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Chapter 3- Exploring Diversity of Matter by Its Chemical Composition

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Pei Xuan Soh

on 12 May 2013

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Transcript of Chapter 3- Exploring Diversity of Matter by Its Chemical Composition

Exploring Diversity of Matter by Its
Chemical Composition Chemical Composition Chemical components that make up a
substance. Compounds Made up of elements combined during a
chemical reaction = chemically combined.

Periodic Table Elements are classified
in two groups, metals
& non-metals. Mixtures > Different from compounds Chapter 3 Example:

An aircraft is made of aluminium, copper, magnesium, and zinc.

A mixture of metals allow construction of light aircraft body, able to withstand extreme stress.

*Aluminium - soft, unable to withstand extreme stress Elements Elements are matter in its simplest form, & basic building blocks of matter. Examples of

Aluminium Examples of combinations of

Silicon + Oxygen = Sand
Hydrogen + Oxygen = Water *An element cannot be broken down into two or more simpler substances. Horizontal line: Period
Vertical line: Group Properties of compounds
> Different from the elements it is made up of

> Always combined in a fixed proportion by mass

> Cannot be broken down by physical methods Because [ ] > 2 or more substances
physically mixed Properties of mixtures > Has the properties of substances it is made up of

> Not mixed in a fixed proportion > No chemical reaction > Can be separated by physical methods [ Thermal composition

Electrolysis ]
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