Experiment 19 Part A 1. Press ON/OFF button 2. Press MAIN MENU F2 F1 3. Make and ice bath in a 150 mL beaker 4. Press CALIBRATE enter 0.0C when promted press ENTER insert temperature probe and swirl it around until the screen reads 0.0C press ENTER 5.
5. Shake and allow for the reaction to occur. 6. Measure the diameter of the balloon at 2 minute intervals then shake the flask again to further mix the contents. Results: SUGAR YEAST 5g Yeast - 20g Sugar 4.5 cm 5g Yeast - 20g Sugar 4.5 cm 5g Yeast -
Cellular Respiration Lab Cedric Olinger Hr. 3 Question/Purpose: Will temperature affect the rate of respiration on germinated plants? Hypothesis: If temperature is different, then the oxygen level in the chamber will gradually increase because the plant has turned all the available carbon dioxide into oxygen in the chamber. Controls and Variables: Independent Variable: Temperature Dependent Variable: Oxygen content Control Group: Non-Germinated Peas Controlled Variables: Sunlight, Number of peas, water, environment Experimental Variables: Temperature Materials Used: • 20 Green Peas (Non-Germinated) • 20 Green Peas (Germinated) • Oxygen gas sensor • Ice Cubes • Thermometer • 100 milliliter beakers • Petri Dish Procedure: 1. Collect the required materials as shown above from the teacher with your lab partner.
Hypothesis In this experiment, the rate of cellular respiration in the germinating peas will be higher than that of the glass beads; non-germinating peas; and seeds mixed with glass beads. Materials Safety goggles 3 mm of germinated seeds 3 mm of non germinated seeds 3 mm of glass beads 3 mm of plants seed with glass beads Thin-stemmed plastic dropping pipettes 40 microliter capillary tubes Absorbent and nonabsorbent cotton 15% solution of KOH, potassium hydroxide solution Tub of water Procedures Begin the experiment by
Carie-Ann Yauwelmong Instructor Kathy Hayes Chemistry Sec#1 31 January 2014 Objective: You will learn how to use a variety of scientific measuring tools to complete several measurements, calculations and conversions. Materials: Triple beam balance, meter ruler, 30cm ruler, tape measure, bathroom scales, thermometer, electric scales, 5 rock samples, 5 wooden blocks of different sizes, marble, 100ml graduated cylinder, water, burner, stand, gauze, beaker, scientific calculator and conversions. Procedure: Experiment 1: Triple Beam Balance * You need; Triple beam balance and 5 rock samples 1. Estimate the weight of the rock in grams and record this value in a table. This is your estimated weight (g).
Biology practical – Investigating fermentation 25/11/08 Research Question Which sugars cause yeast to respire anaerobically and produce the most CO2 out of glucose, fructose and lactose? Variables Independent The sugar solution used as a substrate for the yeast. Dependent The amount of carbon dioxide produced by the yeast in 5 minutes. Controlled Temperature of the water bath used to put the yeast in, yeast concentration (30%), sugar concentration (15%. ), the volumes of the yeast and sugar solutions (3cm3 each,), all apparatus that is used.
Title: An investigation on the amount of diffusion by osmosis over 24 hours in differing sucrose concentrations upon potato cubes. Abstract: The experiment was conducted to examine the rate and effect of diffusion by osmosis on potato pieces with different glucose concentrations over a course of 24 hours. The initial and final weight of the potato was weighed in mg. Five groups containing three 2x1cm3 potato cores. The five groups of three potatoes were placed into separate beakers of distilled water that contained different sucrose concentration percentages (0%, 25%, 50%, 75%, 100%) and then left over 24 hours in order for osmosis to have time to pass through the potatoes thick membrane. The final weighing of the potato cores weighed less than initially since the water is leaving the potato in order to evenly distribute itself amongst the sucrose.
After the effervescence, (15mL) of concentrated HCl was added drop wise to the solution. The mixture was then heated for 15 minutes in a boiling water bath. In two separate small beakers (20mL) of distilled water was placed in one and (20mL) of 6M HCl in the other. Both beakers were placed into an ice bath. After heating, the mixture was cooled to room temperature and filtered by vacuum filtration into a fritted funnel to yield a purple product.
We measured the amount of water we used and calculated the pore space as well as the percentage of pore space. For the Soil Permeability lab we took a piece of filter paper and folded it into a funnel. We then filled the funnel with 40ml of soil and poured 100ml of distilled water into the funnel and allowed it to filter into a beaker for about 10 minutes. Last we recorded the volume of the water that collected into the beaker to see how much water filtered through the soil in order to see how permeable the soil was. For the pH, phosphorous, nitrogen and potassium lab we used the soil test kit to determine the different levels.
4. Write down the data in the notebook for further use. Cold water (0°C) : 1. Add water to the beaker filled with ice and wait for 5 minutes. 2.