Experiments

Question 1

Experiment: prepare a sample of cheek cells for investigation under the microscope

Answer 1

Wipe the cotton bud inside of your cheek. Rub the the cotton bud onto the centre of a microscope slide. Put one drop of methylene blue stain on top of where the cells have been put on the slide and place a cover slip onto the slide at a 45° angle to avoid bubbles

Question 2

% Experiment: prepare a sample of onion cells for investigation under the microscope

Answer 2

Use a tweezers to carefully peel off a thin layer of the onion. Place the membrane on the microscope slide in a flat layer. Place a very small drop of iodine on to the membrane. Carefully lower a cover slip on top of the membrane at a 45° angle to avoid bubble

Question 3

Experiment: Find the density of a stone

Answer 3

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Question 4

Food test: test for fat

Answer 4

What chemical do you use, no chemical brown paper. What is the colour change: translucent stain

Question 5

Food test: test for starch

Answer 5

What chemical do you use: iodine. What is he colour change for it: brown/red to black/blue

Question 6

Food test: test for protein

Answer 6

What chemical do you use: biuret solution What is he colour change for it: Blue to purple

Question 7

Food test: test for glucose

Answer 7

What chemical do you use: Benedict’s solution. What is he colour change for it: Blue to brick red