Thermochemistry

What is the definition of energy in the context of termokimia?

• The ability to conduct electricity

• The ability to reflect light

• The capacity to store heat

• The ability to do work

What is the term used to describe a system that allows both mass and energy transfer with its surroundings?

• Open system

• Isolated system

• Closed system

• Dynamic system

What is the standard enthalpy change of formation (ΔH0f) for a compound?

• The change in heat when 1 mole of a compound is formed from its elements

• The change in heat when 1 mole of a compound reacts with oxygen

• The change in heat when 1 mole of a compound is dissolved in water

• The change in heat when 1 mole of a compound is vaporized

According to the Hess's law, what happens to the enthalpy change when two or more chemical equations are added to produce another chemical equation?

• The enthalpy change is multiplied

• The enthalpy change is added

• The enthalpy change is divided

• The enthalpy change is subtracted

what is the standard enthalpy of formation in KJ?

• -110,5

• 110,5

• -393,5

• 393,5