Chemistry 161 Sample Quiz Chapters 1&2 KEY Harold Note: You have already received a significant figures/scientific notation sample quiz. The first ten problems (20 points) will be of exactly the same type. The numbers will be changed to offend the guilty (those who did not use the sample test as a study guide). 1. The term that refers to the reproducibility of a laboratory measurement is a. precision. b. repeatability. c. accuracy. d. exactness. e. the number of S.F. 2. The distance
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level CHEMISTRY Paper 1 Multiple Choice May/June 2005 1 hour Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 5070/01 w w w e tr .X m eP e ap .c rs om READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the answer
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Revision Notes -1- Edexel IGCSE Chemistry Revision Notes States of matter SOLIDS: (particles in contact; attractions hold them in fixed positions) • have definite shape and volume LIQUIDS: (particles in contact‚ and attract each other‚ but are free to move around) • have a definite volume • they take the shape of a container GASES: (particles widely separated; little or no attraction; move freely until they collide) • spread out (diffuse) and into all the space that is available
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OCR gateway Core C1 revision notes Anything written in purple is for higher tier Exam tips are in red Fossil Fuels 3 types Coal (made from dead plants that lived millions of years ago) Crude oil (made from dead sea creatures that lived millions of years ago) Natural gas (made from dead sea creatures that lived millions of years ago) Key words to learn Non-renewable- fossil fuels are said to be this as we are using them up faster than they can be made Finite- these will run out if we
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following statements about crystalline and amorphous solids is TRUE? A) An example of a crystalline solid is glass. B) An amorphous solid is composed of atoms or molecules with a majority of its volume empty. C) A crystalline solid is composed of atoms or molecules arranged with long-range repeating order. D) An example of an amorphous solid is table salt (NaCl). E) All of
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the value of Avogadro’s constant? A. 0.5 mol KBr B. 0.5 mol CaBr2 C. 1.0 mol CaO D. 1.0 mol K2O 6. Which molecular formulas are possible for a compound which has an empirical formula of C2H4O? I. CH3CH2OH II. CH3CH2CH2COOH III. CH3CH2COOCH3 A. I and II only B. I and III only C. II and III only D. I‚ II and III 7. Which compound has the empirical formula with the largest mass? A. CH4 B. C2H4 C. C2H6 D. C6H6 8. What is the maximum mass‚ in grams‚ of magnesium oxide that can be formed when 4.8 g of magnesium
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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 literally thousands of different hydrocarbons. The most important processes in the petroleum refining are fractional distillation‚ catalytic cracking and catalytic reforming. C. Coal Raw material
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Everything you need to know about hydrocarbons INTRODUCTION: organic chemistry Organic chemistry is the chemistry of compounds that contain carbon and hydrogen. The element carbon has a special role in chemistry because it bonds with other carbon atoms to give a vast array of molecules. The varity of molecules is so great that we find organic compounds in many common products we use‚ such as gasoline‚ medicines‚ shampoos‚ plastic bottles‚ and perfumes. The food we eat is composed of different
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163 CHAPTER 13 HYDROCARBON Hydrocarbons are composed of Carbon and hydrogen. The important fuels like Petrol‚ kerosene‚ coal gas‚ CNG‚ LPG etc. are all hydrocarbons or their mixture. Sources: Petroleum and natural gas are the major sources of aliphatic hydrocarbon while coal is an important source of aromatic hydrocarbons. The oil trapped inside the rocks is known as petroleum. PETRA – ROCK‚ OLEUM – OIL. The oil in the petroleum field is covered with a gaseous mixture known as natural
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organic. Use the naming organic compounds rules. * If the compound starts with a metal‚ it is most likely ionic. Use the naming binary ionic compounds rules. * If the compound starts with a nonmetal other than H or C‚ use the naming binary molecular compounds rules. It is also essential that you memorize some common polyatomic ions. Polyatomic ions behave as a unit. If you need more than one of them‚ enclose them in parentheses when you write formulas. You need to know their names‚ formulas
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