OSH 1143 Introduction of Chemistry

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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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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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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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