Elements & Compounds
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Elements & Compounds

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A set of slides created to teach Elements & Compounds to learners at Bishops Diocesan College in Cape Town.

A set of slides created to teach Elements & Compounds to learners at Bishops Diocesan College in Cape Town.

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Elements & Compounds Elements & Compounds Presentation Transcript

  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Elements
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Compounds Elements: - ______ ______________ when mixed form a __________ MIXTURES - can _______ to form completely new substances called _____________. COMPOUNDS - simplest particles are ______________ have new/different ________________. Iron sulphur Elements Compound MOLECULE Iron Sulphide REACTION Mixture S atom Fe atom
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Elements, Compounds and Mixtures Iron & sulphur, sugar and salt, sand and stone Can be separated by PHYSICAL methods. ELEMENTS are made up of one substance only. Compounds are formed when one or more elements combine chemically -REACT Mixtures are formed when different substances are mixed together. Solutions are mixtures. Carbon Sulphur Iron Cannot be separated into simpler substances. Sodium chloride Calcium carbonate Can be CHEMICALLY separated into simpler substances.
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe An atom consists of a _________________ which has _________ and ___________ in it, surrounded by ______________ which orbit the nucleus at high speed. The electrons are ______________ charged - the protons are _____________. The number of electrons is always ________ to the number of protons. The Atom
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe THE NEUTRAL ATOM • The atom consists of a _________ containing _______ and _________ surrounded by a cloud of _________. • Protons = _______________ (in a _______________ atom.) Notation Z A X_________________ (smaller) = _________________ _________________ (bigger) protons + _________ symbol Number of neutrons = __________
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Elements & Compounds Decide which of the following substances are elements and which are compounds. State which simpler substances each compound can be broken down into. Substance Element /Compound Simpler Substances Salt (NaCl) Copper Carbon dioxide Nitrogen Graphite (carbon) Water (H2O) Chalk (calcium carbonate) Glass (silicon dioxide) Aluminum 8 marks 9 marks
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe The Atomic Symbols Li 6 3 Atomic mass (A) - number of 6 protons and neutrons Atomic number (Z) - 3 protons in the nucleus (and electrons.) The symbol for the Lithium Neutrons = Atomic Mass - Atomic Number = A - Z = 6 - 3 = 3
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Atomic Structure Symbol Notation Name Protons Neutrons Mass Number Electrons Calcium 31 15P 14 30 13 6 Mg
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe The Periodic Table I VIII Columns Groups Rows= Periods II III IV V VI VII <-- Group Numbers --> O Oxygen is in group 6 and period 2. S Block d Block P block F block 1 2 3 4 5 6 7
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Reaction Equations O ……… O ......... O O + TWO molecules of …………. gas and One MOLECULE of ………… gas REACT to form Two MOLECULES of …………… H2 H2 O2 …..H2 + O2  ……H2O
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Bonding Element 1 & Valency Element 2 & Valency Element 1 - bonds Element 2 - bonds Compound Formulae Na +1 Cl -1 Na — Cl— Na —Cl NaCl H +1 O -2 H— O H O H H2O Na +1 S -2 Na — S Na S Na Na2S Ca +2 O -2 Ca O Ca O CaO H +1 C -4 H — C H H —C —H H CH4 Li +1 O -2 Li — O Li — O Li Li2O Si +4 O -2 Si O O = Si = O SiO2 C +4 O -2 C O O C O CO2
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Information: A bunsen burner can have two different flames (Blue and yellow). The flame can also produce soot. We aim to determine which flame produces the most soot, to compare that with the flame of a candle and also investigate other compounds produced in the flame. Hypothesis: State which flame you think will produce the most soot. Also state which other compounds you think may be formed in the flame. (The reacting compounds are methane (CH4) and oxygen (O2). ...................................................................................................................................................... ....................................................................................................................................................... ……… hole ……. flame ……… hole ……. flame ……….or ……………… ……………… Investigation: The aim of this investigation is to determine the reaction that takes place in a bunsen burner flame. Bunsen Burner Investigation
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Reactions React to form CH4 + 2O2  CO2 + 2H2O Methane and oxygen react to form carbon dioxide and water + + Methane CH4 Oxygen O2 carbon dioxide CO2 Water H2O (steam) AIR HOLE OPEN React to form CH4 + O2  C + 2H2O Methane and oxygen react to form carbon and water + + AIR HOLE CLOSED
  • SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> ScienceCafe Hi - This is a SAMPLE presentation only. My FULL presentations, which contain loads more slides (with all the gaps filled in) as well as other resources, are freely available on my resource sharing website: www.sciencecafe.org.za (paste into your browser if link above does not work) Have a look and enjoy! Keith Warne