Question

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.

Answer 1

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

Step-by-step 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.

Answer 2

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

Step-by-step 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.