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CHEMISTRY: FINAL EXAM REVIEW
UPDATED ACTUAL EXAM WITH CORRECT
SOLUTIONS.
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 1 / 2
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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.
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