Changes of State and Particle Model Practice Questions
Question 1
Q1 (2 marks)
Define the term 'melting point'.
Question 2
Q2 (3 marks)
Explain why the melting point of a pure substance is constant.
Question 3
Q3 (3 marks)
A solid has a mass of 50g and a volume of 10cm³. Calculate its density.
Question 4
Q4 (2 marks)
Describe the particle arrangement of a liquid.
Question 5
Q5 (3 marks)
Explain why a gas exerts pressure on the walls of its container.
Question 6
Q6 (4 marks)
Calculate the change in internal energy when 100kJ of heat is added to a system at constant volume.
Question 7
Q7 (2 marks)
Define the term 'latent heat of vaporization'.
Question 8
Q8 (3 marks)
Explain the role of intermolecular forces in determining the boiling point of a liquid.
Question 9
Q9 (4 marks)
A gas has a volume of 20cm³ at a pressure of 20kPa. If the volume increases to 40cm³, calculate the new pressure. (Assume temperature remains constant.)
Question 10
Q10 (3 marks)
Describe an experiment that demonstrates the random motion of particles in a gas.