Use of Techniques, Apparatus and Materials
66 questions· page 1 of 7
The apple tested positive with Benedict’s solution and negative with both biuret solution and iodine solution. Use this information to complete the table with the student’s observations at the end of the tests.
| test solution | observation | conclusion |
|---|---|---|
| Benedict’s solution | positive | |
| biuret solution | negative | |
| iodine solution | negative |
Describe how the student could test the apple for the presence of fat. Include the observation for a positive result.
State and explain a safety precaution the student must take when carrying out the fat test in (d)(i).
precaution = ______
explanation = ______
Describe a food test that you could carry out to show that the ripe banana S2 contains more reducing sugar than the unripe banana S1, including at least one safety factor.
______
Complete the table below by describing the appearance of the two pieces of S1 and S2.
| exposed to the air | in S3 | |
|---|---|---|
| S1 | ||
| S2 |
Outline, but do not carry out, an investigation to find out the effect of pH on the changes you observed.
______
The apple tested positive with Benedict's solution and negative with both biuret solution and iodine solution. Use this information to complete the table with the student's observations at the end of the tests.
| test solution | observation | conclusion |
|---|---|---|
| Benedict's solution | positive | |
| biuret solution | negative | |
| iodine solution | negative |
Describe how the student could test the apple for the presence of fat. Include the observation for a positive result.
______
State and explain a safety precaution the student must take when carrying out the fat test in (d)(i).
precaution = ______
explanation = ______
Some of the outer cells in the photomicrograph contain small particles.
Describe in detail how you would prepare a section of the root for observation under the microscope to see whether these cells contain starch.
State which reagent you will use for the test for starch and describe how you will use it.
Details of possible results are not required.
______
Explain why the tile, cutting device and stirring rod were cleaned after using them on the potato.
______
Describe how you would test the apple for protein, and state what you would observe if protein was present and not present.
test = ______
protein present = ______
protein not present = ______
Describe how you would carry out a test to demonstrate the presence of reducing sugar in each of these two solutions.