Hess's Law and Enthalpy Diagram

Front

What is Hess's Law?

Back

Hess's Law states that the total enthalpy change for a reaction is the same, regardless of the number of steps the reaction takes.

Front

How is an endothermic reaction represented in an enthalpy diagram?

Back

In an enthalpy diagram for an endothermic reaction, the arrow is drawn going up, indicating that energy is absorbed.

Front

What is the unit of energy in the International System of Units (SI)?

Back

The unit of energy is the Joule (J).

Front

What characterizes an endothermic reaction?

Back

An endothermic reaction is characterized by the absorption of energy from the surroundings.

Front

Which of the following is an example of an endothermic process?

Back

An ice cube melting on a countertop is an example of an endothermic process.

Front

In an exothermic reaction, what happens to energy?

Back

In an exothermic reaction, energy is released to the surroundings.

Front

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

Back

The surroundings get hotter during an exothermic reaction.

Front

What is the difference between exothermic and endothermic reactions?

Back

Exothermic reactions release energy, while endothermic reactions absorb energy.

Front

What is an example of an exothermic reaction?

Back

Combustion of natural gas in a Bunsen burner is an example of an exothermic reaction.

Front

What is the significance of enthalpy in chemical reactions?

Back

Enthalpy is a measure of the total energy of a thermodynamic system, important for understanding heat transfer in reactions.