What does a scientist observe in a chemical's reaction rate?

the speed at which the reactants increase in temperature over a given time

the speed at which the reactants are formed over a given time

the speed at which the reactants reach chemical equilibrium over a given time

the speed at which the reactants change to products over a given time.

the speed at which the reactants change to products over a given time.

Explanation:

The reaction rate of a chemical refers to the speed at which chemical reactions with that chemical occur. That is, it refers to the speed at which the reagents change to products during a certain period.

One of the factors that interfere with the speed, speed or rate of development of a chemical reaction is the concentration of the reagents. For this reason, when the scientist is evaluating the reaction rate of a chemical substance, he wants to determine the amount of time that substance can be transformed into another.

The correct answer is the speed at which the reactants change to products over a given time.

Explanation:

Reaction rate of a chemical reaction can be defined as the amount of reactant converted into product within a given period of time.

A = B

Here A is converted to B in t second time then the reaction rate is

-d[A]/dt

The - sign signifies the decrease in the amount of reactant. The unit of rection rate is mole/sec.