University Corporation for Atmospheric Research
Ucar: Cycles of the Earth System: Carbon Dioxide Sources and Sinks
Students will use a chemical indicator (BTB) to detect the presence of carbon dioxide.
CK-12 Foundation
Ck 12: Chemistry: Recognizing Chemical Reactions
[Free Registration/Login may be required to access all resource tools.] A tutorial full of explanations, videos, and review questions that covers chemical reaction and indicators of a chemical reaction.
Science Education Resource Center at Carleton College
Serc: Indicator Indi Gator
In this activity the learners use critical thinking skills to see how liquids will change the color of an indicator.
PBS
Pbs Learning Media: Acids and Bases: Cabbage Juice Indicator
In this video segment, the ZOOM cast demonstrates how to use cabbage juice to find out if a solution is an acid or a base.
Science Education Resource Center at Carleton College
Serc: Chemical Reactions: Investigating Exothermic and Endothermic Reactions
In this 9th grade physical science guided inquiry, students will work in pairs to discover the indicators of chemical reactions. Each pair of students is assigned either an exothermic or endothermic reaction. Based on their observations,...
Quizlet
Quizlet: 5 Indicators of a Chemical Change
This website provides five terms about chemical change for you to practice. Audio is included for each term. This is a great study tool for test preparations.
Other
The Science House: Cabbage Juice Indicator
In this lab experiment, students will use red cabbage as an indicator to test whether a substance is an acid or a base. Teacher's notes provide background information.
US Environmental Protection Agency
Epa: Making a Natural P H Indicator
At this site you will find a step by step process for making a natural pH indicator. One of the main materials you need to have on hand is a red cabbage.
BBC
Bbc: Gcse Bitesize: Types of Chemical Reactions
This lesson focuses chemical reactions using acidic and alkaline solutions, the pH scale which measures the acidity or alkalinity of a solution, and how to use a pH meter. A link to an assessment is also provided.
Other
Siemens Science Day: Earth Science: By All Indications
A hands-on science experiment where students test acidity levels by using red cabbage extract and learn the acid levels of known and unknown liquids.
TeachEngineering
Teach Engineering: Red Cabbage Chemistry
Students take advantage of the natural ability of red cabbage juice to perform as a pH indicator to test the pH of seven common household liquids. Then they evaluate the accuracy of the red cabbage indicator, by testing the pH of the...
BBC
Bbc: Gcse Bitesize: Types of Chemical Reactions
Bases are substances that can react with acids and neutralize them. Alkalis are bases that are soluble in water. The pH scale measures how acidic or alkaline a substance is. Substances with a pH lower than 7 are acidic, those with a pH...
Frostburg State University
General Chemistry Online: Water to Wine
The molecular basis of indicator color changes. Includes Chime structures for the acid and base forms of phenolphthalein, methyl orange, red cabbage indicator, and cyanidin diglucoside.
Other
Monell Chemical Senses Center: Areas of Research: Sensation and Perception
Overview of how chemical signals from animals mark territories, identify individuals, signify social rank, and indicate reproductive and health status.
American Chemical Society
Middle School Chemistry: Carbon Dioxide Can Make a Solution Acidic
Students explain that carbon dioxide from any source reacts chemically with water to form carbonic acid. They will also be able to use the color changes of universal indicator to monitor the changing pH of a solution during a chemical...
American Chemical Society
Inquiry in Action: Color Changes With Acids and Bases
In this lab activity, students will learn how red cabbage can be used as an indicator of an acid or base by looking at its color changes.
American Chemical Society
Inquiry in Action: Neutralizing Acids and Bases
A lab activity where students will neutralize and acidic solution with a base and a basic solution with an acid by using their knowledge of a red cabbage indicator. This site includes teacher and student instruction for the lab activity...
Other
The Science House: Invisible Ink
Guidelines for a simple lab demonstration using phenolphthalein, a chemical that changes color depending on whether it is in the presence of an acid or base.
Climate Literacy
Clean: Carbon Dioxide Sources and Sinks
In this lab activity, students use a chemical indicator (bromothymol blue) to detect the presence of carbon dioxide in animal and plant respiration and in the burning of fossil fuels and its absence in the products of plant...
Hunkins Experiments
Hunkin's Experiments: Color
Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do. This one...
US Environmental Protection Agency
Epa: Measuring P H Experiment
This is an activity that deals with acid rain. "This experiment will illustrate how to measure the approximate pH of chemicals in water using a pH indicator." It is easy to follow the comprehensive set of directions.
Science Education Resource Center at Carleton College
Serc: Magic Paper
This activity serves as an introduction to neutralization reactions. Students will observe that the goldenrod copy paper acts as an indicator changing colors and also that an acid can neutralize a base.
Science Buddies
Science Buddies: Measuring the Amount of Acid in Vinegar by Titration
There are many different types of vinegar that you can buy to use around the kitchen for cooking and pickling. The chemical compound that gives vinegar its tart taste and pungent smell is acetic acid. In this experiment you will work to...
ClassFlow
Class Flow: Heat
[Free Registration/Login Required] This flipchart investigates how heat is produced and the effects of heating and cooling and demonstrates how a change in temperature indicates a change in heat. Students will sequence objects according...