Phase Diagrams and Potential Energy Diagrams

Front

What is the sign of ΔH for all endothermic reactions?

Back

Positive

Front

What letter represents the activation energy in a potential energy diagram?

Back

A

Front

At -60 °C, which statement is true for carbon dioxide?

Back

It can exist as a solid or a gas, depending on pressure.

Front

What type of reaction is characterized by a release of energy?

Back

Exothermic

Front

What is the normal melting point of CO₂?

Back

It doesn't have a normal melting point.

Front

Define a phase diagram.

Back

A graphical representation showing the phases of a substance at different temperatures and pressures.

Front

What does the term 'activation energy' refer to?

Back

The minimum energy required for a chemical reaction to occur.

Front

What is the significance of the triple point in a phase diagram?

Back

It is the condition at which all three phases (solid, liquid, gas) coexist in equilibrium.

Front

What does a potential energy diagram illustrate?

Back

The energy changes during a chemical reaction, showing reactants, products, and activation energy.

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy from its surroundings.