Obtain an Erlenmeyer flask that has a vacuum opening and attach the vacuum tube to it 8. Insert funnel and rinse the funnel with distilled water 9. Turn vacuum on and pour the pink solution into the Erlenmeyer flask, the precipitate should stay on top of the filter 10. Rinse the beaker out until all residue is gone 11. Try to rinse the precipitate in the funnel until the pink color is gone 12.
If contact was liquefied gas thaw the frozen parts with lukewarm water. If it was a burn cool infected area with cold water but do not remove clothing adhering to the skin. 1005- Ammonia; toxic and corrosive gas. Isolate any spill at least 100 meters in all directions. first aide move victim to fresh air, administer o2, DO NOT use
Over six hundred species of yeast have been discovered; however, cooking yeast is made from the genus and species of yeast called saccharomyces cerevisiae. Yeast can be produced from a single yeast cell. The first step uses a strong microscope to select one healthy yeast cell. The cell is planted in a container, which contains everything needed to make yeast grow. Then the yeast cell reproduces, by multiplying itself.
BE READY WITH THE STOPWATCH. Record the time in the data table. Room Temperature Water: Fill beaker with 80mL of water. Use thermometer to record the temperature Drop Alka-Seltzer tablet in water. Measure the time it takes to completely dissolve.
Measure 50.0 mL of 2.0 M Sodium Hydroxide, NaOH, solution but DO NOT ADD YET. Click the Collect button to get the initial temperature of the HCl solution. After the first four readings have been recorded at the same temperature, add the NaOH solution. Make sure you have lowered the paper lid to keep from liquid coming out of the cup. Turn the Stirrer on, at a slow to medium speed.
Then measure the final mass of the fuel using a mass scale. Record all the results. Repeat all the steps again, but change fuel (Cheetos, half a cashew nut, wax candle and ethanol) every three trials. Data Collection and Processing: Fuel | Trials | Mass H2O (ml) ±1 | Change in Water Temperature (°C) | Mass Loss of Fuel (g) ±0.02 | Energy Produced (J) | Energy Produced per grams (J/g) | Cashew | T1 | 200 | 5 | 0.31 | 4180 | 13483.87
Use 10 mL of the stock and dilute to 1 L with distilled water. This gives a 0.01 M solution. 7. Yeast suspension: Add 1 package of dry yeast to 250 mL of 1% sodium bicarbonate solution. Mix thoroughly and swirl when dispensing.
Experiment 2 Time | Observations | 5 minutes | Bubbled like sugar | Once salt water was added | Turned soapy white and thick | Equation: METHOD 1) Put 2 cm3 of castor oil into a 250 cm3 beaker and add 10 cm3 of 5mol.dm-3 sodium hydroxide from a measuring cylinder. (Take care when measuring this out and adding it to the beaker to avoid any drips and spills.) 2) Heat the mixture gently over a tripod and gauze, STIRRING CONSTANTLY with a glass rod (otherwise the mixture erupts). Allow to simmer (boil gently) for 5 minutes. Steady the beaker using
Put exactly 5.0 mL of water in the 10.0 mL graduated cylinder. Record this volume in your data table (10.0 mL). Label the first pipet "Acid." To calibrate the pipet, fill it with LIU-2 water. Holding the pipet vertically, add 20 drops of water to the cylinder.
Volume of distilled water * 9ml of distilled water measured using measuring cylinder are poured in each test tube to dilute 1ml of yeast suspension to make different dilutions of yeast suspension 2. Type of cell used in the experiment * 1ml of yeast cells is used in each test tube in this experiment to make different dilutions 3. The size of magnification of objective lens used * Magnification of 10× is used to observe yeast cells in the haemocytometer 4. The temperature of surroundings * The experiment is carried out in the room temperature which is 28◦C 5. The number of squares on haemocytometer used for yeast cells counting * Yeast cells are counted in 4 sets of primary squares on haemocytometer Apparatus and Materials : Apparatus | Quantity (s) | Microscope | 1 | Haemocytometer and Cover Slip | 1 | Hand Tally Counter | 1 | Test tube | 6 | 10 ml measuring cylinder | 2 | Dropper | 1 | Capillary Tube |