Question

Sunita carries out an experiment to investigate diffusion. She uses water and a food dye to find out how the volume of water used affacts the time the dye takes to spread evenly through the water.
Her prediction is that the more water she uses, the longer the time needed for dye to spread through it
a) what variable will she change?
b)What variable should she measure?
c) State two variables that she will need to keep the same
d) How will she ensure her results are reliable?

Answer 1

Answer:

a amount of water

b time

c how much food die and ???

d test them twice

Explanation:

Answer 2

a) Amount of water

b) time

c) amount of food dye and time

d) Repeat experiments for multiple times.

• Sunita must alter the variable water in order to conduct this diffusion experiment. This is due to her prediction that the more water she uses, the longer it will take the colour to spread through it.
• She is therefore increasing the water content in order to examine how a diffusible chemical affects diffusion over time.
• She has to measure that time that in how much time dye is being diffused in water.
• She has to keep that time variable because she presumes that with more water more time is needed. She also has to keep food dye same so that actual results can be found out.
• To check the reliability, she has to carry out the experiment multiple times and if the results remain same every time, here experiment will be proven reliable.

#SPJ2