Office of Curriculum, Technology, & Assessment

Overview: Color changes in chemistry tell chemists about the status of a system and what has occurred in the system.

1.    Indicators, Acid & Base color changes: Discuss pH, explain using film canisters; demonstrate color changes from acids and bases on various indicators including pH and litmus paper;

2.   Show color changes of indicators using carbon dioxide: dry ice added to cylinders with indicator and dilute base in them; "Breath Race" demonstrates how carbon dioxide in our breath can change color of an indicator in a dilute basic solution

3.   Demonstrate titration of base with an acid using phenolphthalein as an indicator. Demonstrate use of magnetic stirrer as part of titration procedure.

4.   Buffer systems: demonstrate the effect of a buffer, milk of magnesia, on a system where acid is added, using an indicator to show changes

5.  Oxidation / Reduction indicators: "Blue bottle" experiment demonstrates an indicator that reflections the presence or absence of free oxygen in water.

6.   Silver salt color changes: mixing a succession of clear liquids shows the appearance and disappearance of colors as successive additions are made. Touches on the formation of complex metal ions, the similarity in color of various silver halide salts and the introduction to the concept of solubility product constants.

These issues will only be touched on and will not go into great depth, so the students will be amazed, entertained and led to believe that many unique events occur in some chemical reactions. Hopefully, this will inspire them to see chemistry as fun and to pursue it further in their education.

Science Standards
3-5

NATURE OF SCIENCE STANDARDS
3-5  

Indicator 1: Understand the nature and origin of scientific knowledge.

Note: Mastery is not expected at these grade levels.

Indicator 2: Apply the skills necessary to conduct scientific investigations.

Note: Mastery is not expected at these grade levels.

PHYSICAL SCIENCE STANDARDS
3-5

Indicator 1: Describe structures and properties of, and changes in, matter.

3.P.1.1. (Comprehension) Describe physical properties of matter using the senses (touch, smell, etc.).

3.P.1.2. (Application) Use tools to relate composition to physical properties.

3.P.1.3. (Application) Demonstrate how a different substance can be made by combining two or more substances.

4.P.1.1. (Comprehension) Describe observable physical changes and properties in matter.

4.P.1.2. (Analysis) Explain how some physical properties remain the same as the mass is changed.

4.P.1.3. (Comprehension) Differentiate between the states of matter caused by changes in temperature using water.

5.P.1.1. (Knowledge) Define matter on the basis of observable physical properties.

NATURE OF SCIENCE STANDARDS
6-8  

Indicator 1: Understand the nature and origin of scientific knowledge.

8.N.1.1. (Comprehension) Differentiate among facts, predictions, theory, and laws/principles in scientific investigations.

Indicator 2: Apply the skills necessary to conduct scientific investigations.

Note: These skills should be taught and practiced in grade-level study of Physical, Life, and Earth/Space Science although mastery is not expected at these grade levels.

6.N.2.1 (Application) Pose questions that can be explored through scientific investigations.

7.N.2.1. (Application) Conduct scientific investigations using given procedures.

8.N.2.1. (Synthesis) Design a replicable scientific investigation.

PHYSICAL SCIENCE STANDARDS
6-8  

After careful consideration of current research and input from educators throughout the state, the Committee revised former standards to facilitate effective instruction and student mastery. Grade six standards emphasize an integration of Physical, Life, and Earth/Space Science. Grade seven standards emphasize Life Science. Grade eight standards emphasize Earth/Space Science. Nature of Science and Science, Technology, Environment, and Society standards continue to emerge over these grades.

Indicator 1: Describe structures and properties of, and changes in, matter.

6.P.1.2. (Application) Classify matter based on physical and chemical properties.

6.P.1.3. (Comprehension) Describe phase changes in matter differentiating between the particle motion in solids, liquids, and gases.

8.P.1.1. (Analysis) Classify matter as elements, compounds, or mixtures.

8.P.1.2. (Application) Use the Periodic Table to compare and contrast families of elements and to classify elements as metals, metalloids, or non-metals.

8.P.1.3. (Comprehension) Compare properties of matter resulting from physical and chemical changes.

Indicator 3: Analyze interactions of energy and matter.

6.P.3.1. (Comprehension) Identify types of energy transformations.

NOTE: Each site must audio mute upon connecting to the session to prevent voice activated moving of the cameras from site to site.

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