Figure 6 shows the apparatus used by some students in a laboratory to illustrate diffusion of a solid (copper sulphate crystal) in water. Outline a procedure using the apparatus and materials in Figure 6 to investigate the hypothesis, ‘Temperature increases the rate of diffusion’. (4 marks) *

a

explanation:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.