Chemistry (kinetics)

the answer is C

→ A is suitable because Br2 is colored (orange/brown) and as the reaction continues, the colour gets weaker.

→ B is suitable because

answer is A because 0 order is rate = k

the answer is A because if you look at the products, you’ll notice that there’s ions. also, if they ask about titrating then they might ask:
“Which method could be used to monitor the progress of the reaction by taking samples at regular time intervals?”

• “Samples of the reaction mixture are removed at regular intervals. Describe how the concentration of X could be determined.”

• “Which method could be used to determine the concentration of the reactant at different times during the reaction?”

• “Explain how titration could be used to obtain rate data.”

• “Describe a method for determining the concentration of X at regular intervals during the reaction.”

answer is rate = k[CH3N2CH3] because it’s first order

remember:

0 order - rate = k

1st order - rate = k[A[

2nd order - rate = k[A]2

first: divide 9 by 2. 9/2 = 4.5

find 4.5 on the y axis and draw across the curve

second: halve 4.5 now by 2. 5.4/2 = 2.25

find 2.25 on the y axis and draw across the curve

this happens at 270 mins.

then you do 270-135 cuz 135 is the number u got from 4.5 and 2.25

then u compare the half-life to see if it’s constant so that you’ll know if it’s first order or not.