over come attraction from the chemical for the absorbent layer and move that chemical in a given period of time. Materials Food Coloring (solute) Ethanol‚ Acetone‚ Tap Water‚ Distilled Water(solvents) Pencil Ruler Scissors Filter Paper Petri Dish Variables Independent: Type of chromatography solvent Dependent: Retention in paper chromatography Controlled: Type of Chromatography paper Size of spot Thickness of Chromatography Substance tested
Premium Solvent Chromatography Thin layer chromatography
crystallizes as yellow hexagonal platelets. Source: http://www.britannica.com/EBchecked/topic/333615/lead-iodide Apparatus: • 1 measuring cylinder (50cm3) • 1 weighing scale • 1 conical flask • 1 filter paper • 1 funnel • 2 beakers • 1 petri dish • 1 oven Chemicals: • Solid potassium iodide (KI) • 0.1 M lead nitrate [Pb(NO3)2] Risk Assessment: 1. Wear safety glasses to prevent lead iodide entering your eye. 2. Wear rubber gloves while handling the lead iodide to avoid skin contact
Premium Mass
to find the molarity where the mass does not change. No net change in weight indicates that there has been no net gain or loss of water. This is a means of indirectly finding the osmolarity of the cells themselves. Apparatus 1 large potato Petri dish 7 x 250 ml beakers (disposable cups may be substituted) sucrose solutions: 0.1‚ 0.2‚ 0.3‚ 0.4‚ 0.5‚ 0.6 molar marker razor blade/scalpel forceps cork borer balance (2dp) distilled water paper towels ruler (30 cm) Method 1
Premium Towel Paper towel Laboratory glassware
Abstract This study was undertaken to determine the relationship of different wavelengths of light and the rate of photosynthesis in spinach leafs. The rate of photosynthesis was measured every five min under light colors of white‚ green‚ red‚ blue and yellow under a light intensity of 2000 lux. The rate of photosynthesis was measured by the spinach disk method in which we replaced the air from the disks with sodium bicarbonate using a vacuum. Under photosynthesis‚ oxygen‚ a product of photosynthesis
Free Photosynthesis Chlorophyll
In 1914‚ during the Second World War‚ soldiers were dying like flies with massive numbers of dead at over 10 million. Automatic rifles and artillery fire were no respecters of person‚ nor was chemical warfare‚ no matter what side you were fighting on. If a bullet didn’t kill a soldier‚ it was almost a death sentence if he was wounded in battle‚ no matter how minor the wound. This death sentence was caused by wound infections‚ and the doctors in the field hospitals were working fervently to save lives
Premium World War II World War I Medicine
manner that was similar to the method of amplexus males use in order to release the eggs. The released eggs were placed in a petri dish where they were to be fertilized by the sperm of a male frog‚ who had donated his life prior to the running of the IVF treatment. In order to fertilize the eggs‚ the testis was diced into a small piece and then was moved around the petri dish touching every egg present in hopes of fertilizing each one. The eggs were then left for five minutes before adding a simple
Premium Pregnancy In vitro fertilisation Preimplantation genetic diagnosis
been slightly different due to us not being able to record the number of cells present on the petri dish clearly. This may have been due to the microscope not having a higher resolution thus affecting the accuracy of the results being obtained. Furthermore‚ the group MRSA also did the same practical but they used pH 2. The results that they obtained were that there were 45 cells present on the petri dish after five days. MRSA also obtained a value of 36000000 per litre. Bacteria grow by binary fission
Premium Chemistry Experiment Science
Practical Assessment 2 – The effect of substrate concentration on the rate of enzyme activity of Catalase Aim To investigate the effect of substrate concentration (manipulated by increasing concentration of hydrogen peroxide) on the rate of enzyme activity of catalase‚ produced by liver cells‚ on the decomposition of hydrogen peroxide. Introduction Enzymes are biological catalysts that increase the rates of reactions. In an enzyme-catalyzed reaction‚ the substrate binds to the active site
Premium Hydrogen peroxide Enzyme Oxygen
Purpose: The purpose of doing this lab was to observe the regenerative patterns of planaria cells after a portion of their bodies was cut off. Background: 1. A blastema is a group of cells that forms at the site of a wound that eventually turns into the missing parts of a planaria. 2. Planaria fission occurs when a planaria is missing body parts. The organism attaches its tail-end to the ground and pulls itself forward using its head-end in order to tear itself into two parts. Then‚ each of these
Premium
What we are going to test on. Petri dishes- Transparent glass cylinder which holds 100 mL of liquid. Used for holding seeds. Paper towels- Corse paper which was greyish in color. Used for putting seeds on and cleaning up messes. Water- Transparent liquid with no taste‚ odour
Premium Plant Seed Plant morphology