Chapter 15: Classification of Matter
Date:_____________
Learning Goals:

Identify substances using physical properties.

Compare and contrast physical and chemical changes.


Identify chemical changes.
Define the law of conservation of mass.
Physical Properties:
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Physical Property: any characteristic of a material that you can _________________________ without changing its ____________________________. o Examples:

Physical properties of a tennis ball:
Physical Changes:

Physical Change: a change in ____________, _______________, or ______________ of matter.

The _____________________ of the material stays the same!!! o Examples:

When a substance changes phase (like when water freezes or boils), it undergoes a
____________________ change!
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Separation: o The best ways to separate substances depends on their _____________________ properties. o ___________________ separates substances by size. o ____________________ can be used to magnetic substances from non-magnetic materials. o Many areas that lie close to the sea obtain drinking water by separating it from the _________. o The sea water is boiled and the steam is collected. Salt will not boil with the water, it has a
__________________________ boiling point.

o Distillation: the process of separating substances in a mixture by ________________________ a liquid and collecting the steam. The steam is then cooled down to form a liquid again.
Chemical Properties:

Chemical Property: a characteristic of a substance that can only be measured by __________________ the identity of a substance.

Examples:
Chemical Changes:
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Chemical change: a change of ___________________________________ into another. o All chemical reactions are chemical changes.

Four good indicators of a chemical change:
Conservation of Mass:

Burning a log is an example of a… o ______________________________________

The log seems to _______________________, and you are only left with _________.

What happened to the rest of it?

The log undergoes chemical changes and releases _________________________, _______________, and _______________.

It doesn’t just __________________________, it all goes __________________________.

Law of Conservation of Mass: the mass of all substances present ____________________ a chemical change is equal to the mass of all of the ____________________.