Science | Student Guide
Science
Student Guide
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Objectives
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Questions and Notes
Questions
Notes
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Summary
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Science | Student Guide
Use this model Note Sheet as an example.
Investigating Biological Compounds
Objectives



Explain that various tests can be used to detect the presence of certain macromolecules.
Experiment with various chemical indicators to identify the presence or absence of macromolecules.
Gather and analyze data.
Questions and Notes
Questions
Notes
What are chemical indicators?

Chemical indicators allow scientists to identify compounds in
materials.
How are chemical indicators used?

Chemical indicators
o Can be used to test products.
o Undergo a color change in the presence of certain
macromolecules.
What is a macromolecule?

A macromolecule is a large molecule, especially applied to
carbohydrates, proteins, lipids, and nucleic acids.
How is iodine used as a chemical
indicator?
How are sodium hydroxide and
copper sulfate used as chemical
indicators?
Examples of chemical indicators

Iodine
o Identifies starch (a complex carbohydrate).
o Color change: brownish to dark blue

Sodium hydroxide (NaOH) and copper sulfate (CuSO4)
o Identify protein.
o Color change: blue to purple
Summary
Chemical indicators are used to identify the presence of macromolecules in materials. Chemical indicators
change color in the presence of certain compounds.
© Stride, Inc. All rights reserved. No reproduction without written consent of Stride, Inc.
Page 2 of 2