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Define Chemistry.
The Study of matter and its changes.
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Define Scientific Method.
Steps in solving a problem following steps. 1. COllect data 2. Formulate Hypothesis 3. Plan experiments to test hypothesis 4. Modify hypothesis
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Define Hypothesis.
is a tentative explanation of certain facts. An educated guess.
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Define Theory.
A well establish hypothesis.
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Define Scientific laws.
Are simple statements of natural phenomena to which no exceptions are known under the given conditions.
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Define Matter.
Anything that has mass
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Define Solid.
A definite shape and volume, with particles that cling toghether
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Define Amorphous.
Solids that has no definate shape
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Define Liquid.
They have a volume but definete shape
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Define Gas
THey have indefinite volume and no fixed shape
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Define Substance
A specific type of matter with a fix composition
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Define Homogeneous
A subtance that has the same properties throughout
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Define heterogeneous
A subtance that has two or more disticnt phases
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Define Phase
ia a homogeneous past of a system seperated by physical bounderies.
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Define System
The body of matter under consederation.
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Define Mixture
is a material containing two or more substances can be heterogeneous or homogeneous.
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What is Sceintific Notion?
To write a number between 1 to 10 multiplied by 10 raised to some power. Moved right give a negative exponent. Moved to left five a positive exponent.
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What is a measurement?
A quantitive observation
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Define significant figures
Digits used to express a measurement
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Equation to convert Fahrenheit to Celsius
C=F-32/1.8
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Equation to convert Celsius to Fahrenheit
F=(1.8 x C) + 32
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Equation to convert Celsius to Kalvin
K= C+ 273.15
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Define Rounding off numbers?
Rounding a number up or down depending wheather a number is higher or lower than 5
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Define Metric System
A measuring system based on the standard of 10 units
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Define Mass.
Anything that occupies space
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Define Weight
The effect of gravity on an object
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Define Kilogram
The standard measurement of the metric system (equal to 1000g)
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Define Volume
The amount of space occuppied by matter
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Define Litter
One cubic Decimiter
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Define Temperature
A measure of the intensity of thermal energy, or how hot a system is, regarless of size
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Define Density
Desity= Mass/Volume
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Define Specific Gravity
Specific Gravity= Jesity of a liquid or solid/ density of water (The ration of density of anohter subtance)
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Define Element
Elementary subtance that cannot be broken down by chemical means to a smaller substance
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Define Atom
The smallest particle that an element can exist.
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Define Symbols
Abbreviations of elements
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Define Groups
Elements that has similar of chemical properties
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Define Noble Gases
Gasses and nonreactive
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Define Metals
Solids at room temperature. They have high luster, good conductors of electricity and heat. Can be malleable
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Define Nonmetals
Have low melting point and density, poor conductors,
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Define Metalloids
Elements have properties that are intermidiate between metals and nonmetals
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Diatomic Molecules
Molecutes that always excist with two atoms
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What are the Diatomic Molecules
Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine
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Define Compound
A distinct Substance that contains two or more elements chemical bound
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Define Molecule
Is the smallest uncharge individual unit of a compound formed by the union of tow or more atoms
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Define Ion
A positive or negative charge atom
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Define Cation
A positive charge atom
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Define Anion
Negative charge atom
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Define Chemical Formula
Shows the symbal sand the ratio of the atoms in a compound
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Define Subcripsts
Numbers that appear below the line of a symbal
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