Class X Question 1: Chapter 1 – Chemical Reactions and Equations Science Why should a magnesium ribbon be cleaned before burning in air? Answer Magnesium is very reactive metal. When stored it reacts with oxygen to form a layer magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air. Question
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Corrosion of Metals Introduction Have you ever had a bike that went rusty‚ figure 1? If the paint is scratched and the rust allowed to spread‚ it is very difficult to repair the frame so it looks as good as new again. Rusting costs us millions of pounds each year‚ either through replacing things or through trying to prevent it happening in the first place. Figure 1: Bike rusting. In this booklet you learn about rusting and ways of stopping it‚ followed by a look at another metal‚ aluminium that
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Purpose: The purpose of this lab was to analyze the trends of the atomic radius (AR) and the first ionization energy (IE) for the first 36 elements of the periodic table. Procedure: A piece of graph paper was given out by the teacher. A periodic table that has the atomic number‚ atomic radius (AR)‚ and first ionization energy (IE) was given out by the teacher. A sheet of paper was taken out to record the elements‚ atomic number‚ atomic radius (AR)‚ and the first ionization energy (IE). To record
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Hydrochloric Acid‚ my hypothesis is a Single Displacement. D.) Alcohol and Oxygen‚ my hypothesis is a Combustion. E.) Lead (II) Nitrate and Potassium Iodide‚ my hypothesis a Double displacement. F.) Copper and oxygen‚ my hypothesis is a synthesis. G Magnesium and oxygen‚ my hypothesis is a synthesis. H.) Acetic acid and Sodium bicarbonate‚ my hypothesis is a double displacement. I.) Copper (II) carbonate and Hydrochloric acid‚ my hypothesis is a double displacement. Data: Attached. Conclusion:
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____________________ PERFORMANCE GOALS: 1. To learn how to use of a calorimeter 2. To learn how to collect and manipulate data in the computer 3. To calculate the calorimeter constant 4. To use Hess’ Law to find the heat or formation of magnesium oxide CHEMICAL OVERVIEW: • Enthalphy: (ΔH) : when chemical or physical changes occur at a constant pressure. • Calorimeter: is an instrument with insulating walls where the reaction happens. Eq. 1: q rxn = -qsurrounding
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|Time for sulphur to appear |6 seconds |140 seconds |79 seconds | Part 2 |[HCl] Acid Solution |Time (s) for Magnesium Ribbon to disappear | |6.0 mol/L |33 s
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high intensity and prolonged endurance. 2. It has sodium‚ potassium‚ calcium and magnesium which replenish the electrolytes commonly lost through sweat. Electrolytes regulate body’s water and blood pH level. UNIQUE SELLING PROPOSITION To male and female that are active in sports. It is designed to balance the body fluids to give fast hydration and energy. It has Electrolytes (sodium‚ potassium‚ calcium and magnesium) and Carbohydrates which is effective and ideal in maintaining performance in sports
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Aim: To compare the foaming capacities of five different commercial soaps. Apparatus: 5 test tubes‚ 5 conical flasks (100 ml)‚ test tube stand‚ Bunsen burner and stop watch. Materials Required: 5 different samples of soap and distilled water Theory: The foaming capacity of a soap sample depends upon the nature of soap and its concentration. This can be compared for various samples of soaps by taking the same concentration of solution and shaking them.The foam is formed and the time taken
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and you get hydrogen gas and oxygen gas. Anyway‚ hydrogen gas and sodium are both positive ions (atoms)‚ because opposites attract both of the positive ions are attracted to the negative electrode (cathode) in this case my cathode is a strip of magnesium. The chlorine gas and the oxygen gas are both negative ions and so they are attracted to the anode which in this case is iron. Now the chemical reaction REDOX which is short for reduction/oxidation reaction starts to take place. This means that the
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to polypropylene and bleached cotton fabrics. Introduction: In this experiment a Grignard reaction is performed with a Grignard reagent acting as the nucleophile1. Grignard reactions are very useful for the substitution of compounds containing magnesium
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