1. Determine the overall reaction order for the reaction whose rate law is as follows: rate=k[O3][ClO]:
a. 0
b. 1
c. 2 ***
d. 3
2. For the reaction (A→2B) whose rate law is rate=k, which of the following will change the value of k?
a. adding a catalyst
b. increasing [A]
c. increasing [B] ***
d. decreasing [B]
3. If the sign of a reaction rate is positive, that means
a. The reaction does not go in the reverse direction.
b. It must be the rate for the appearance of a product. ***
c. The reaction is an endothermic reaction.
d. The reaction is an exothermic reaction.
I agree with 1 and 3 but not 2. Hint: The secret to question 2 is to write the rate law equation.
Would it be (b) increase [A] for # 2?
I gave you a hint. What is the rate law equation?
Idk if this is right--k= [A]^1 [B] ^2.
That is almost right.
You don't know the exponents are 1 and 2.They must be determined experimentally. So let's write it as rate = [A]^a[B]^b
Now you know from the problem that rate = k so what must a be and what must b be for rate = k?
I'm not sure how to determine experimentally. is it [A]^0 [B]^1?
close but no cigar. Think about it.
For the rate law of rate = k[A]^a[B]^b, the ONLY way rate = k is for [A]^a[B]^b to be 1; i.e., rate = k*(1)*(1) and the ONLY way [A]^a = 1 is for a to be zero. Likewise b must be zero for [B]^b = 1 so the equation is
rate = k[A]^0[B]^0 = k(1)(1) = k. That means that the rate does not depend on [A] OR [B] because NEITHER A nor B are in the rate equation so the correct answer must not have anything to do with [A]
or [B]. So the correct answer must be ...........
Oh, if it has nothing to do with [A] or [B] is the answer (a) adding a catalyst?
bingo
1. To determine the overall reaction order, you need to add up the individual reaction orders. In this case, the rate law is rate = k[O3][ClO]. The reaction order with respect to O3 is 1, and the reaction order with respect to ClO is also 1. Adding these up, the overall reaction order is 1 + 1 = 2. Therefore, the correct answer is c. 2.
2. For the reaction rate law rate = k, the rate constant, k, is independent of the concentrations of the reactants. This means that changing the concentration of reactants, such as increasing [A] or decreasing [B], will not affect the value of k. The correct answer is c. None of the listed options will change the value of k.
3. The sign of a reaction rate indicates the direction of the reaction. If the rate is positive, this means that the reaction is proceeding in the forward direction, where reactants are being converted to products. Therefore, if the rate is positive, it must be the rate for the appearance of a product. The correct answer is b. It must be the rate for the appearance of a product.