Solutions have been made from samples of each container, and labelled A, B, C, and D. Use chemical tests to identify each solution. Be very careful not to cross contaminate the solutions! You should describe what you did at each stage in order to identify the compounds. Describe how you would test a sample of food to check for the presence of lipids, such as oils or fats. P5 First I collected four test tubes; in each test tube I purred the solution that has been labelled A, B, C, and D in the container.
EXPERIMENT: TECH 0704, Distillation, macroscale technique only, simple and fractional: Substitute a mixture of 25 mL ethanol and 25 mL water for the toluene/cyclohexane mixture. Record the temperature at 2 mL intervals of distillate. Use glass beads to pack the fractionating column. Construct a graph of temperature vs volume for each distillation in your lab notebook. Compare the efficiencies of the two distillation methods in your lab notebook.
Using the utility clamp, clamp the thermometer, attach the paper lid to the probe then move the probe close to the bottom but not touching the magnetic stirrer. Start the Logger Pro program on the computer. Open the file “13 Enthalpy” from the Advanced Chemistry with Vernier folder. Measure 50.0 mL of 2.0 M Hydrochloric acid, HCl, solution and pour into the styrofoam cup, make sure that the temperature probe is touching the solution. Measure 50.0 mL of 2.0 M Sodium Hydroxide, NaOH, solution but DO NOT ADD YET.
Form a hypothesis for why each affects seed germination. 3. To germinate the beans, place one folded paper towel, moistened but not soaking wet, into the 5 x 8in bag. Place 10 beans in a horizontal line on the paper towel (between the paper towel and bag). 4.
Physical Science Penny Lab Purpose The purpose of this lab is to see how the placement of the drops of green solution will affect how much the penny can hold up the green solution without dropping any solution on the table. Hypothesis I think that when we drop the green solution on the middle of the penny, the penny will be able to support more green solution because the green solution will have more room to spread out. Materials -25ml of mysterious green solution -Paper towel -A 150ml beaker -A penny -A pipette -A ruler Procedure 1) Place 25ml of the green mysterious solution into the beaker. 2) Squeeze the pipette in to the solution for three seconds and let go. 3) Place the penny tails up 4) Place the pipette over the letter “c” in “one cent” 5) Place the pipette 5 inches above the penny 6) Begin to slowly squeeze the solution out of the pipette, over the letter “c” while counting the numbers of drops until the solution spills out from the surface of the penny.
Procedure We will be using different food dyes, given in the lab materials as well as foods like M&ms and koolaid. First fill 50-ml of room temperature water in a the 50-ml beaker and as a pinch of salt. Stir until completely dissolved. Then take two sheets of filter paper and draw a horizontal line with a pencil across the filter about 1 cm from the bottom. Then draw nine small cross lines along the line you just made 1.5 cm apart.
For a catalase test, the bacterium must be placed onto a blood agar plate. This is done by aseptically transferring a loop full of the unknown broth bacterium onto the blood agar plate and incubated for about 24 hours. Once this is achieved the bacterium from the blood agar plate is used. To perform a catalase test first sterilize the inoculating loop with the Bunsen burner. Second, aseptically get an isolated colony of the unknown from the blood agar plate with the inoculating loop.
Brief Explanation This experiment will test the effect of caffeine on the growth of mung bean plants. By testing this, I can also prove the effect of caffeine on all other organisms. The experiment could go either way: the plants with caffeine could grow more or they could stop growing once I add the caffeine in to the equation. * Independent and Dependent Variables * The independent variables are the watering solutions which are water, caffeine solution, and coffee mixture. The constants are the size of the pot, the concentration of caffeine and coffee, the amount of sunlight, the temperature of the environment (which will remain at room temperature) and the amount of water added daily.
Thermal Insulating Materials: A Self-Directed Experiment In our most recent lab, we determined the specific heat of a solid and learned the relative heat properties of substances having different specific heats. For this self-directed lab, we will determine what makes the best coffee-cup calorimeter and then determine which of various common substances is the best thermal insulating material is. We must first understand that thermal energy flows between two samples of matter at different temperatures. In order to prevent heat from escaping, thermal insulating materials are required to minimize the heat transfer by reducing the transfer of heat between two objects in direct contact, and the transfer of heat by electromagnetic waves. For this experiment we will be using cups of: metal, ceramic, plastic, and Styrofoam for our calorimeters.
Hydration Number Matthew Brinkley and Taylor Thompson In this paper explaining the lab that my partner (Taylor Thompson) and I did on December 12, 2011 we will be measuring and finding the masses in grams of many different items which Mr. Hood has supplied us with. We have to see how to work a burner and how to use various lab equipment tools. Purpose: Determine the hydration number for Copper (II) Sulfate by heating the hydrated salt to drive off the water. The blue hydrated salt turns to a white/grey anhydrous powder.