Question

@aaronq

Answer 1

this is basically asking if theres a dependence on the rate from the concentration of the reactant

Answer 2

I think it's either C or D. I'm not sure which one.

Answer 3

i also think it's first order, you could do some quick calculations to check

Answer 4

@Australopithecus Which one do you think it is?

Answer 5

You need to determine the order of the reaction, the order of the reaction is denoted by the values of and b in the following general reaction rate equation (note it is rare but you can have 3 or more species in a reaction rate equation but I would rather keep it simple):
\[rate\ =\ k[A]^a[B]^b\]

For a reaction
A + B = C + D

Examples 1:
The sum of a and b give you the Order of the reaction
so if a = 1 and b = 0 then the reaction rate is a + b = 1 + 0 = 1 therefore the reaction is first order, this means that the reaction only depends on the concentration of a, so we have a rate formula of

\[rate\ =\ k[A]^1[B]^0 \]
or
\[rate\ =\ k[A]\]

Example 2
if a =0 and b =0, then a + b = 0 and you have a zero order reaction, meaning that the reaction rate is not dependent on concentration of any of the reactants and you get the following rate formula

\[rate = k[A]^0[B]^0 = k\]

To figure out what order it is you can

Graph concentration (y-axis) vs time x-axis if it is zero order you will get a linear graph if not it will be non-linear
Graph log_10 concentration (y-axs) vs time (x-axis) if it first order you will get a linear graph if not it is second order

See this if you are interested in where this comes from

http://catalog.flatworldknowledge.com/bookhub/4309?e=averill_1.0-ch14_s03#

Answer 6

Okay, so what would the answer be? @sweetburger @Australopithecus

Answer 7

Instead of graphing you could just check to see if the slope changes between the first point to the second and first point to the third

Answer 8

constant slope means the relationship is linear

Answer 9

Ohhh so it is C! Okay, thank you :)

Answer 10

you would just use the formula

\[Slope = \frac{y_2 - y_1}{x_2 - x_1}\]

Answer 11

Yeah, that's what I did :) It's C. Thank you.

Answer 12

Sorry sometimes i over explain, I should expect you know that formula by the 95 ss