CPT Chemical Process Fundamentals & Reactions

Question 1

What does Le Chatelier's Principle state about a chemical system at equilibrium?

Accepted Answer

The system will shift to counteract any stress applied to it

Answer

The reaction rate always increases when temperature drops

Answer

Catalysts change the position of equilibrium

Answer

Pressure has no effect on gas-phase reactions

Question 2

Which of the following best describes an exothermic chemical reaction?

Accepted Answer

A reaction that releases heat into the surroundings

Answer

A reaction that absorbs heat from the surroundings

Answer

A reaction that occurs only at low temperatures

Answer

A reaction that requires a catalyst to proceed

Question 3

What is the primary role of a catalyst in a chemical reaction?

Accepted Answer

It lowers the activation energy without being consumed

Answer

It is consumed during the reaction to produce more product

Answer

It increases the equilibrium yield of the products

Answer

It raises the temperature required to initiate the reaction

Question 4

In a process plant, pH is a measure of which property of an aqueous solution?

Accepted Answer

Hydrogen ion (H⁺) activity or acidity/basicity

Answer

Concentration of dissolved solids

Answer

Oxidation-reduction potential

Answer

Total dissolved oxygen content

Question 5

Which statement correctly distinguishes a physical change from a chemical change?

Accepted Answer

Physical changes alter form or state without producing new substances

Answer

Physical changes always produce new substances with different chemical formulas

Answer

Chemical changes are always reversible under normal conditions

Answer

Chemical changes do not involve any energy transfer

Question 6

What unit is most commonly used to express the rate of a chemical reaction in a process setting?

Accepted Answer

Moles per liter per second (mol/L·s)

Answer

Kilograms per cubic meter (kg/m³)

Answer

Joules per mole (J/mol)

Answer

Pascals per kelvin (Pa/K)

Question 7

When temperature increases in a reversible exothermic reaction, what shift in equilibrium is expected?

Accepted Answer

Equilibrium shifts toward the reactants

Answer

Equilibrium shifts toward the products

Answer

Equilibrium remains unchanged

Answer

Activation energy decreases and yield increases