molecule is said to be “polar”? -Because the molecule is a bit like a magnet with two poles. 1b. How do hydrogen bonds between water molecules occur? -The attraction between a hydrogen atom with a partially negative charge. 2b. Why is water such a good solvent? -Because water easily dissolves salts‚ sugars‚ minerals‚ gasses and even other solvents. 3b. The acid hydrogen fluoride can be dissolved in pure water. Will the pH of the solution be greater or less than 7? -The
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polychlorinated biphenyl‚ pyridine‚ 2‚4‚5-T‚ and parathion. PCB The first chemical to be effected by the fire is the PCB (polychlorinated biphenyl). This chemical is used as an electro conductor in the transformer and cools the transformer. PCB contains hydrogen‚ carbon and chlorine. This chemical can cause skin irritation and redness of skin in its original form if skin contact does occur. The LD50 for PCB is 8500 – 11‚900 ppm. Exposure to PCB can cause defatting and chlorance. Both of these are from
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Objective ! Candidates will react Magnesium with Hydrochloric acid and collect Hydrogen. The grams of the produced Hydrogen will be calculated and compared to the theoretical yield of Hydrogen. ! Controlled Variables ! Mass of Magnesium Ribbon This will be kept constant as the objective is to determine the Gas Constant (R). If this is influenced‚ then the overall yield will be affected as the amount of hydrogen produced will be altered. The mass will be controlled using a Scale. Amount
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the graphene sample to generate atomic hydrogen Inspired by the elegant idea to create graphane‚1there have been some efforts to decorate the graphene lattice with hydrogen atoms to transform it from a highly conductive zero-overlap semimetal into a nonzero gap semiconductor and thus tune its electric properties to suit wider practical applications.234 However‚ these attempts have been merely limited to cold hydrogen plasma treatment5 in which the hydrogen plasma bombardment also creates numerous
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The Earth’s atmosphere has changed over billions of years‚ but for the past 200 million years it has been much as it is today. We are‚ however‚ causing our atmosphere to change by human activity. Burning fossil fuels and deforestation are two examples of human effect on the environment. Composition of the Earth’s atmosphere The composition of air You need to know the proportions of the main gases in the atmosphere. The Earth’s atmosphere has remained much the same for the past 200 million years
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starts to dissolve and lets out the carbon dioxide gas. This is what makes the bubbles.Usually the tablet is used as a pain reliever and an antacid.the pain reliever is used in baking soda‚sodium bicarbonate.The pain reliever also includes sodium hydrogen carbonate
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CBSE TEST PAPER-03 CLASS - X (Chemical Reactions and equations) 1. Take about 5 ml of dil. HCl in a test tube and add a few pieces of fine granules to it. Which gas is evolved? (a) Chlorine (b) Hydrogen (c) HCl (d) Nitrogen 2. Dissolving suger is an example of(a) Physical change (b) Chemical change (c) Redox Reaction (d) None of these. 3. Heat is evolved diving (a) Endothermic Reaction (b) Displacement Reaction (c) Combustion Reaction (d) Combination Reaction 4. Which of the following is not a balanced
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Describe the preparation and reactions of alkenes. 7. Propose mechanism on preparation; dehydration of alcohol 8. Define carbocation‚ electrophile and Markovnikov’s Rule. 9. Propose mechanism on reaction addition of cold sulphuric acid and Hydrogen halide Alkanes Nomenclature of Alkanes Sources & Importance of Alkanes A. Natural Gas Consists of 90-95% methane with lesser amounts of ethane and other low-molecular-weight hydrocarbons. B. Petroleum Liquid mixture of
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Abstract This lab is performed in order to determine the total energy in a reaction between zinc and hydrochloric acid. The reaction is done twice‚ once to measure the heat of the reaction and again to determine the work done in the system. This is because Enthalpy equals heat plus work (∆H= ∆E+W). Heat and work can be broken down further into separate components so the equation used in lab is ∆H=mc∆T + PV. Many calculations are used in the lab to find out what cannot be measured directly (ex:
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Decreasing Fossil Fuels Over the past century America has continuously used its own fossil fuel resources and paid handsomely for additional supplies‚ in the race to stay current with modern technology and life .The possession of this resource has made the United States a very prosperous and powerful nation. The same fossil fuels that’s has made America such a powerhouse are the same that are damaging the environment and economy they have enabled. It is imperative that we decrease our dependency
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