Chem Lect1

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Transcript of Chem Lect1

  • OSH 1143 Introduction of Chemistry

    m.adam.adman@gmail.com

    019-349 0190

    www.edmodo.com

    Code: eux5rr

  • Assessments:

    1. CM 60%

    1. M/T 10%

    2. Presentation 10%

    3. Asgmt/Tutorial (Quiz) 40%

    2. FE 40%

  • Flashback !

    1. Convert the following measurements into mL.

    a. 0.75 liters

    b. 3.2 x 104 L

    c. 0.5 m3

    2. Which is greater: 45 kg or 4500 g?

  • 3. Convert the following measurements into m.

    a. 280 cm

    b. 56100 mm

    c. 3.7 km

  • Check your answer

    1. a. 750 mL b. 32 mL c. 5 x 105 mL

    2. 3. 45 kg

    3. a. 2.8 m b. 56.1 m c. 3700 m

  • Start your SI Quiz

  • SI Base Unit

  • What is matter?

    Anything that occupies space and has mass.

  • Classification of matter

    Solid rigid objects with definite shapes.

    Liquid less rigid than solid and are fluid, able to flow & assume the shape of their containers.

    Gas are fluids but unlike liquids, they can expand indefinately.

  • Symbols

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    Element Symbol Latin name

    Sodium Na Natrium

    Iron Fe Ferrum

    Copper Cu Cuprum

    Gold Au Aurum

    Silver Ag Argentum

  • Definition:

    Atom

    - the smallest particle of an elements that retains the chemical nature of element.

    Molecule

    - a structure consisting of 2 or more atoms that are chemically bound together and behave as an independent unit.

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  • Substance matter that has a definite or constant composition and distinct properties.

    Ex:

    Water

    Silver

    Ethanol

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  • Mixture a combination of two or more substances and the substances retain their distinct identities.

    Ex:

    Air

    Soft drink

    Milk

    Cement

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  • Mixture

    Homogeneous

    Composition of the mixture, is the same throughout the solution.

    Ex: a spoonful of sugar dissolves in water.

    Heterogeneous

    Composition is not uniform.

    Ex: sand is mixed with iron filing.

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  • Elements -substances that cannot be decomposed into simpler

    materials by chem. reaction (1 type of atom). -Eg: Sodium, Chlorine, Hydrogen, Oxygen, etc. Compounds -contains 2 or more elements in chem. combination,

    it exhibits diff. prop. from its component elements. -Eg: water (hydrolysis)

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  • 16

  • Ion?

    An atom or a group of atoms that has a net +ve or ve charge.

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  • Cation an ion with a net +ve charge.

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  • Anion an ion whose net charge ve charge

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  • 20

    The total mass of substances does not change during a chemical reaction

  • Reference:

    1. Raymond Chang. General Chemistry-the essential concepts, 5th ed., McGraw-Hill.

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  • Tutorial 1

    Define these terms:

    Matter

    Substance

    Mixture

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