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How Does Temperature Affect The Rate Of Diffusion



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Question
What would be a suitable control for this experiment?
Testing how temperature affects the rate of diffusion. Using discs of beetroot, put the discs onto mounted needles, and put the mounted needles into water baths of different temperatures. After 20mins, remove the beetroot from the water. Using a colourimeter, test the light transmission of the water from all the different temperatures. What would be a suitable control for this investigation?

Answer
The only control you could actually use for a study like this would be a colorimeter reading on plain water, as your frame of reference, or "negative control". Technically you should run such a plain water control at each test temperature, but practically speaking that probably isn't really necessary. Perhaps you could run it at your lowest temperature and at one higher temperature. That should provide the required evidence that all the color you are reading in the test samples is actually due to the beetroot diffusion. You also need to make sure the beetroot discs are all the same diameter and thickness.



Question
How many of these conditions would affect the rate of diffusion across a semi permeable membrane?
- shape of a molecule - size of a molecule - concentration gradient - temperature How many of the above conditions would affect the rate of diffusion across a semi permeable membrane? A.) 1 B.) 2 C.) 3 D.) 4

Answer
D. 4 ALL OF THEM



Question
How does temperature affect the rate of diffusion?
A. An increase in temperature causes faster diffusion by increasing the speed of molecular movement. B. An increase in temperature causes faster diffusion by decreasing the speed of molecular movement. C. An increase in temperature causes slower diffusion by eliminating Brownian movement. D. An increase in temperature has no effect on the rate of diffusion.

Answer
A) The molecules are given more energy, so they move/vibrate faster.




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