Behavior of Liquids and Solids Lab - Weebly



Behavior of Liquids and Solids LabBackground: Liquids and solids are different forms of matter. They have very different properties: Liquids are a moderately energetic form of matter where the particles have enough energy to move past one another, but not enough energy to escape (the IMF are fairly high). Solids are a low-energy form of matter. The particles in a solid can vibrate in place, but the IMF are so large that the particles are held in place. When a substance changes its physical state, this is known a as a phase change. Phase changes can be from solid liquid (melting), liquid solid (freezing), liquid vapor (vaporization, vapor liquid (condensation), solid vapor (sublimation) and vapor solid (deposition).Purpose: To explore and explain some behaviors of liquids and solids55149751460500Materials:Plastic petri dishBromothymol blue solution (BTB)WaterAqueous ammoniaIceVinegarRubbing alcoholGraph paper57277001460500Calcium chlorideDroppersSafety: INCLUDEPICTURE "" \* MERGEFORMATINET INCLUDEPICTURE "" \* MERGEFORMATINET INCLUDEPICTURE "" \* MERGEFORMATINET INCLUDEPICTURE "" \* MERGEFORMATINET INCLUDEPICTURE "" \* MERGEFORMATINET INCLUDEPICTURE "" \* MERGEFORMATINET INCLUDEPICTURE "" \* MERGEFORMATINET INCLUDEPICTURE "" \* MERGEFORMATINET Data Table:Ex. Substance A(place in petri dish)Substance B(place in dish, 3 cm from A)Substance C(place on top of dish)Observations1Drop of water----Ice cube2Drop of water----Drop of water3Drop of rubbing alcohol----Drop of water4Drop of waterPiece of CaCl2-----5-----Several Pieces of CaCl2Ice cube6Drop of waterDrop of rubbing alcohol-----7Drop of vinegarDrop of bromothymol blue-----8Drop of ammoniaDrop of bromothymol blue-----Procedure: In the following experiments, you will place substances labeled A and B inside the petri dish, and substances labeled C on top of the dish. Experiment 1: Place 1 drop of water (A) in the petri dish. Replace the cover and place a small piece of ice (B) on top of the cover. After a couple of minutes, observe the interior surface of the Petri dish cover and the contents of the dish. Record your observations. Clean and dry the petri dish.For Experiments 2-3, & 5: Repeat the steps for experiment 1 but use the substances listed in the table.For Experiments 4 & 6-8: Place the petri dish on the graph paper so you can place the drops 3 cm apart. Replace the cover of the dish and observe the contents.Analysis Questions:Explain your observations in Experiment 1 in terms of the behavior of liquids.How are your results of Experiment 1 similar to the water cycle and formation of rain?Why is ice not needed for cloud formation in Experiment 2?What differences do you observe about the behavior of rubbing alcohol in Experiment 3 and the behavior of the water in the previous experiments? Explain.In Experiment 4, what happens to solid calcium chloride in a humid environment?Propose an explanation for the lack of cloud formation in Experiment 5. What property of calcium chloride is observed?In Experiment 6, what happened to the size of the water drop over time? Propose an explanation for this.Vinegar is a solution of acetic acid and water. Bromothymol blue is an acid/base indicator. What happened in Experiment 7 when drops of each were placed 3 cm apart in a closed petri dish? Propose an explanation for your observations.What happened in Experiment 8 when a drop each of ammonia (aqueous solution of ammonium hydroxide) and bromothymol blue were placed 3 cm apart in a closed petri dish? Propose an explanation for your observations. What difference between vinegar and ammonia is observed? ................
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