Question

$\bf{ \large{ \underline{ \: \: \: Question\: :}}}$
Why do we use negative sign while expressing the rate of the reaction in tearms of reactants ?​

Answer 1

$\huge\pink{\boxed{\green{\mathfrak{\overbrace{\underbrace{\fcolorbox{red}{aqua}{\underline{\pink{✯Answer✯}}}}}}}}}$

The concentration of a reactant always decreases with time, so Δ[A] and Δ[A] are both negative. Since negative rates do not make much sense, rates expressed in terms of a reactant concentration are always preceded by a minus sign to make the rate come out positive.

${\huge{\green{\boxed{\underline{\underline{\pink{\star{\red{itzkrishnab}}}}}}}}}$

Answer 2

$\huge \underline \mathfrak \green{Answer: - }$

$<font color =teal >$

We use negative sign,while expressing the rate of the reaction in terms of reactants because the concentration of a reactant always decreases with time, so Δ[A] and Δ[A] are both negative.

Since negative rates do not make much sense, rates expressed in terms of a reactant concentration are always preceded by a minus sign to make the rate come out positive.

$\large \underline\mathscr \green{hope \: its \: helps...}$