Enthalpy and Exothermic Reactions Quiz

What happens to the temperature of the environment during an exothermic reaction?

• It decreases

• It remains constant

• It increases

• It fluctuates

What is the enthalpy change during an exothermic reaction?

• Positive

• Negative

• Zero

• Undefined

What type of control is a reaction under if the rate is too slow?

• Thermodynamically controlled

• Kinetically controlled

• Pressure controlled

• Volume controlled

What is the enthalpy of the reactants compared to the products in an exothermic reaction?

• Higher

• Lower

• Equal

• Unrelated

What is the thermodynamic possibility of exothermic reactions?

• Impossible

• Thermodynamically possible

• Rarely possible

• Always impossible

During an endothermic reaction, what happens to the energy of the system?

• It decreases

• It remains constant

• It increases

• It fluctuates

What is the sign of ΔH in an endothermic reaction?

• Negative

• Zero

• Positive

• Undefined

What does the surroundings refer to in a chemical reaction?

• The substances that are reacting

• The reaction itself

• Everything else except the reacting substances

• The products of the reaction

What is the standard pressure used in enthalpy change calculations?

• 100 kPa

• 1000 kPa

• 10 kPa

• 1 kPa

What is the relationship between the enthalpy of products and reactants in an endothermic reaction?

• Products have higher enthalpy

• Reactants have higher enthalpy

• Enthalpy is equal

• Enthalpy is unrelated