Xxx.comTheories of light In the seventeenth century two rival theories of the nature of light were proposed‚ the wave theory and the corpuscular theory. The Dutch astronomer Huygens (1629-1695) proposed a wave theory of light. He believed that light was a longitudinal wave‚ and that this wave was propagated through a material called the ’aether’. Since light can pass through a vacuum and travels very fast Huygens had to propose some rather strange properties for the aether: for example; it must
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ascending order of molecular mass‚ is called a homologous series. 15. Homologous : The members of the same class of organic compounds‚ when arranged in the ascending order of molecular mass‚ such that they differ by 14 amu or a – CH2 group are called homologous. 16. Alkanes (saturated hydrocarbons) : Compounds of carbon and hydrogen‚ in which all the valencies of carbon atoms are satisfied by single covalent bonds are called saturated hydrocarbons or alkanes. 1. Covalent bond or Molecular bond or Homopolar
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Chemistry 12 Review of Solubility Equilibrium 1. Identify each of the following as ionic or molecular substance: a. NaCl(aq) ________________________________ b. CH3COOH(aq) ___________________________ c. CCl4(l) _________________________________ d. HNO3(aq) ______________________________ e. C2H6(l) ________________________________ 2. A good way to test a liquid to see if it contains ions is to : 3. Define a saturated solution. 4. Define an unsaturated solution. 5. What is meant by solubility?
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structures for nitrite ion‚ NO2-? a) 1 and 2 b) 2 and 4 c) 3 and 4 d) 1‚ 2‚ and 3 e) 2‚ 3‚ and 4 6. . Which of the following elements is able to form a molecular structure that exceeds the octet rule? a) Ne b) B c) O d) F e) I 7. Which of the following elements is most likely to form a molecular structure that disobeys the octet rule? a) B b) C c) N d) O 8. What is the correct Lewis structure for IF3? 9. The central atom in PF5 is surrounded by
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Organic chemistry studies carbon compounds‚ but a few carbon compounds such as carbon monoxide‚ carbon dioxide‚ metal carbonates‚ and carbon disulphide traditionally come under the umbrella of inorganic chemistry. INTRODUCTORY 1. Give the following for the compound propane C3H8: (a) Full structural formula (b) Skeletal formula 2. Draw all the possible isomers of hexane C6H14 and give the name of each. 3. Draw the structural formulae for each of the following alkanes: (a) 2‚2- dimethylbutane
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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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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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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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