Chemistry CH. 1

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Definition of Chemistry

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Definition of Chemistry

Study of the composition, structure, physical and chemical properties and changes that may occur.

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What are the 6 branches of chemistry?

  1. Organic: the study of most carbon compounds

  2. Inorganic: the study of everything that is not carbon based

  3. Physical: the study of energy and changes of state

  4. Analytic: identifying unknown substances

  5. Theoretical: math and computers

  6. Biochemistry: living things

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WHICH IS AN EXTENSIVE PROPERTY?

Boiling Point 100C Freezing Point 0C 25 Joules Copper density 8.92 g/cm3

25 Joules

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Which is an example of an element?

WATER HYDROGEN SALT WATER RIVER WATER

Hydrogen

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Be able to give an example of a heterogenous mixture

river water

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Be able to give an example of a homogenous mixture

salt water

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WHICH ONE IS A CHEMICAL CHANGE?

Evaporating Melting Burning Freezing

Burning

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Examples of Physical Properties

Color, sizes, shapes

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What are the characteristics of a pure chemical compound?

Made of two or more different elements that are chemically combined

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Solid state

A solid's atoms are always bound together in uniform composition

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Chemical Properties

flammability, rusting, decomposing

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Which (is/are) the product(s)?

water -> hydrogen + oxygen

hydrogen + oxygen

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Which (is/are) the reactant(s)

water -> hydrogen + oxygen

Water

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Compound

Two elements that are chemically bounded together

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Homogenous

uniform in composition, physically combined

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Mixture

two or more substances that are physically combined

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Group/Family

Vertical column/group in periodic table

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Atom

smallest unit of matter

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Metalloid

In between metals (on the left) and nonmetals (on the right)

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Basic research

carried out for the sake of knowledge

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Metal

ductile, malleable, high strength, great conductors of heat and electricity

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Mass

Amount of matter that makes up materials

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Pure substances

Elements OR compounds, made up of 1 type of atom or two that are chemically combined

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Noble gasses

Group of 18, very unreactive

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Explain the difference between solid, liquid, and gaseous states in terms of the arrangement of particles:

SOLID: close together, fixed position LIQUID: close together, flow GAS: far apart, move rapidly, flow

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Contrast Mixtures and Pure Substances

MIXTURES are substances that are PHYSICALLY COMBINED while PURE SUBSTANCES elements or compounds that are CHEMICALLY COMBINED.

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What is the law of conservation of energy?

Energy is not created nor destroyed, it changes from one form to another.

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Heterogenous mixtures are mixed (UNEVEN/EVENLY) while homogenous mixtures are (UNEVEN/EVENLY) mixed.

UNEVEN, EVENLY

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How can you tell water is a compound and not an element?

You can run electricity through to decompose it.

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