For safety reasons a heat-proof tile was placed under the watch glass and goggles were used. The fuel was lighted with a splint and not the Bunsen burner, and the experiment area was completely clear for space. For accuracy, the maximum temperature of the water was measured. The fuel was not left for a long time as the water would evaporate and the bottom of the test tube was cleaned in order not to interfere with the heating process. To make it a fair test, the time taken of different fuels to burn could be measured.
A substitute we used the thermometer. Methods Trial Test In a 100ml beaker 30mls of water was placed the temperature of the water was recorded. 1 teaspoon of Ammonium Nitrate was added to the water and stirred until dissolved. The temperature was then recorded again. This was to see the difference between the initial temperature and the final temperature.
Materials: -Hot Plate -Two (2) Beakers -Water -Metal Objects -Two (2) Thermometers -Pencil -Paper -Calculator Design: A hot plate is acquired and plugged in and if left to warm up. Fill two beakers with 0.075kg of water and record the temperature using a thermometer and record it. Place one of the beakers onto the hot plate and drop one of the metal objects in. Wait for the water to boil and wait two minutes. Take the object out of the water and drop it into the other beaker.
Investigating Enthalpy Change During this investigation I will be burning a selection of different alcohol's to heat a container of water. I will be burning four alcohols, methanol, ethanol, propanol and butanol. The aim of the experiment is to find out how much energy is produced when these alcohols are burnt and to see if there's a relation between how many, and how strong the bonds are between molecules in the elements burnt, and how quickly the water is heated up. To put it simply, we will see if the enthalpy would increase per extra CHï€‡ added Any form of burning is an exothermic reaction; this means that heat is given out as a result. This means that the reactants energy is higher than that of the product.
tie back long hair, use goggles and make sure the room is well ventilated. Secondly I will set out the apparatus and get all the equipment from the list (shown on the previous page). Using the measuring cylinder, I will put 20cm3 of distilled water into a boiling tube,) I then heat the water using the first fuel until it rises to 100°C, noting the time every 10°C starting from 20°C.
Third, heat the oil until the stearic acid dissolves altogether. Fourth, cool the oil and stearic acid mixture to 40-45 °C. You can determine the temperature with the use of the thermometer. While waiting for the mixture to cool, you may wash your graduated cylinder. Fifth, add 32.0 mL of 32.5% sodium hydroxide (NaOH) or lye solution to the above mixture using a graduated cylinder.
Variables Ways to control variables Independent : Temperature of water used Heat the water with different temperature and measure it using thermometer which are 5˚C , 28˚C, 40˚C, 60˚C and 80˚C Dependent : Rate of reaction between Eno and water Measure the time taken for the lid of plastic container to pop out using stopwatch. Calculate the rate of reaction by using the formula : rate= 1/t Controlled : Volume of water Amount of Eno used Size of plastic container. Measure the amount of water using 20 cm3 measuring cylinder Weigh and fix the amount of Eno used that is 1g using electronic weighing balance Use the same size of plastic container which is 40 cm3 in volume. Table 1 shows the variables and ways to control all the variables of the experiment Materials and Apparatus Material and apparatus Quantity Eno (5.00 ± 0.01 g) Plastic container 5 Water (100.0 ±
Put a spatula measure of sodium hydro carbonate in a test tube with 40ml cold tap water and stir. This provides the plant with enough CO2 to photosynthesise. 5. Fill a 1000ml beaker with 700ml water and put the test tube into it. This will act as heat shield from the lamp, so that the temperature will not affect the experiment.
At the end of three minutes the beaker containing 100 ml of water was placed on hot plate. The water was allowed to heat to 100 °C which would effectively stop any bacterial growth in water. Thermometer was used to measure the temperature of water. 2.3g of Agar powder, measured by using a mass scale, was added to the water while it was being heated. The water was stirred with a rod to make it sure that the agar mixes well and forms a homogenous solution.
The Effect of Temperature on the Action of Peroxidase Enzyme Aim To find the effect of temperature on an enzyme in this case peroxidase, by studying it decomposing hydrogen peroxide. Planning I am measuring the amount of gas given off in the reaction. By collecting this figure I can determine the rate of reaction. If I know the rate of reaction I can find out what temperature peroxidase works best at. Equipment · Trough · Clamp · 100ml measuring cylinder · Stop clock · 10ml measuring cylinder · Delivery tubes · Bung · Conical flask Variables Change The temperature of the reactants: 60 50 40 30 20 10 Control Amount of peroxidase (10ml) Amount of hydrogen peroxide (20ml) Length of experiment (2min) Time between measurements (15sec) Equipment used Safety I will keep my safety goggles on at all times to prevent painful eye injury.