Question

The rate constant of a reaction depends on:
A. Temperature
B. Mass
C. Weight
D. Time

Answer 1

Hint: The constant rate is denoted by $k$, and is also known as the constant reaction rate or the coefficient of reaction rate. It is temperature dependent.

Complete step-by-step answer:
Depending on the nature of the reacting compounds, the process of chemical transition, the temperature and other variables, chemical reactions proceed at significantly different rates. In general, reactions in which atoms or ions which are electrically charged particles combine, occur very rapidly, while those in which covalent bonds i.e. bonds in which atoms share electrons are broken are much less temperature-dependent. The speed of the reaction can vary with the temperature, the pressure and the number of reactants present for a given reaction. Reactions typically slow down due to the degradation of the reactants as time goes by. In some cases, the addition of a substance, called a catalyst, which is not itself a reactant, accelerates a reaction. The rate constant, or the particular rate constant, is the proportionality constant in the equation that describes the relationship between a chemical reaction rate and the reaction product concentrations. Measuring and understanding reactions forms the chemical branch known as chemical kinetics.
An important expression to be remembered is $k = A{e^{\dfrac{{ - Ea}}{{RT}}}}$
Where $k$ is rate constant
$A$ is the frequency of particle collision
$E_a$ is the activation energy
$R$ is the universal gas constant
$T$ is the absolute temperature
Hence the rate constant of a reaction depends upon Temperature and our option A is the correct answer.

Note: The rate constant is known as the constant of proportionality which explains the relation between the reactant's molar concentration and the rate of a chemical reaction. Also, we must always remember the expression mentioned $k = A{e^{\dfrac{{ - Ea}}{{RT}}}}$.