A person should also make sure to wear long sleeves, closed toed shoes, and long pants to avoid contact with the skin. 3. Define the B. Pt of liquids and M. Pt of solids. Why is it important to determine these physical properties of a substance? The melting point of a solid is the point at which a solid becomes a liquid with standard atmospheric pressure. The boiling point of a liquid is the temperature at which the vapor pressure of a liquid equals the external pressure. It is important to know these characteristics of a substance so that you can handle them in the correct manner.
Procedure (4pt) (Write the procedure in your own words after you read the manual) 1. B. Pt: (Part One) •At the beginning of the experiemtn make sure you gather all necessary materials, i. e. , spoon, alcohol, rubber bands, and a sheet of paper. When doing an experiement, be sure to set up a data table to record all results. In this case a data section has been provided by the instructor.
Then, you should complete the assembly, exactly like the illustration provided by the lab manual. •Put 1 mL of alcohol in the test tube. Then you should take the thermometer and place it side by side with the test tube. Make sure that the bulb of the thermometer is even with the bottom of the test tube. Then use a rubber band to attach them together. Then insert an inverted closed end capillary tube into the test tube. (Part Two) •Then make a water bath assembly exactly like the illustration provided in the lab manual. Then take a 100 mL beaker and fill it half way with warm tap water. Then you should take the entire test tube assembly and put it into the water bath, so that the alcohol surface level is below the water in the beaker surface level. Then set up your burner stand, and place the beaker on top of it. •Light the burner fuel and put it beneath the stand. Carefully stir, to make sure everything heats evenly. Watch and wait for there to be a continuous boil and streams of bubbles coming from the water bath. •Now, you want to put out the fire by putting the cap on the burner fuel slowly and carefully. This will eliminate the oxygen to the fire. Then observe the boiling liquid from the capillary tube.
Materials and Methods The first experiment involved examining the effect of temperature on aerobic respiration of germinated pea seeds. The students testing the effect of temperature, will be divided into two groups. The first group is Student Pair A. They will test the effect of 10 C, 20 C and 30 C temperatures on pea respiration rate.The second group is Student Pair B. They will test the effect ...
Once you notice the stream slowing down, measure the temperature as you see the last bubble from the liquid. Record result in data table provided. •Now, you should repeat all previous steps two more times, and record results. The published boiling point of alcohol is 82. 4 degrees Celsius. Calculate the error between your results and the published boiling point. 2. M. Pt: •Make sure you have on gloves before moving on to this step. Insert the powdered acetamide into the open end of the 2nd capillary tube. You can do this by slowly and carefully pushing the tube into the powder acetamide. Now, make sure you get all the acetamide at the bottom of the tube by gently tapping the capillary tube. You want it to occupy at least 1-2mm at the closed end of the capillary tube.
Then you should take the thermometer and place it side by side with the test tube. Make sure that the bulb of the thermometer is even with the bottom of the test tube. Then use a rubber band to attach them together. •Then make a water bath assembly exactly like the illustration provided in the lab manual. Then take a 100 mL beaker and fill it half way with warm tap water. Then you should take the entire test tube assembly and put it into the water bath, so that the acetamide level is below the water in the beaker surface level.
There are many reasons why we need to treat our water, and there are also many different ways we can treat our water. Water is very important to our survival. Regulations are set so that our water is healthy for us to drink. Without those regulations there could be things in our water to cause us to be sick. Some problems in parts of the country are heavy metals. One of the best ways to see if you ...
Then set up your burner stand, and place the beaker on top of it. •Light the burner fuel and put it beneath the stand. Carefully stir, to make sure everything heats evenly. Make sure you are observing the powdered acetamide. At the point where the acetamide is completely melted, extinguish fire & record results in data table provided. Extinguish the fire exactly how it was stated in the previous section of the experiment. Let the acetamide cool and recyrstalize. Then repeat procedure two more times, making sure to record results. The published melting point of acetamide is 81 degrees Celsius. Compare your results with the one published and calculate the percent of error.