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Introduction to chemistry

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Elements, Compounds and mixtures

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Introduction to chemistry

  1. 1. D O E S I T E V E N M AT T E R ? ? INTRODUCTION TO CHEMISTRY
  2. 2. ELEMENTS, COMPOUNDS AND MIXTURES • An element is a pure substance that cannot be separated into simpler substances by physical or chemical means. • An Element contains only One type of particle. A substance in which there is only one type of particle is a pure substance. Elements are made of particles called atoms. • So in conclusion, an element is a substance made up of only ONE type of atom. • An element has characteristic properties such as boiling, melting points, hardness, density, shine…etc. which can be used to identify it.
  3. 3. • What if you entered a supermarket where all the goods were placed in no special order? Discuss what would happen. Is dividing groceries into sections or departments useful? What advantages do you get from dividing groceries into departments?
  4. 4. EXAMPLES OF ELEMENTS
  5. 5. MORE ELEMENTS
  6. 6. HOW CAN ELEMENTS BE ARRANGED INTO GROUPS?? How would you classify elements?
  7. 7. COMPOUND • A compound is a pure substance composed of two or more elements that are chemically combined. Elements combine by reacting with one another. • A particle of a compound is a called a molecule. • Molecules of compounds are formed when atoms of two or more elements bond together.
  8. 8. A COMPOUND HAS DIFFERENT PROPERTIES THAN THE ELEMENTS IT CONTAINS.
  9. 9. • A compound can be changed into its elements by breaking the bonds between the atoms. This is referred to as a chemical change. • Heat (thermal energy) or electrical energy can be used to break down a compound into its elements. This is called chemical decomposition. • Example : electrolysis of water • https://www.youtube.com/watch?v=HQ9Fhd7P_HA • https://www.youtube.com/watch?v=gZJEDe_HUcw
  10. 10. MIXTURE • A mixture is a combination of two or more substances that are not chemically combined. • No Chemical Changes in a Mixture No chemical changes happen when a mixture is made. So, each substance has the same chemical makeup it had before the mixture was formed. • Mixtures can be separated by physical means. • Give examples of mixtures you have in your day. • How can you separate the mixture?
  11. 11. CAN YOU USE THE WORDS YOU HAVE JUST LEARNT TO DESCRIBE A, B AND C?

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