Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Food Tests
Leaving Cert - Food test Experiments
| Question | Answer |
|---|---|
| What indicator is used in the Reduced Sugars test? | Benedict's Solution. |
| What is the starting colour of the Benedict's Solution? | Blue. |
| What is the first step in setting up the Reduced Sugars experiment? | Dissolve glucose in deionised water in a test tube. |
| Second step in the Reduced Sugars experiment? | Add an equal volume of Benedict's solution to the test tube with the glucose solution in. |
| The third step of the Reducing sugars experiment? | In a second test tube mix equal amounts of deionised water and Benedict's Solution. |
| What id the purpose of the second test tube in the Reducing Sugars experiment? | A control to compare the results to. |
| What is the fourth step in the Reducing Sugars experiment? | Heat the two test tubes in a boiling water bath. |
| What colour changes should you expect in the Reducing Sugars experiment if there are Reducing Sugars present? | If there are Reducing Sugars present the solution with the sugars and Benedict's solution should turn from blue to red (brick red). |
| Why does the control test tube in the Reducing sugars experiment not change colour? | Because there are no Reducing sugars in the control test tube. |
| What is the first step in the Lipids food test? | Label a piece of brown paper/filter paper as lipid. |
| Second step of the Lipid food test? | Rub a small piece of butter or cooking oil on the paper. |
| The third step in the Lipids food test? | Repeat the process but instead of labelling the paper Lipids, it should be labelled water and a few drops of water should be placed on to it. |
| What is the fourth step in the Lipids food test? | Leave the two pieces of paper left over a radiator to dry? |
| What is the result of leaving the two pieces of paper over a radiator in the Lipids food test? | The paper labelled Lipids will have a permanent (translucent) stain on it. The water paper will have no stain. The water paper acts as a control in this experiment. |
| What indicator is used in the starch food test? | Iodine stain. |
| What is the first step in the Starch Food experiment? | Add a few drops of iodine solution to some starch dissolved in water. |
| The second step of the Starch Food experiment? | Add a few drops of iodine to water in a seperate test tube. This acts as the control. |
| What results should be seen from the Starch Food experiment? | - The iodine in the starch-water solution should turn a blue-black or purple colour. - The starch absent solution (control) should stay red-yellow. |
| What is the name of the indicator in the Protein food experiment? | Biuret Solution. |
| What is the colour of the Biuret solution? | The solution is blue due to the copper sulphate. |
| What is the first step in the Protein experiment? | Dissolve a sample of soluble protein (egg white or milk) in water. |
| Second step of the Protein Experiment? | Add Sodium Hydroxide (NaOH) (colourless) until the solution clears. |
| The third step in the Protein experiment? | Add a few drops of dilute Copper Sulphate (CuSO4) (Blue). |
| How do you create the control for the Protein experiment? | Add NaOH and CuSO4 (Biuret Solution) to water in a seperate test tube. |
| If protein is present in a solution what colour will the solution change to? | If protein is present in the non control solution the blue colour from the Biuret solution will change to a purple-violet colour. |
Created by:
AW117
Popular Biology sets