3. Place a dot of ink near the bottom of each strip. Use a pencil to identify which strip belongs to which pen. 4. Poke a pencil through one of the loops you just made.
2. Write your answers for the multiple-choice questions on the computer scan-sheet with a pencil. For Part II, write all your answers on this exam. Do not use additional booklets. 3.
General Certificate of Education Advanced Level Examination June 2013 Geography Unit 3 GEOG3 Contemporary Geographical Issues Friday 7 June 2013 1.30 pm to 4.00 pm For this paper you must have: l an AQA 12-page answer book. You may use a calculator. Time allowed l 2 hours 30 minutes Instructions l Use black ink or black ball-point pen. Pencil should only be used for drawing. l Write the information required on the front of your answer book.
Materials: 1 rectangular container 1 grease pencil 4 petri dishes 4 pieces of filter paper or paper towel 40 radish seeds (10 per petri dish) 1 paper plate Tweezers 100 mL beaker Stirring Stick Salt (1g, 2g and 3g)-measured out for you Dropper Procedure: (Don’t forget to take notes in your lab notebook. Keep a detailed description of every step you take so that someone else could accurately and precisely reproduce your results). See Lab Report Format for how your final Lab Report should look. 1. Determine what your group’s hypothesis will be and write it as an “if, then” statement on your lab report.
The dichloromethane is then separated from the mixture in the rotary evaporator. Figure 1: The structure of caffeine is very similar to those of purine bases (adenine and guanine) in DNA, therefore caffeine is a good substance to practice on for dealing with nucleic acids. Procedure Approximately 10g of tealeaves, CaCO3 (4.8g, 0.048 mol) and deionised H2O (100mL) is added into a beaker and boiled for 15 minutes. The mixture is then cooled to 20˚C and is filtrated using a Buchner funnel (vacuum filtration). The extraction process is when a solvent, dichloromethane (15mL) is added to the filtrate in a separatory funnel; the mixture is gently swirled together 3 times, and stopcock is released in between to vent the funnel.
Everything you need to know to create the box will be included in the following paragraphs. The very first step is to grab two pieces of paper, a ruler, a pair of scissors, and a pencil. Then you make four boxes that are five by four inches and two that are three and one fourths by four inches. After you have drawn them, you cut them out. When you are done, you are ready for the second step.
DNA Extraction Aim: To extract DNA from a carrot using house hold products. Method: * Step 1 – Pour 60 ml (¼ cup) of clear alcohol into a glass. Place the glass into the bowl of iced water to chill, then set aside. * Step 2 – Pour 120 ml (½ cup) of tap/distilled water into the measuring cup with the salt. Add 30 ml (2 tablespoons) of clear detergent and mix carefully until the salt is dissolved.
Next, get 2.00 grams of MgSO4 and combine it with the paste. Place pieces of wool into the neck of a funnel and place the funnel over a beaker. Mix 15 mL of 50/50% into the beaker, stirring to get a liquid from the paste. Then, pour just the liquid into the funnel to filter it out. Do this one more time the exact same, and then a third time using only 10 mL of the mixture.
Then place the pint-sized Ziploc bag into the gallon sized Ziploc bag and seal carefully. Finally shake the bags until the mixture becomes ice cream, which takes about five minutes. Take the pint sized bag out of the gallon sized bag, open and enjoy. If you prefer another flavor besides vanilla add one fourth teaspoon of cocoa powder instead of one fourth teaspoon of vanilla to the mixture. Follow the rest of the recipe as directed.
Gravimetric Determination of Sulfate Purpose The purpose of this lab is to determine the percentage of sulfate in the hydrate by precipitating the sulfate as barium sulfate. Materials Filler paper Sodium sulfate Graduated cylinder Bunsen burner Watch glass Beakers (250 mL, 400 mL) Rubber bulb Graduated pipette Beaker tongs Funnel Filter Paper Sodium Sulfate Drying oven Wash bottle Stirring rod Silver nitrate Hydrochloric acid Distilled water Small test tube Procedures First, .4861 grams of sodium sulfate was placed into a clean 400mL beaker. Exactly 200mL of water and 1mL of HCl was added to the same beaker. A watch glass was placed on the beaker and the solution was heated using the Bunsen burner to a gentle boil. The watch glass was removed with the beaker tongs.