contain 10cm3 of corn oil and 1cm3 of lipase were kept at a range of temperatures between 20°C and 100°C. At the start of the experiment‚ the pH of the contents in each test tube was constant‚ which was 6.5. [pic] Figure 1.1 Each test-tube was left for 30 minutes and the reading on the digital pH meter was then recorded. The pH readings against different temperatures are plotted in a graph‚ shown in Figure 1.2. [pic] Figure 1.2
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Enzyme Lab Name ___________________________ Assignment 1: Getting to Know Enzyme Lab: Setting Up an Experiment The first screen that appears in Enzyme Lab shows you a biochemistry lab containing all the reagents and equipment you will need to perform your experiments. Click on each item in the lab to learn more about its purpose. Once you are familiar with the lab‚ click on the Experiment button to begin the first assignment. This assignment is designed to help you become
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Acid Rain Lab Acid rain is causing problems throughout the world. Acid rain is precipitation that has been combined with gases in the atmosphere‚ causing it to be slightly more acidic than normal rain. Acid rain has a PH level of about 5.0 compared to that of pure water’s 7.0. Acid rain is caused uniquely by human from such harmful wastes as the burning of fossil fuels. This type of rain is carried throughout the atmosphere‚ for hundreds of miles‚ harming countryside. The real question is whether
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required. The neutral pH is 7.0‚ however the natural pH of sea water is typically around 8.2 and that of fresh water is typically around 6.5. The answer to the question depends very much on whether or not we are discussing the environment or human health. Human Health: Our skin is slightly acidic (pH 5 to 5.5) and we can withstand low pH values quite readily. If we ingest or touch water which is basic (say‚ pH 10) we suffer much greater consequences than an equivalent acid (pH 4). The acid condition
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CHEM RESEARCH TASK 1. INDICATORS Identify and describe some everyday uses of indicators including the testing of soil acidity/basicity. • Indicators are used regularly in chemical laboratories during chemical reactions. One important use is to determine the end point of a titration when an acid reacts with an alkali. The reactants and products of such a reaction are colourless so an indicator is a useful way to visually determine when the reaction is complete. Chemists also need to monitor
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Factors Affecting Enzymes The activity of an Enzyme is affected by its environmental conditions. Changing these alter the rate of reaction caused by the enzyme. In nature‚ organisms adjust the conditions of their enzymes to produce an Optimum rate of reaction‚ where necessary‚ or they may have enzymes which adapted to function well in extreme conditions where they live.Increasing temperature increases the Kinetic Energy. In a fluid‚ this means that there are more random collisions between molecules
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(i) CH3COOH + H2O CH3COO– + H3O+ (ii) CH3NH2 + H2O CH3NH3+ + OH– (iii) HNO3 + H2SO4 H2NO3+ + HSO4 – (3) (c) A 25.0 cm3 sample of 0.0850 mol dm–3 hydrochloric acid was placed in a beaker. Distilled water was added until the pH of the solution was 1.25. Calculate the total volume of the solution formed. State the units. ........................................................................................................................ .................................
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ACIDS‚ BASES AND SALTS 1. What are indicators? What are the different types of indicators? An indicator is a dye which changes colour when put into an acid or a base. The different kinds of indicators are- Natural indicators- Litmus is a natural indicator‚ litmus solution is a purple dye which is extracted from a plant called lichen. Litmus turns red in acidic solutions and blue in basic solutions. Other
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EFFECTIVENESS OF COMMERCIAL ANTACIDS INTRODUCTION pH is a measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral‚ with a pH close to 7.0 at 25 °C (77 °F). Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline. An antacid is a substance which neutralizes stomach acidity. Antacids perform a neutralization reaction‚ increasing the pH to reduce acidity in the stomach. When gastric hydrochloric acid reaches
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can conduct electricity. Acids also readily give off hydrogen ions and have a pH level lower than 7. Some more common laboratory acids are Hydrochloric‚ Sulphuric and Nitric Acids. Sulphuric acids and water are used in car batteries as the electrolyte. Bases or alkali are a chemical that will react with acids and usually have a slimy or soapy feeling on contact with skin. Bases readily accept hydrogen ions and has a pH level that is higher the 7. Bases have a bitter taste and neutralise d by acids
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