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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Science Assignment | March 22 2013 | Jessica Finney | Ms Croaker – Sc743A | Science Part A Assignment Choose one scientist involved in formulating the modern periodic table and describe why their work made a significant contribution to the development of the periodic table. Dmitri Mendeleev’s contribution to the modern day periodic table is widely renowned in the history of chemical science. Mendeleev was the creator of the periodic table; arranging 63 known elements in order of their
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UNIT 1 MATTER‚ CHEMICAL TRENDS AND CHEMICAL BONDING UNIT 1 MATTER AND CHEMICAL BONDING 1.1 The Study of Chemistry Chemistry is the study of matter and its properties‚ the changes (chemical‚ physical‚ and nuclear) that matter experiences‚ and the energy that is associated with these changes. The term STSE refers to science‚ technology‚ society‚ and the environment. These four areas are
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Transportation is the largest single source of air pollution Today’s on-road vehicles produce over a third of the carbon monoxide and nitrogen oxides in our atmosphere and over twenty percent of the global warming pollution. This air pollution carries significant risks for human health and the environment. Through clean vehicle and fuel technologies‚ we can significantly reduce air pollution from our cars and trucks‚ while cutting projected U.S. oil use in half within the next 20 years. Cars and
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------------------------------------------------- 1.Top of Form Arrange the following elements in order of increasing electronegativity: germanium‚ bromine‚ selenium‚ arsenic Please answer this question according to the general rules you have learned regarding periodic trends. DO NOT base your answer on tabulated values since exceptions may occur. | germanium smallest arsenic selenium bromine largest Feedback: Electronegativity is the ability of an atom in a molecule to attract electrons to itself. In general
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Science Folio Chapter 5 B6D5E1 Title: Importance of maintaining the cleanliness of air Introduction The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth’s gravity. The atmosphere protects life on earth by absorbing ultraviolet solar radiation‚ warming the surface through heat retention (greenhouse effect)‚ and reducing temperature extremes between day and night. One of the most important factors drawing international attention which is
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HKDSE Chemistry – A Modern View 1 (SAMPLE) Suggested Answers (Coursebook) |Chapter 1 The fundamentals of chemistry | |Class Practice |1 | |Chapter Exercises |3 | |Chapter 2 The atmosphere
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TOPIC 2 Metals The History of Metals * Uses of metals through history: * Copper Age (3200-2300 BCE) – copper and tin were most common metals‚ and were used for ornaments‚ weapons and tools. * Bronze Age (2300-700 BCE) – copper‚ tin and bronze were used for tools‚ weapons and transport. They produced bronze by heating copper and tin with charcoal. * Iron Age (1000 BCE – 1 CE) – iron steel and lead was used for tools‚ weapons and pipes. Iron is much harder than bronze.
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Surname Centre No. Candidate No. Paper Reference(s) Initial(s) Paper Reference Signature 7 0 8 1 7081/01 0 1 Examiner’s use only London Examinations GCE Chemistry Ordinary Level Paper 1 Wednesday 12 January 2011 – Afternoon Time: 1 hour 15 minutes Materials required for examination Nil Items included with question papers Nil Team Leader’s use only Question Leave Number Blank 1 2 3 4 5 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number
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1) Demonstrate understanding of the terms atom and molecule. Atom= Smallest Unit of Matter Molecule= 2 or more atoms chemically bonded. 2) Describe paper chromatography. 3) Interpret simple chromatograms. A method used to separate a Solution‚ using a Paper and a beaker of water. The Substances in the Paper go up depending on their Mass. We can say that a Solution has the same substance as another solution because they form a line of the same height. 4) Describe methods of separation
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