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What to Do. Set up a test area with the cups and spoons in an area where spills are not an issue, such as the kitchen table. Bring your test liquids to the test area. Pour a small amount of two different liquids together into one cup and mix them together with a clean spoon. What happens to the liquids?
- Objective
- Key Concepts
- NGSS Alignment
- Summary
- Evaluation
- Safety
- Clean-Up and Disposal
- Materials For Teacher Preparation
- Teacher Preparation
- Coloring The Liquids
Students will be able to plan and carry out an investigation to identify a liquid based on how it interacts with water. Students will also be able to explain, on a molecular level, why different liquids act differently when mixed with water.
The way a liquid mixes with water is a characteristic property of the liquid and can be used to identify the liquid.For a “mixing test” to be fair, the same amount of each liquid should be mixed in the same way.The different atoms and molecules that make up a liquid cause it to mix with water in a characteristic way.NGSS 5-PS1-3: Make observations and measurements to identify materials based on their properties.NGSS 5-PS1-1: Develop a model to describe that matter is made of particles too small to be seen.Students will test the same liquids as in Lesson 2.2 - water, salt water, alcohol, and detergent solution. But in this activity, all the liquids tested are colored yellow.Students will mix these liquids with water that has been colored blue to see if the liquids have a characteristic way of mixing with water.Students will use their results to identify an unknown liquid that is the same as one of the known yellow liquids. The unknown in this lesson is salt water.Download the student activity sheet 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. Isopropyl alcohol is flammable. Keep it away from heat, sparks, open flames, and hot surfaces. Isopropyl alcohol is also irritating to eyes and skin, and may cause drowsiness or dizziness if inhaled. Work with isopropyl alcohol in a well-ventilated room. Read and follow all warni...
Remind students to wash their hands after completing the activity. Isopropyl alcohol should be disposed of according to local regulations. All other common household or classroom materials can be saved or disposed of in the usual manner.
WaterIsopropyl “rubbing” alcohol (70%)Clear colorless detergentSaltReuse labeled cups and droppers from Lesson 2.2 If you have liquids left from Lesson 2.2, you can use them. If not, use the steps below to make new liquids. Use a permanent marker to label five small cups Water, Salt Water,Alcohol, Detergent, and Unknown. Make solutions for the class according to the following procedure. These instructions make 1/4...
Add 2 drops of yellow food coloring to each liquid described above.Place about 1 teaspoon of each yellow solution into its labeled cup. Use salt water for the unknown.Add 4 drops of blue food coloring to 1/2 cup of tap water.Label one small cup waterfor each group.Add one tablespoon of liquid 1 into the mini cup. (For mixture 1, liquid 1 is baby oil.) Clean the tablespoon with water and dish soap and let it dry. Carefully add one tablespoon of liquid 2 into the same mini cup, as shown in Figure 3. Pour the liquid gently on top of the other and do not stir the liquids yet.
Dissolve 10 mg of a solid (or 1 drop of a liquid) unknown in the minimum amount of bis (2-ethoxyethyl)ether required to give a clear solution (less than 1 mL). Add the unknown solution dropwise, with agitation, to the first test tube. Mix vigorously and allow the solution to stand. Do the same for the known compound.
Procedure. Use a pencil to label the wax paper W, SW, A, and D for water, salt water, alcohol, and detergent. Mark the paper in the middle with U for the unknown. Use a dropper to get a small amount of each liquid. At the same time, gently squeeze 1 drop of each liquid onto its labeled area of the wax paper.
Teacher preparation: Use a permanent marker to label 3 small plastic cups for each group: Water, Mineral Oil, and Corn syrup. Place about 1 teaspoon of liquid in each labeled cup. Label one extra set of cups for you to use in the Engage and the Extend part of the lesson. In your cups, fill each about halfway with the labeled liquid.
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Apr 26, 2018 · Red Cabbage Juice. One interesting method of testing the pH of a liquid uses red cabbage juice as a pH indicator. When the cabbage juice is mixed with different liquids, the solution changes color thanks to a pigment in red cabbage called flavin – an anthocyanin. If the color changes to pink, the pH is 1 to 2. If the color becomes dark red ...
