4:39 4. Fill cup \#1 and \#2 with 1/2 cup of cold water. Fill cup \#3 with 1/2 cup warm water. 5. Stir the contents of cups \#2 and \#3 to help dissolve the sugar (it may not all dissolve, that's fine) 6. Now add one packet of yeast to each cup and gently stir again to mix L7.1 Experimental Variables Unanswered 2 attempts left Open L7.1 Experimental Variables Unanswered \( \cdot 2 \) attempts left In your yeast experimentation set up, which of the following were the control variables? (select all that apply) A Amount of yeast and water B Temperature and amount of water C Amount of sugar Submit 1/22
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Table 1: Yeast Fermentation Data Tube Initial Gas Height (mm) Final Gas Height (mm) Net Change Post-Lab Questions Include your hypothesis from Step 1 here. Be sure to include at least one piece of supporting reasoning in your hypothesis to support your predictions. Did you notice a difference in the rate of respiration between the various sugars? Does artificial sugar provide a good starting material for fermentation?
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INTRODUCTION: In this lab, you will make qualitative observations of perhaps the most famous reaction in all of chemistry: the reaction between baking soda and vinegar HC2H3O2 (aq) + NaHCO3 (s) → NaC2H3O2 (aq) + CO2 (g) + H2O (l) In this lab we will determine the signs of ΔH, ΔS, and ΔG, as well as a variety of other aspects of this fascinating reaction. MATERIALS: ● Vinegar of any kind (white, apple cider, rice, etc.) - you will need perhaps ½ cup. ● If vinegar is not available, lemon juice will work as well ● Baking Soda - about two tablespoons will do ● A container like a plastic cup or a glass. The thinner the walls of the container, the better. PROCEDURE: 1. Pour the vinegar into the cup. If the vinegar has been in the fridge, let it warm to room temperature. 2. Feel the sides of the cup. 3. Hold the cup over the sink (just in case!) 4. Add the baking soda to the cup. 5. Observe the liquid. Record your observations. 6. Feel the sides of the cup. Record your observations. 7. Pour the cup down the sink. That's it! 8. When typing this lab report, subscripts and superscripts must be used correctly. Failure to use subscripts and superscripts when necessary will result in a loss of points.
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