## Writing First Order Reactions

$\frac{d[R]}{dt}=-k[R]; \ln [R]=-kt + \ln [R]_{0}; t_{\frac{1}{2}}=\frac{0.693}{k}$

Marina Gollas 1A
Posts: 36
Joined: Fri Sep 28, 2018 12:20 am

### Writing First Order Reactions

Does Lavelle want us to write the exponent of 1 for first order reactions? I just wanted to clarify.
An example could be:
rate=k[A]^1[B]^2

or does he want no exponent of 1? such as rate=k[a][B]^2

Andre_Galenchik_2L
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

### Re: Writing First Order Reactions

Either way is fine as they are equivalent.

Jeannine 1I
Posts: 73
Joined: Fri Sep 28, 2018 12:27 am

### Re: Writing First Order Reactions

He mentioned in class that you usually don't write the "1" since it's already implied, just like how in a math equation where x is to the first power, we write it as "x" instead of "$x^{1}$".

Lynsea_Southwick_2K
Posts: 55
Joined: Fri Sep 28, 2018 12:25 am

### Re: Writing First Order Reactions

What I do is write all of the exponents even if it is 0 or 1, but then I simply further and would take out the value to the 0 as it would be 1, and I would not write to the first power.

Jack Hewitt 2H
Posts: 67
Joined: Fri Sep 28, 2018 12:27 am

### Re: Writing First Order Reactions

The one would be implied just as it would be in a math class.