What does the first law of thermodynamics state? uestion 13 options: There is and always will be the exact same amount of energy in the universe. As temperature approaches absolute zero, the entropy approaches a constant minimum. Entropy of an isolated system tends to increase. If two systems are in equilibrium with a third, then they are in equilibrium with each other.

Question 2 The following illustration shows a sequence of reactions at equilibrium: O the reaction A => B would be favored O the reaction B => A would be favored LY O the reaction C => B would be favored A = If you place A, B, and C in equal amounts in a test tube, what would happen initially? all the reactions would occur at the same frequency O can not be determined from the information provided c= B C

QUESTION 17 What is the effect of a catalyst on a reaction? O It increases the rate. O It decreases the entropy. O It changes the equilibrium. O It makes the products more stable.

A thermodynamically spontaneous reaction O A. happens quickly, with no addition of energy to the system O"happens quickly whether or not there is an addition of energy to the system В. has the capacity to happen but might not happen quickly has the capacity to happen but only in the presence of a catalyst

uce the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction observations conclusions The reverse of this reaction is always spontaneous but proceeds slower at temperatures below 132. °C. AH is (pick one) AS is (pick one) His (pick one) B This reaction is endothermic. AS is (pick one) This reaction is spontaneous except below 110. °C but proceeds at a slower rate below 135. °C. AH IS (pick one) AS is (pick one)v

What these letters represent? This picture is the effect of the energy graph.

Question 43 Which of the following is NOT a property of water? O exhibit cohesion O Ice is less dense than water water molecules are polar water molecules require a small input of energy to raise the temperature O high heat of vaporization Question 44 The first law of Thermodynamics state that: O energy must come in the form of a three-prong outlet the ultimate source of energy in our universe is the sun energy can be created and destroyed in a vacuum O energy can neither be created nor destroyed

QUESTION 12 What chemical species does chymotrypsin stabilize the most during the course of the reaction? OA. the transition state O B. the substrate OC. the product(s) OD. the ES complex CE. the tetrahedral intermediate

It is not 0.67 or 0.167 or 0.25.

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