Chemistry CH. 1

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Definition of Chemistry
Study of the composition, structure, physical and chemical properties and changes that may occur.
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
WHICH IS AN EXTENSIVE PROPERTY? Boiling Point 100*C Freezing Point 0*C 25 Joules Copper density 8.92 g/cm3
25 Joules
Which is an example of an element? WATER HYDROGEN SALT WATER RIVER WATER
Be able to give an example of a heterogenous mixture
river water
Be able to give an example of a homogenous mixture
salt water
WHICH ONE IS A CHEMICAL CHANGE? Evaporating Melting Burning Freezing
Examples of Physical Properties
Color, sizes, shapes
What are the characteristics of a pure chemical compound?
Made of two or more different elements that are chemically combined
Solid state
A solid's atoms are always bound together in uniform composition
Chemical Properties
flammability, rusting, decomposing
Which (is/are) the product(s)? water -> hydrogen + oxygen
hydrogen + oxygen
Which (is/are) the reactant(s) water -> hydrogen + oxygen
Two elements that are chemically bounded together
uniform in composition, physically combined
two or more substances that are physically combined
Vertical column/group in periodic table
smallest unit of matter
In between metals (on the left) and nonmetals (on the right)
Basic research
carried out for the sake of knowledge
ductile, malleable, high strength, great conductors of heat and electricity
Amount of matter that makes up materials
Pure substances
Elements OR compounds, made up of 1 type of atom or two that are chemically combined
Noble gasses
Group of 18, very unreactive
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
Contrast Mixtures and Pure Substances
MIXTURES are substances that are PHYSICALLY COMBINED while PURE SUBSTANCES elements or compounds that are CHEMICALLY COMBINED.
What is the law of conservation of energy?
Energy is not created nor destroyed, it changes from one form to another.
Heterogenous mixtures are mixed (UNEVEN/EVENLY) while homogenous mixtures are (UNEVEN/EVENLY) mixed.
How can you tell water is a compound and not an element?
You can run electricity through to decompose it.