Science Tests

Testing for simple sugars. 

Aim: To test a sample of food to determine whether it contains simple sugar.

Equipment: Test Tubes, Benedicts solution, a sample of food.

Method:
Step 1- Place about 2 ml of the sample into a test tube and then add 5 drops of benedicts solution.
Step2-Put in a water bath until it changes colour. Do not boil.

Results-
Apple- Positive
potato-positive
Bread-Positive
Milk-Negative
Sugar-Positive
Egg-Positive

Testing for protein.

Aim: To test if a sample of food contains protein.

Hypo:Only the egg will turn purple.

Equipment: Test tube, Sodium hydroxide (haOH), Copper sulfate (coSO), Food sample.

Method:
Step 1- Place about 2 ml of the sample into a test tube and add 5 drops of sodium hydroxide.
Step 2- Add 5 drops of copper sulfate.
Step 3-Shake the test tube gently side to side.

Results:
Apple-Negative
Potato-Negative
Bread-Negative
Milk-Positive
Egg-Positive
Sugar-Negative

Conclusion: The egg and milk turned purple so they have protein in them but the rest didn't. I was nearly right I just didn't think milk would change.

Discussion: They turned purple because they come from animals and you can only get protein when it comes from animals.