Sample Paper – 2012 Class – X Subject –Chemistry Chemical Equations and reactions Very Short Answer (1 marks each) Write the name and formula of compounds forms between a. Potassium and iodine ion .b.Sodium and sulphide ions . c. Aluminums and chloride ions 2. Why does milk sour when kept for a long time/ 3. What happen when hydrogen combine with oxygen in presence of electric current/ 4. Define electrolysis. 5. What is decomposition reaction? Give an
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2/8/11 Period 9 Chemical Reactions Chemical reactions happen in almost everything around us. Reactions are very important in everyday life‚ and science. Chemical reactions are the changing of substances to other substances by the breaking of bonds in reactants and the formation of new bonds in products. There are different types of chemical reactions such as combination reaction
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Torque and Equilibrium Purpose: Apply principle of static equilibrium to determine a coefficient of friction. Research Question: What is the coefficient of friction between a meter stick and wall? Hypothesis: Tying a piece of string on to the end of a meter stick‚ put the other end of the meter stick against the wall so that the meter stick is horizontal and does not slide down the wall. Hang a weight on the meter stick sliding it to a point where the meter stick is about to come off from
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Chemical Bonding Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms ... a chemical bond. The two extreme cases of chemical bonds are: Covalent bond: bond in which one or more pairs of electrons are shared by two atoms. Ionic bond: bond in which one or more electrons from one atom are removed and attached to
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CHEMICALS IN COSMETICS (OVERVIEW) FACTSHEET A cosmetic is a substance or preparation that is designed to be used on any external part of the human body – including in the mouth – to change the odours of the body‚ to change its appearance‚ cleanse it‚ keep it in good condition‚ perfume it or protect it. Cosmetics include soap‚ shampoo‚ moisturiser‚ hair dye‚ perfume‚ lipstick‚ mascara and many other products‚ but do not include products regulated as therapeutic goods (medicines). Cosmetics are made
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Chemical Reactions Chemical Reactions Introduction In this paper you learn about the reactions that occur between backing soda and lemon juice. We will also describe what is occurring with the molecules on a molecular level. Lastly we will explain what chemical bonds are formed and or broken when lemon juice and backing soda. Observations of the Reactants When most people hear baking soda they think of the bright orange box sitting in their pantry or refrigerator soaking up the foul odors
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Study Guide for Ishi’s Brain In Search of America’s Last “Wild” Indian 1. Who wrote this book? Orin Starn 2. When did he write it? 2004 3. Where did the author do his dissertation research? Andes 4. When did the author first visit Yahi Country? 1997 5. How did Ishi die? Tuberculosis‚ March 1916. 6. How many Native Americans were estimated to be in California in 1848? 150‚000 7. How many Native Americans were estimated to be in California in 1900? 20‚000 8. What happened on Alcatraz Island
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Soren Chemicals 1. What is the addressable market size for Coracle? Is the first year goal of $1.5 million sales reasonable? (10 points) 2. Why is Soren struggling to sell Coracle? (10 points) 3. What is the highest price Soren can set for Coracle? (7 points) 4. What action plan do you recommend for Coracle? (13 points) Q1. Coracle is one of the clarifiers developed and produced by Soren Chemicals targeting residential pools which have smaller size than commercial pools and water
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Naming Chemical Compounds General Information: Scientists all around the globe use a standard method for naming chemical compounds. The standards were set up by an international committee sponsored by the International Union of Pure and Applied Chemistry (IUPAC). Having this standard makes life easier for people who use these compounds everyday. It would be tough to set up any experiment if scientists everywhere used different names for the same compound. It would also make the lab a
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Introduction Les Mills is fully New Zealand owned operated‚ Les Mills are a team of passionate‚ positive professionals who have been making a difference in people’s lives since Olympian Les Mills opened the Auckland Club in 1968. Les Mills International was founded by Phillip Mills and named after his father Les Mills‚ four times Olympian and founder of the Les Mills World of Fitness chain in Auckland‚ New Zealand‚ Phillip and his team developed new programs and distributed it via DVD to improve
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