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- The liquid in each cup turned a different color during the reaction. Because substances react chemically in characteristic ways and the substances reacted differently, the substances in each cup must be different.
www.acs.org/middleschoolchemistry/lessonplans/chapter6/lesson8.html
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Jul 30, 2024 · The liquid in each cup turned a different color during the reaction. Because substances react chemically in characteristic ways and the substances reacted differently, the substances in each cup must be different.
- Chemical Reactions & Color Change
A pH or acid-base indicator is a compound that changes color...
- Chemical Reactions & Color Change
The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties. However, in a chemical reaction, a color change is usually an indicator that a reaction is occurring.
Sep 20, 2022 · There are four visual clues that indicate that a chemical reaction is likely occurring: A change of color occurs during the reaction. A gas is produced during the reaction. A solid product called a precipitate is produced in the reaction. A transfer of energy occurs as a result of the reaction.
- Objective
- Key Concepts
- NGSS Alignment
- Summary
- Evaluation
- Safety
- Clean-Up and Disposal
- Materials
- Teacher Preparation
- Activity Sheet
Students will be able to explain that if two substances cause turn a pH indicator different colors, they must be different substances. Students will be able to explain that the color that a substance turns a pH indicator is a characteristic property of that substance. Students will also be able to explain that different substances react in characte...
A pH or acid-base indicator is a compound that changes color depending on the pH of the substance that is added to it.Acids and bases make pH indicators turn different colors.Two substances that turn the same pH indicator different colors must be different substances.The color that a substance turns a pH indicator is a characteristic property of that substance.NGSS 5-PS1-3: Make observations and measurements to identify materials based on their properties.NGSS 5-PS1-4: Conduct an investigation to determine whether the mixing of two or more substances results in new substances.Students squeeze red cabbage leaves in water to make an acid-base indicator solution.Students add laundry detergent powder (a base) and cream of tartar (an acid) to the indicator and see that the two solids cause different color changes.Students recognize that a particular color change is a characteristic property of a substance and that a color change can also be used as evidence that a chemical reaction has occurred.Students will explore what happens during neutralization by using a base to neutralize an acid, and an acid to neutralize a base.Download the student activity sheet (PDF)and distribute one per student when specified in the activity. The activity sheet will serve as the Evaluate component of the 5-E lesson plan.
Make sure you and your students wear properly fitting safety goggles. Most generic or all-purpose solid laundry detergents contain 20–30% sodium carbonate by weight and may cause skin burns and eye irritation. The detergent powder may also be harmful if swallowed or inhaled. Avoid contact of laundry detergent powder with eyes and skin. Do not handl...
Remind students to wash their hands after completing the activity. All common household or classroom materials can be saved or disposed of in the usual manner.
Materials needed for each group
1. Red cabbage leaves 2. Cream of tartar 3. Powdered laundry detergent 4. Water 5. Zip-closing plastic bag (storage-grade, quart-size) 6. 5 Clear plastic cups 7. 2 Small cups 8. 2 Popsicle sticks 9. 1 Tablespoon 10. Permanent marker 11. White piece of paper 12. Measuring spoon (for Teacher Preparation)
Label two small cups Cream of Tartar and Detergent for each group. Place ¼ teaspoon of detergent and ¼ teaspoon of cream of tartar in their labeled cups.
Download the student activity sheet (PDF)and distribute one per student when specified in the activity.
Jul 3, 2019 · For example, color change experiments can show oxidation-reduction, pH changes, temperatures changes, exothermic and endothermic reactions, stoichiometry, and other important concepts. Colors associated with holidays are popular, such as red-green for Christmas, and orange-black for Halloween.
- Anne Marie Helmenstine, Ph.D.
Oct 8, 2021 · We might observe a change in temperature, the emission of light, a change in colour, a release of gas, or a change in the amount of reactants or products. All of these observations are useful when determining whether a chemical reaction has happened.
Nov 1, 2012 · A change in color is just one of several potential signs that a chemical reaction has occurred. Other potential signs include: Change in temperature. Heat is released or absorbed during the reaction. Formation of a gas. Gas bubbles are released during the reaction. Formation of a solid. A solid settles out of a liquid solution.
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