AP Chemistry Question of the Day --3

Here comes the answer to question 2 I posted yesterday. The correct answer is D. 

Conditions affecting reaction rate include:

• Nature of the reactants. The stronger the bonds in the reactants, the more difficult to break them and the slower the reaction will be. 
• Temperature: the higher the temperature, the faster the reaction.
• Catalyst: Increase the rate of the reaction by taking an alternate reaction path and lowering the activation energy.
• Concentration of the reactants: The higher the concentration, the faster the reaction goes. This is not always true though. It is true only if the substance is part of the rate law.
• Surface area: in a heterogeneous reaction, the bigger the surface area, the faster the reaction goes.

So, D is the correct answer.

Following is Question 3 of the series:

3. A 100 g sample of a metal was heated to 100C and then quickly transferred to an insulated container holding 100 g of water at 22C. The temperature of the water rose to reach a final temperature of 35C. Which of the following can be concluded?

A.  The metal temperature changed more than the water temperature did; therefore the metal lost more thermal energy than the water gained.
B.  The metal temperature changed more than the water temperature did, but the metal lost the same amount of thermal energy as the water gained.
C.  The metal temperature changed more than the water temperature did; therefore the heat capacity of the metal must be greater than the heat capacity of the water.
D.  The final temperature is less than the average starting temperature of the metal and the water; therefore the total energy of the metal and water decreased.

I will post the answer and explanation tomorrow.

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