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Flashcards in Introduction to chemistry Deck (31):
1

Chemistry

The science that deals with the composition, structure, and properties of matter and the changes it undergoes

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Matter

Anything that has mass and takes up space

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Symbols

Represent elements.
Always begin with a capitals letter

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Pure substance

A distinct type of matter
Same properties throughout sample

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Compound

Substances composed of two or more elements

Always has the same physical and chemical properties

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Mixture

A sample of matter made up of two or more substances.

Those substances are called components

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Homogenous mixture

A SOLUTION

only one phase through the whole sample

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Heterogeneous mixture

Mixture with more that one phase

do NOT have the same properties throughout the sample

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Intensive properties

Independent of the sample size

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Extensive properties

Depend on the QUANTITY of the sample measured

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Physical properties

Characteristics that can be observed and measured without changing the substances identity

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Chemical properties

Ability of a substance to undergo a change that transforms it into a different substance

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List of physical properties

Color
Shape
Size
Density
Melting point
Boiling point
Freezing point
Viscosity
Bouancy
Surface tension
Ductility
Magnetism

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Density

Mass/volume

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Viscosity

Resistance of fluid to flow

The stronger the intermolecular attraction, the harder it is to flow

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Surface tension

The force in the surface of a liquid that makes the area of the surface as small as possible

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Freezing point

Temperatures at which liquid becomes solid

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Melting point

Temperature at which solid becomes liquid

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Boiling point

Temperature at which the liquids vapor pressure equals the pressure on the sample

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Melting

Solid turns into liquid at melting point

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Freezing

Liquid turns into solid at freezing point

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Condensation

Gas turns into liquid

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EvAporation

Liquid turns into gas at boiling point

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List of chemical changes

Rusting
Burning
Dehydration

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Combustion

The rapid reaction of materials with oxygen that gives off heat and light

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Dehydration

(Desiccation)
The removal of water from a substance

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Physical weathering

Rocks break into smaller pieces

Each piece Retains the original composition

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Chemical weathering

Rocks break down chemically

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Law of conservation of mass

In any physical or. Helical change, MASS IS CONSERVED

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Element

A substance which can NOT be decomposed by chemical reactions

31

Why is it important to study chemistry

1. Chemistry knowledge is needed in every modern science
2. All materials engineers and technologists use were made or modified by chemical reactions
3. Everything around us is a chemical
4. Chemical reactions are a part of everything we do
5. Study of chemistry will help in making decisions in the issues facing us in the modern world