Aim: To know the procedure of measuring the accurate mass of a solid To calculate the number of moles of an unknown mass from its mass and molecular mass To know how to dilute a solution and the effect of dilution on the solution’s absorbance Materials: Copper Sulfate Coloured solution – Potassium Manganate (KMnO4) Hotplate Method: Part A: The Formula of Hydrated Copper (II) Sulfate Firstly‚ about 1.0 g of hydrated copper (II) sulfate was put in the weighing bottle and the colour
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PPV‚ which is the abbreviated term for phenylenevinylene‚ has light emitting properties since it has a large conjugated system. This organic molecule is possible to be formed from dichloro-para-xylene which then reacts with methanol and thiolane. The nucleophile would be the thiolane. A good leaving group in this case would be chlorine. After thiolane attacks‚ it results with dithiolane-xylene. The second step is reaction with sodium hydroxide. The hydroxide it used for deprotonation upon the substituted
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1. The mole is a counting unit of chemistry that denotes a specific amount 2. Avogadro created this unit 3. He used 12 grams of carbon to figure out his unit‚ weighed out 12 grams and did multiple test calculations 4. Abbreviation for the mole is mol 5. Avogadro’s number is 6.022 x 10^23 6. 1 mole= 6.022 x 10^23 7. Avogadro used the number to create molar mass 8. Molar mass is the weight of an atom in 1 mol‚ g/mol is the unit 9. MM is the abbreviation for molar mass 10. A mole is defined
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M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ MARKSCHEME May 2010 CHEMISTRY Higher Level Paper 2 18 pages –2– M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IB Cardiff. –5– Subject Details: M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ Chemistry HL Paper 2 Markscheme
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movements of the players and the ball when a goal is scored? Chemical reactions are a similar case. He was able to follow chemical reactions in the greatest detail has prompted increasingly advanced technology. Ahmed H. Zewail‚ has studied atoms and molecules in "slow motion" during a reaction and seen what actually happens when chemical bonds break and new ones are created. [pic] He was the winner of the Nobel Prize for Chemistry because of his find of
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while others have to buy water or walk for miles to attain enough water to survive. In many cases water is being wasted. Hydrogen bonding holds water molecules together. At 32 degrees the kinetic energy is so low that the water freezes. When the temperature rises the kinetic energy thaws and we then have liquid water again. When the molecules absorb energy from the sunlight evaporation takes place and this is called water vapor which is
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chemical reaction: ____C3H8 + ____O2 ____CO2 + ____H2O Suppose 1.5 moles of propane was consumed in the reaction‚ answer the next three problems. How many grams is 1.5 moles C3H8 (propane)? How many grams CO2 is formed? How many molecules of H2O are formed? If 6.75 moles of O2 and 3.25 moles C3H8 were combined‚ how many grams H2O will be produced? Which is the limiting reagent? If 100 grams each of O2 and C3H8 were combined‚ how many moles CO2 will be produced? Which is the
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tells chemists how many atoms are in a chemical compound‚ formula unit or molecular compound. In a chemical formula a subscript indicates how many atoms there are of an element before it. The coefficient in a chemical formula indicates how many molecules of the formula unit‚ or chemical compound. The chemical formulas we use in this experiment are NaCl (sodium chloride/salt)‚ KCl (potassium chloride)‚ and CsCl (cesium chloride) and CaCl2 (calcium chloride). To form
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1. A 15‚67g sample of hydrate of magnesium carbonate was carefully heated‚ without decomposing the carbonate‚ to drive off the water. The mass was reduced to 7.58g.What is the formula of the hydrate? (10) 2. Construct balanced equations (including state symbols) to describe the following reaction: Potassium metal reacts with water to form potassium hydroxide solution and hydrogen gas (dihydrogen). (8) 3. Anhydrous lithium perchlorate (4.78g) was dissolved in water and recrystallized. Care was taken
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that is lost in the form of heat‚ but many of the previous technologies were inefficient and very polluting. Bergfield and Stafford discovered this new way to convert heat into electricity when they studied polyphenyl ethers. Each polyphenyl ether molecule consists of a chain of benzene rings‚ which are built from carbon atoms. The chain of benzene rings act let electrons flow down them easily‚ but the benzene rings also act as forks in the electron river‚ splitting the electron flow into two. Bergfield
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