Activity 3.3: Investigation: Can We Prove a Substance Is Food?

What will you observe during the teacher demonstration in the investigation to prove if a substance is food?

• The substance changes color.

• The substance emits a smell.

• The substance dissolves in water.

• The substance remains unchanged.

Complete the following: The color of the food substance before the test is ____.

• Red

• Green

• Blue

• Yellow

Complete the following: The color change of each of the food substances once the indicator has been applied is ____.

• Red

• Blue

• Green

• Yellow

Complete the following: The procedure that your teacher uses to do the tests is ____.

• standardized

• random

• unplanned

• chaotic

What color does glucose turn when tested with Sudan III?

• Clear Yellow Orange to light blue

• Dull maroon

• Light purple

• Bright red

What is the color change for starch when tested with Sudan III?

• A) Clear Dark blue Light blue Clear to light blue

• B) Dull maroon

• C) Pale yellow Yellow Bubble of blue Clear to light blue

• D) Bright red

Fill in the blank: Albumin turns ______ when tested with Sudan III.

• Clear

• Pale yellow

• Green

• Greenish yellow

Discuss what happened to the color of each tube when the indicator was added to the substances. Complete the chart as you discuss the results.

• The color of each tube changed to red.

• The color of each tube remained the same.

• The color of each tube changed to blue.

• The color of each tube changed to green.

What is the color when iodine is used to test for starch and the substance is not in the sample?

• dark blue yellow.

• red

• green

• purple

What does Benedict's solution test for?