Three- and four-mark questions
These are similar to one- and two-mark questions but you will be expected to write in more depth for three- and four-mark questions.
Edexcel questions courtesy of Pearson Education Ltd.
Sample question 1 - Foundation and Higher
Question
Complete each box in the figure to show how particles are arranged in a solid, liquid and gas.
One particle in each box has been drawn for you. [3 marks]
Solid particles must be touching in a regular pattern [1]. Liquid particles should be touching but not regularly arranged [1]. Gas particles should not touch [1].
Do not spend a long time drawing circles to fill the boxes - use the time on other questions.
Sample question 2 - Foundation and Higher
Question
Oxygen cylinders can be used in an ambulance. Explain how particles of oxygen gas exert a pressure on the inside of the cylinder. [3 marks]
The oxygen particles move around at high speed [1]. They collide with the walls of the cylinder [1], exerting a force on the inside of the cyclinder [1].
Sample question 3 - Higher
Question
Describe how the average kinetic energy (KE) of the particles of the gas changes as the temperature of the gas changes. [3 marks]
Average KE increases as the temperature increases [1]. When the KE doubles the temperature in kelvin doubles [1], so it is directly proportional [1].
