Topic 1) Movement of substances Flashcards
concentration gradient
the more particles there are in a certain volume, the more concentrated those particles are
high to low concentration
down the concentration gradient
low to high concentration
against the concentration gradient
substances that move by diffusion
oxygen
carbon dioxide
glucose
diffusion
the movement of particles from an area of high concentration to low concentration, down the concentration gradient
passive
no energy required
what makes active transport different to diffusion
active transport requires energy, diffusion doesn’t
active transport
the movement of particles from a low concentration to high concentration, against the concentration gradient
osmosis
the movement of water from an area of high concentration to an area of low concentration through a semi-permeable membrane
what is the effect of the concentration gradient on osmosis?
the greater the difference, the faster the movement
what is the effect of temperature on osmosis?
the greater the temperature, the faster the movement
what is the effect surface area of membrane on osmosis?
the longer the surface area, the faster the movement
control variable
something that is held constant
dependent variable
the variable that changes as a result of he independent variables change
independent variable
the variable that is being measured
what is the practical for osmosis?
investigating osmosis in potatoes
what is the independent variable for the osmosis investigation?
the concentration of the sucrose solution
-range of 0% - 100%
what is the dependent variable for the osmosis investigation?
the change in mass of the potato cylinders
what is the control variable in the osmosis investigation?
the time that each cylinder is left in the solution
the size of each cylinder
