical reaction by finding an alternate pathway with a lower activation energy.
Define activation energy. - Correct Answer The energy required to start a chemical
reaction.
Define equilibrium. - Correct Answer Equilibrium is established when the rate of the
forward reaction is equal to the rate of the reverse reaction.
Is energy absorbed or released in an endothermic reaction? - Correct Answer Absorbed.
What is the sign of delta H for an exothermic reaction? - Correct Answer Exothermic
reactions release energy. The sign of delta H is negative.
, When you touch a flask and it feels hot, is this an endothermic or exothermic process? -
Correct Answer Exothermic; heat is being given off.
Define specific heat capacity. - Correct Answer The amount of heat required to raise 1g of
a substance to 1 degrees Celsius.
q=mc(delta)T ; What does "q" stand for? - Correct Answer Heat (kJ)
q=mc(delta)T ; What does "c" stand for? - Correct Answer Specific heat capacity (J / g
degrees C)
What is a hydrogen ion donor called? - Correct Answer An acid.
What is a hydrogen ion acceptor called? - Correct Answer A base.
Feels slippery; acid or base? - Correct Answer Base.
Tastes sour; acid or base? - Correct Answer Acid.
Tastes bitter; acid or base? - Correct Answer Base.
pH > 7 ; acid, base, or neutral? - Correct Answer Base
Define neutralization. - Correct Answer When an acid reacts with a base to form water
and a salt. pH = 7.
Soap; acid or base? - Correct Answer Base (tastes bitter)
Ammonia, acid or base? - Correct Answer Base (drain cleaners are bases).
Lemonade; acid or base? - Correct Answer Acid (tastes sour)
Define solute. - Correct Answer The part of the solution in less amount.
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