| |(a) Label two boiling tubes A and B and place a known weight or number of living organisms in A. | | |Place an equal quantity of dead or non-living material in B. | | |Cover the mouth of each tube with a piece of aluminium foil. Press firmly into place round the rim| | |of the tube.
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Other variables to be controlled Other equipment Method and outcome Temperature Volume of solutions Stress of Daphnia Size of Daphnia Time of acclimatisation Microscope‚ counter‚ cavity slide‚ dropping pipettes‚ stop clock‚ distilled water‚ test tubes‚ stop clock Method: Remove 1 Daphnia and place in cavity slide. Remove pond water and replace with distilled water. Leave for 5mins to acclimatise then observe & count heart rate under microscope for 30s‚ multiply number by 2 to calculate beats/min
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suspension 10 test tubes 4 beakers Thermometers Measuring cylinders Test tube pegs Test tube rack Bunsen burner Tripod Gauze mat Ice cubes/refrigerated water Ruler Safety goggles Pipettes Method: 1. Set up equipment as follows: Beaker Temperature (˚C) 6% Hydrogen peroxide (mL) Liver suspension (mL) 1 10 3 2 10 3 3 10 3 4 37 10 3 5 50 10 3 2. Fill beaker 1 with 250mL of ice cubes and tap water and record temperature. 3. Place a pair of test tubes‚ one of
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Equipment: 20 ml of 0.00100 molL-1 potassium permanganate 20 ml distilled water 6 identical test tubes 1 Test tube rack 1 plastic pipette 10 ml measuring cylinder Photometer Method: 1. Measure 5 ml of potassium permanganate with the measuring cylinder‚ place this into the 1st test tube. Then measure 2 ml of distilled water with a plastic pipette‚ also place in the 1st test tube. Stir the solution gently with the pipette to ensure that the potassium permanganate is evenly diffused
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Guidelines for writing laboratory reports Laboratory reports should be written according to the format below (failure to do so will result in marks being deducted): Formatting Font Type: Times Roman Font size: 12 Spacing: 1.5‚ justified Pages : 5 (minimum) - 10 (maximum) [pages must be numbered] Title page You are required to use the lab report submission page available on the LMS and are to include these details: lab no.‚ title of experiment‚ students’ names and ID‚ date of experiment as well
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distilled water‚ glycerin‚ test tubes‚ nails‚ test tube rack‚ graduated cylinders‚ tongs‚ scoopula‚ erasable marker and parafilm. 3. With the erasable marker‚ label the ten test tubes from 1 to 10. 4. For Test Tube 1‚ drop an iron nail in it without adding anything else. Place the test tube into the to-be-heated rack (50⁰F) located on the side bench and proceed to the next step. 5. For Test Tube 2‚ drop an iron nail in it without adding anything else. Place the test tube into the to-be-cooled rack
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the calcium carbide 3 large test tubes of similar size with stoppers (held in large empty beaker) Wooden splint and lit candle Large beaker (500mL to 1L) half full of water Pre-lab Exercise: 1. In this lab we will produce acetylene by placing calcium carbide (CaC2) in water. Write the chemical formula for the reaction between calcium carbide and water knowing that the product is acetylene (C2H2). 2. The acetylene in this lab will be collected in a test tube and burned. Write the balanced
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find the rate of reaction of the decomposition of hydrogen peroxide. * Control Variable- 1mL of yeast (catalyst) is being used in every trial. The volume of H2O2 is always 4 mL‚ even though the concentration changes and the sizes and type of test tube was the same because it can change the pressure. * Independent Variable- Concentration of H2O2 (M) and the temperature (°C) * Dependent Variable- The rate of reaction of the decomposition of hydrogen peroxide → rate of reaction = ∆ Pressure
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EQUIPMENT AND REAGENTS 1. EQUIPMENTThirty test tubes One test tube rack Two test tube holders Two spatulas Three 250 mL beakers One stirring rodOne medicine dropper IV. EXPERIMENTAL PROCEDURE 1. REACTIONS OF Cu2 - Prepare 3 test tubes‚ 10 drops of 0.5 M CuSO4 are added into each one-10 drops of the following reagents are added into the tubes 2 M NaOH 2 M NH4OH 0.5 M K4Fe(CN)6. - Record your observations. 2. REACTIONS OF SILVER HALIDES - Prepare 3 test tubes‚ 10 drops of 0.5 M KCl‚ 0.5 M KBr‚ and
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hand‚ decrease in salt concentration results in a hypertonic solution where the mass of the potato decreases due to the movement of water outside the cell. MATERIALS: Potato Forceps Stopwatch Scalpel Test tubes Knife Mass balance Graduated cylinder ruler salt solution test tube rack PROCEDURE: 1. Cut 18 potato cores from the same potato using a knife and place them onto the lab bench. Using a scalpel and ruler (calibrated in millimeters) cut the cores into 50 mm lengths‚ with care
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