1.
What is the formula for Arrhenius equation?
Correct Answer
C. K=A*exp (-E a/R*T)
Explanation
The Arrhenius equation is used to describe the temperature dependence of reaction rates. It states that the rate constant (k) of a reaction is equal to the pre-exponential factor (A) multiplied by the exponential term, which is given by exp (-Ea/RT), where Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin. Therefore, the correct formula for the Arrhenius equation is k = A*exp (-Ea/RT).
2.
What does k represent?
Correct Answer
A. Rate coefficient
Explanation
The correct answer is "Rate coefficient". In chemical kinetics, the rate coefficient (k) represents the proportionality constant between the rate of a reaction and the concentrations of the reactants. It determines the speed at which a reaction takes place and is specific to each reaction. The rate coefficient is determined experimentally and is influenced by factors such as temperature, pressure, and catalysts.
3.
What does A represent?
Correct Answer
C. Constant
Explanation
The correct answer is "Constant." A represents a constant value, which means it does not change. It is not related to Arrhenius value, Archimedes principle, or area. A constant can be used in various mathematical equations and formulas to represent a fixed value that remains unchanged throughout the calculation.
4.
What does Ea represent?
Correct Answer
A. Activation energy
Explanation
Ea represents activation energy, which is the minimum amount of energy required for a chemical reaction to occur. It is the energy barrier that must be overcome for reactant molecules to transform into products. Activation energy determines the rate at which a reaction proceeds, with higher activation energy leading to slower reactions. This term is commonly used in the context of the Arrhenius equation, which relates the rate constant of a reaction to the activation energy and temperature.
5.
What does R represent?
Correct Answer
C. Universal gas constant
Explanation
R represents the Universal gas constant. This constant is used in the ideal gas law equation to relate the pressure, volume, and temperature of a gas. It is denoted by the symbol R and has a value of 8.314 J/(mol·K). The Universal gas constant is an important constant in thermodynamics and is used in various calculations involving gases.
6.
What does T represent?
Correct Answer
B. Temperature
Explanation
T represents temperature.
7.
What is the value of R?
Correct Answer
C. 8.314 x 10^-3 kJmol^-1K^-1
Explanation
The value of R is 8.314 x 10^-3 kJmol^-1K^-1.
8.
In logarithmic form, how is the equation written?
Correct Answer
A. Ln k = ln A - Ea/RT
Explanation
The equation is written in logarithmic form as ln k = ln A - Ea/RT. This form represents the natural logarithm of the rate constant (ln k) being equal to the natural logarithm of the pre-exponential factor (ln A) minus the activation energy (Ea) divided by the gas constant (R) multiplied by the temperature (T).
9.
Who proposed the equation?
Correct Answer
B. Svante Arrhenius
Explanation
Svante Arrhenius proposed the equation.
10.
When was the equation proposed?
Correct Answer
B. 1889
Explanation
The equation was proposed in 1889.