Food Tests

What is the first step in preparing a food sample for chemical testing?

• Transfer the paste to a beaker and add more distilled water

• Filter the solution to remove suspended food particles

• Add a few drops of iodine solution

• Grind the food sample with some distilled water using a mortar and pestle

What color does the iodine solution turn if starch is present in the food sample?

• Orange

• Yellow

• Blue-black

• Green

What is added to the food solution to test for sugar such as glucose?

• Benedict solution

• Barley red solution

• Iodine solution

• Ethanol

What indicates the presence of a large amount of sugar in the Benedict's test?

• A green color

• A yellow color

• A brick red color

• A blue color

What color change indicates the presence of protein in the Biuret test?

• From orange to blue-black

• From blue to purple or lilac

• From yellow to brick red

• From blue to green

What forms if lipids are present in the test for lipids?

• A blue-black color

• A purple or lilac color

• A brick red color

• A white cloudy emulsion

What safety precaution is emphasized when carrying out these chemical tests?

• Wearing safety goggles

• Using a flame retardant apron

• Working in a well-ventilated area

• Wearing disposable gloves

Tags

NGSS.HS-ETS1-3