Edexcel 6A 6B Notes Chemistry

What does the symbol ΔH represent in thermodynamics?

• Temperature change

• Enthalpy change

• Volume change

• Pressure change

What is the standard temperature used when defining standard enthalpy of reaction?

• 273 K

• 298 K

• 300 K

• 310 K

Which of the following is a component of chemical energy?

• Heat capacity

• Temperature

• Kinetic energy

• Entropy

Which process transfers heat energy from the system to the surroundings?

• Exothermic

• Endothermic

• Isothermal

• Adiabatic

The heat energy change, ΔHΔHΔH, is measured at constant (a)   .

Heat energy is directly proportional to the absolute (a)   of a substance.

Enthalpy is the (a)   energy of a system plus the energy required to make room for the system by displacing its surroundings.

(a)   energy is the sum of the kinetic energy and potential energy of a substance.

Enthalpy change is the energy transferred between a system and its surroundings at constant volume.

• True

• False

Potential energy is related to the motion of particles in a substance.

• True

• False