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The particles that substance are made of
 

The particles that substance are made of

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    The particles that substance are made of The particles that substance are made of Presentation Transcript

    • 112. The particles that substances are made of? Chemistry: Matter and materials Grade 10 Everything Science www.everythingscience.co.za
    • 2Atoms and compoundsThe smallest unit of matter is the atom. Atoms can combine to form compounds.A compound is a group of two or more different atoms that are attracted to each other byrelatively strong forces or bonds. The atoms are combined in definite proportions.In a compound, atoms are held together by chemical bonds. Covalent bonds, ionic bondsand metallic bonds are examples of chemical bonds.A covalent bond exists between non-metal atoms. An ionic bond exists between nonmetaland metal atoms and a metallic bond exists between metal atoms. Everything Science www.everythingscience.co.za
    • 3Classifying compounds Covalent molecular structures interact andexist as separate molecules. Network structures exist as giant repeatinglattices. Network structures can consist ofcovalent, ionic or metallic compounds. metallic network covalent network covalent molecular covalent molecular ionic network Everything Science www.everythingscience.co.za
    • 4Chemical formulae A chemical formula is an abbreviated (shortened) way of describing a compound.The molecular formula is a concise way of expressing information about the atoms thatmake up a particular covalent molecular compound. The molecular formula gives the exactnumber of each type of atom in the molecule.The empirical formula is a way of expressing the relative number of each type of atom in achemical compound. The empirical formula does not show the exact number of atoms, butrather the simplest ratio of the atoms in the compound. Everything Science www.everythingscience.co.za
    • 5Representing compoundsThe structure of a compound can be represented by stick, ball-and-stick or space-fillingmodels. A ball-and-stick model is a 3- A space-filling model is also a 3-A stick model use dimensional molecular model dimensional molecular model.coloured sticks to that uses “balls” to represent The atoms are represented byrepresent compounds. atoms and “sticks” to represent spheres. the bonds between them. Everything Science www.everythingscience.co.za
    • 6For more practice or to ask an expert for help on thissection see:www.everythingscience.co.zaESADO Everything Science www.everythingscience.co.za