Unit Name: Analysis at Work Unit Number: G621 Assignment Title: Finding the Percentage of Copper in a Brass Alloy Assignment: G620 Sample Assignment C Date Set: Due Date: Assessment Objective(s): AO3 Vocational Brief: Brass is an alloy of copper and zinc. This alloy has many uses ranging from coinage to non-ferrous fittings on ships. Many domestic taps use brass where contact with water occurs. You are provided with a sample of brass which is about 150 years old and you are
Premium Aluminium Chemistry Chemical element
find the optimum concentration for maximum absorbance. C = A/ ε Methods: The two reagents used are Bromophenol blue and Methyly orange. Experiment 1: 1 Set up the colorimeter at 400nm‚ measure the absorbance of both reagents against distilled water‚ this will be used as a blank (make sure to zero the colorimeter after each interval) 2 Repeat this procedure at 20nm from 420nm to 700nm 3 After getting a range of results make further readings in smaller intervals to precisely locate
Premium Absorbance Light Electromagnetic radiation
What is the Effect of the Colour of Light on the Rate of Photosynthesis? By Amelia Rowan‚ 12SDa Aim To discover whether the colour of the light source has any effect on the rate of photosynthesis of a sample of algae. Hypothesis It was predicted that the colour of the light source would have a very slight effect on the rate of photosynthesis. It was further predicted that when the sample was placed under the green light‚ the rate of photosynthesis would be the lowest. This hypothesis was arrived
Premium
FeSCN2+ Kc = [FeSCN2+]/{[Fe3+][SCN-]} 3) Objectives: To determine the equilibrium constant; Kc of the reaction between Fe3+ and SCN- ions 4) Materials: Computer‚ Vernier computer interface‚ Logger Pro‚ Vernier colorimeter‚ 1plastic cuvette‚5 test tubes of 20x150mm‚ thermometer‚ 0.0020M KSCN‚ 0.002M Fe(NO3)3( IN 1.0M HNO3)‚ 0.2M Fe (NO3)3 (in 1.0M HNO3)‚ 4 pipets‚ pipet bulb‚ tissues. 5) Safety measure: Wear goggle and gloves to protect against
Premium Chemical reaction Chemistry Concentration
Ahmad Almusa Signature Group participants: [List names] Section Number: [List 3-digit number] Meeting Time: [Fill in the lab meeting time] TA: [Fill in the lab TA’s name] INTRODUCTION In this experiment I calculated the equilibrium constant for the reaction shown below under different conditions to determine if the equilibrium constant is really constant. Fe3+ (aq) + SCN– (aq) ←→ FeSCN2+ (aq) A big part of this lab includes understanding (and in the end proving) that absorbance is
Premium Chemistry Chemical reaction Chemical equilibrium
to it‚ the solution will turn blue-black. Aim: The aim for this experiment is to investigate how the different buffer solutions work on the enzyme amylase. This will be investigated by using iodine and by timing the experiment using the colorimeter and the program Loggerlite. Hypothesis: The pH denatures enzymes‚ and since amylase is an enzyme‚ my hypothesis is that the pH will change the shape of the active site of the enzyme‚ so the substrate will not be able to fit in anymore.
Premium Enzyme PH Buffer solution
An investigation into the effects of temperature on enzyme action An enzyme is a biological catalyst that speeds up the rate of reaction in certain biological functions. They play a vital role in many aspects of human physiology and are necessary for the functioning of a number of systems‚ for example in the digestive system to help to break down food. All enzymes have a unique active site that can fit on to a particular molecular arrangement on a target substrate; a substance e.g. carbohydrate
Premium Temperature Chemical reaction Chemistry
Practical Assessment Planning AIM Beetroot cells contain a red pigment‚ which is stored in the cell vacuole and a vacuole membrane to prevent this leaking out of the cell surrounds it. The outer of the cell is also surrounded by a membrane‚ which again helps contain the pigment inside the cell. In this experiment I aim to find out the relationship between the leakage of red pigment from a beetroot cell and the surface area. To do this successfully I will need to alter the surface area of the beetroot
Premium Cell membrane Cell Surface area
boiling tube racks Thermometer (one for each water baths) Colorimeter Cuvettes Stopcocks Distilled Water Pipettes Small measuring cylinder Independent variable: Temperature (°C) – this will be controlled by the water baths and each water bath will have a thermometer placed inside. The temperature will range from 0°C to 70°C and will go up in 10. Dependent variable: % of Absorbance- the absorbance will be measured by the colorimeter which will have 2cm3 of the dye solution to make it a
Premium Cell membrane Cell Cell wall
damaged‚ the red pigment will leak out into the surrounding environment. The intensity of color in the environment should be proportional to the amount of cellular damage sustained by the beet. To measure the color intensity‚ you will be using a Colorimeter or Spectrometer. In this device‚ blue light from the LED light source will pass through the solution and strike a photocell. The alcohol solutions used in this experiment are clear. If the beet pigment leaks into the solution‚ it will color the
Premium Protein Bacteria Cell membrane