Question

Look at the graph,
Choose the correct equation from the following which best suited to the above graph.

• A. $\left[A_t\right]=[A{]}_0-kt$
• B. $\left[A_t\right]=[A{]}_0+kt$
• C. $\left[A_t\right]=\left[A_0\right]e^{-kt}$
• D. $\left[A_t\right]=k{t}^2+\left[A_0\right]$

Answer 1

The correct option is A $\left[A_t\right]=[A{]}_0-kt$

The equation is $\left[A_t\right]=\left[A_0\right]-kt$

On comparing it with general straight line equation,

$Y=mx+c$

Slope $\left(m\right)=-k$

Intercept $\left(C\right)=\left[A_0\right]$

Hence, the correct option is $\text{A}$