1. Materia: Practical skills Senior 2
Profesora: Ma. Magdalena Ravagnan
Contenido nodal: Investigating biological processes
TERCER TRIMESTRE
Fecha de presentación: Wednesday December 12th
1) Diffusion
a- Complete the following sentences with the words in the box.
diffusion move about remove spaces spread out evenly can’t movement
Diffusion is the _____________ of particles in a fluid from one region to another. It occurs because of two properties of
fluids: the particles have ___________ between them and are able to _________ ___________.
If we start off with two types of fluid which are separated, and then ___________ the barrier which is separating them
then _________________ will occur. The particles from both regions will _________ _________ and move in the spaces
between other particles. The particles of each fluid will continue to mix until they are ______________ distributed.
Diffusion ___________ happen in solids because their particles can’t move around.
b- In the boxes below, draw the arrangement of particles at each of the three stages of diffusion.
1) The two types of particle 2) The barrier is removed and the 3) The particles are evenly distributed
are separated by a barrier particles have begun to mix

2. 2) Osmosis
The diagram shows a beaker which contains a concentrated and a dilute solution separated by a partially permeable
membrane.
Draw a similar diagram to show the liquid levels after an hour or two.
Membrane
Dilute Concentrated
solution solution