ATOMS-ELEMENTS AND COMPOUNDS REVISION

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An excellent presentation for revision of the concepts of atoms, elements and compounds. Self assessment and self paced learners package.

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ATOMS-ELEMENTS AND COMPOUNDS REVISION

  1. 1. ATOMS AND ELEMENTS Define Particle, Atom, Element, Compounds and Periodic table. Contents of Slide Presentation Intro Atoms & Elements Atoms – What are atoms About an atom Atoms & Shells Subatomic Particles Compounds and Chemical Elements Quick Quiz Atomic Number Atomic Number Calculations Mass Number Calculations Neutral Atom Copy right © Science-tutors Media 2008 www.sciencetutors.zoomshare.com
  2. 2. ATOMS <ul><li>What are ATOMS? </li></ul><ul><li>Atoms are the basic building blocks or tiny particles (whose size are hard to imagine or even comprehend) that makes up matter (everything) in the universe. </li></ul>www.sciencetutors.zoomshare.com
  3. 3. ABOUT AN ATOM (SUB ATOMIC PARTICLES) <ul><li>Note keywords: Basic, building , blocks, particles, matter, microscopic (size is hard to imagine) </li></ul>PROTONS NEUTRONS ELECTRONS Think of the sun with the planets spinning around it -this is how best you can probably describe and understand what an atom is. + Charge Charge Neutral Atomic Particles NUCLEUS Copy right © Science-tutors Media 2008 _
  4. 4. ATOMS AND SHELLS <ul><li>Electrons stay in their shells as they revolve round the nucleus because a special force (electrostatic force) holds them there. Protons (+ve charge) and electrons (- ve charge) are attracted to each other. </li></ul>SUBATOMIC PARTICLES - PROTONS , ELECTRONS and NEUTRONS Subatomic particles in all atoms are smaller than the atom itself. Copy right © Science-tutors Media 2008
  5. 5. SUBATOMIC PARTICLES (MEMORY TIPS) <ul><li>An easy way to remember this is </li></ul><ul><li>P roton and </li></ul><ul><li>P ositive start with the letter ‘ P’ </li></ul><ul><li>Neutrons have no electrical charge. </li></ul><ul><li>An easy way to remember this is </li></ul><ul><li>N eutron and n o electrical charge start with the letter ‘N’ </li></ul>Orbiting or circling/moving around outside the nucleus are tiny little particles called electrons Copy right © Science-tutors Media 2008
  6. 6. Compounds & Chemical Elements <ul><li>What are chemical elements? </li></ul><ul><li>What are compounds? </li></ul><ul><li>How are chemical elements different from compounds? </li></ul><ul><li>All materials or matter that is composed of only one type of atom is called a chemical element or just an element. </li></ul><ul><li>However, compounds are made when atoms of different elements are chemically joined or combined together. </li></ul>Squashed together in the middle of the atom are protons and neutrons Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah
  7. 7. Compounds & Chemical Elements Quick Quiz <ul><li>Which of these is an element or a compound? </li></ul>A B C D Compounds are atoms of different elements. Elements are composed of only one type of atom Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah
  8. 8. ATOMIC NUMBER <ul><li>What is an atom's atomic number? </li></ul><ul><li>What is an atom's mass number? </li></ul><ul><li>Atomic Number is a unique number that identifies how many protons are present in one atom of an element. </li></ul><ul><li>In science it is defined more precisely as the number of protons in the nucleus of an atom determines an element's atomic number. </li></ul>Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah
  9. 9. ATOMIC NUMBER ATOMIC NUMBER = Number of Proton Complete the table below Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah Element Atomic Number Number of Proton Oxygen 8 Chlorine 17 Sodium 11 Magnesium 12 Carbon 6
  10. 10. MASS NUMBER <ul><li>What is an atom's mass number? </li></ul><ul><li>Protons and neutrons are heavy particles which when added together make up an atom’s mass </li></ul><ul><li>A knowledge of atomic mass essentially tells us how many of these protons and neutrons there are in any atom. </li></ul>+ X number of protons Y number of Neutrons = x + y = mass number Mass number tells how many protons and neutrons are there in an atoms. Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah
  11. 11. MASS NUMBER Complete the table below Element Atomic Number Number of Mass Number neutrons Oxygen 8 16 Chlorine 17 18 Sodium 11 12 Magnesium 12 24 Carbon 6 12
  12. 12. NEUTRAL ATOM <ul><li>An atom is in balance or neutral, if it has the same number of protons and electrons. </li></ul>Neutral Atom is when the No. of Protons = No. of Electrons That means number of positive charges = The number of negative charges. So they cancel out and become neutral Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah
  13. 13. Neutral Atoms Or Charged Ions Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah Element No. of Protons No. of Electrons Neutral Ion Atom (+ve or – ve)
  14. 14. ATOMS AND MOLECULES <ul><li>Learning Outcomes </li></ul><ul><li>L Define chemical reaction, molecule, and compound, and name the atoms reacting and molecule produced in a reaction. </li></ul><ul><li>I Use these names to construct a word equation showing the reaction. </li></ul><ul><li>H Create a model of a chemical reaction between atoms to form a molecule. </li></ul>
  15. 15. REACTION OF METALS IN AIR <ul><li>Objectives </li></ul><ul><li>Metals can be heated in air to show signs of chemical reaction. </li></ul><ul><li>To understand how metal oxides are formed. </li></ul>
  16. 16. METAL OXIDE <ul><li>Outcomes </li></ul><ul><li>L Describe how to make an oxide safely and use your observations to list the signs of a chemical reaction. </li></ul><ul><li>I Name and identify elements involved in chemical reactions. </li></ul><ul><li>H Write word equations and predict name of product. </li></ul>
  17. 17. REACTIONS OF METALLIC ELEMENTS <ul><li>Copy and answer questions </li></ul><ul><li>What are metal oxides? </li></ul><ul><li>How are metal oxides formed? </li></ul><ul><li>Name the reactants and the product in the formation of metal oxides. </li></ul>
  18. 18. <ul><li>Learning Outcomes </li></ul><ul><li>L Plan a safe experiment to demonstrate the objective. </li></ul><ul><li>I Plan a safe and fair test for the experiment stated in the objective and write the work equation for the reaction. </li></ul><ul><li>H Critically evaluate the plan you have written in terms of safety and fair testing. </li></ul>
  19. 19. PRACTICAL REVIEW <ul><li>Discuss about chemical change, what elements and compounds were present? </li></ul>

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