Purpose: The purpose of the lab was to investigate and demonstrate hydrogen bonding and London dispersion bonding in water and rubbing alcohol. Hypothesis: I believe water will have the greater surface tension because rubbing alcohol’s density is lower than water’s. Materials: * Water * Isopropyl alcohol (rubbing alcohol) * Pennies * Paper clips * Flasks * Cups or jars * Wax paper * Eyedropper Procedures: Part 1: Surface tension and vortex: * Fill
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determined by consulting a periodic table. Generally‚ metals on the left will be positive and non-metals on the right will negative. The periodic table below shows the general trend for ionic charges 3) Hydrogen is either a +1 (with nonmetals) or a -1 (with metals) Oxygen is a -2 except when in a peroxide (H2 02) then it will be a -1 4) In compounds‚ all other atoms are given an oxidation number so that the sum of the oxidation number on all atoms in the species will equal the overall charge of the
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 0620/01 October/November 2008 45 Minutes *6400528663* 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
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types of reactions: 1. addition of oxygen 2. removal of hydrogen 3. increase in valency (how easily an atom can combine with other chemical species) Reduction → the gain of electrons → always happens at cathode (negative electrode) → think catHode (H2 produced in the electrolysis of water xp) An oxidising agent is a substance that allows oxidation (the loss of electrons) to occur by being reduced (by taking in those electrons) e.g. hydrogen peroxide (hair bleaching)‚ oxygen (respiration) Real Life Application
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Mark Scheme (Results) Summer 2012 International GCSE Chemistry (4CH0) Paper 1C Science Double Award (4SC0) Paper 1C Edexcel Level 1/Level 2 Certificate Chemistry (KCH0) Paper 1C Science (Double Award) (KSC0) Paper 1C Edexcel and BTEC Qualifications Edexcel and BTEC qualifications come from Pearson‚ the world’s leading learning company. We provide a wide range of qualifications including academic‚ vocational‚ occupational and specific programmes for employers. For further information‚
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The Identification and Production of Materials 1. Fossil fuels provide both energy and raw materials such as ethylene‚ for the production of other substances. Students Learn To: .2 Identify the industrial source of ethylene from the cracking of some of the fractions from the refining of petroleum. • Ethylene is produced either from natural gas or crude oil‚ which are mixtures of hydrocarbons. One method involves… Cracking: a process by which hydrocarbons with higher molecular
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that has the chemical characteristics of that element. -An element or an atom of that element often is represented by a symbol. -Usually the first letter or letters of the element’s name is/are used. For example‚ C for Carbon‚ O for Oxygen‚ H for Hydrogen‚ Ca for Calcium‚ Cl for Chlorine‚ K for Potassium and Fe for Iron. -The symbol is taken from English and Latin names. Atomic Structure: The characteristics of living and nonliving matter results from the Structure‚ Organization and behavior of
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(no insoluble end products are formed) can he divided into two broad groups: (1) corrosion with no hydrogen evolution‚ and (2) corrosion with hydrogen evolution. Hydrogen is liberated in those processes when H+ ion is acting as depolarizer (electron acceptor). If‚ however‚ the solution contains a depolarizer other than H+ ions‚ as for example Oz‚ H202‚etc.‚ then corrosion proceeds with hydrogen evolution. It is the purpose of this paper to report that all these corrosion processes follow a
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Binary Compounds w/ Fixed Charge Given The Formula‚ Write The Name Binary Compounds w/ Fixed Charge Given The Name‚ Write The Formula Binary Compounds w/ Variable Charge: Stock System Given The Name‚ Write The Formula Binary Compounds w/ Variable Charge: Stock System Given The Formula‚ Write TheName 1) MgO 2) LiBr 3) Ca3N2 4) Al2S3 5) KI 6) SrCl2 7) Na2S 8) RaBr2 9) MgS 10) AlN 11) Cs2S 12) KCl 13) Sr3P2 14) BaI2 15) NaF 16) CaBr2 17) BeO 18) SrS 19) BF3 20) AlP 21) Rb2O 22) CaI2
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Periodic Table: * Mass Number = protons + neutrons in the nucleus * Atomic Number = number of protons in the nucleus * Number of neutrons = mass number – atomic number Example: Lithium (Li) * # of protons + # of neutrons = mass # * 3 + 4 = 6.9/ 7 * The atomic mass is the mean of all the isotopes of Lithium in nature; round the number * Isotopes of a specific element have a varying number of neutrons * The number
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