Unit 1 test Flashcard

Tera(T)
10^12
1,000,000,000,000
Giga(G)
10^9
1,000,000,000
Mega(M)
10^6
1,000,000
Kilo(k)
10^3
1,000
Hecto(h)
10^2
100
Deka(da)
10^1
10
Deci(d)
10^-1
1/10
Centi(c)
10^-2
1/100
Milli(m)
10^-3
1/1,000
Micro
10^-6
1/1,000,000
Nano(n)
10^-9
1/1,000,000,000
Pico(p)
10^-12
1/1,000,000,000,000
femeneto(f)
10^-15
1/1,000,000,000,000,000
Atto(a)
10^-18
1/1,000,000,000,000,000,000
Density=
mass/volume
volume=
mass/density
mass=
density x volume
Chemistry
the science that deals with the composition and properties of substances and various elementary forms of matter.
Chemical Changes
any change from one state (gas, liquid, solid) which is accompanied by alteration of the chemical composition
Physical Changes
any process involving a substance’s change from one state (gas, liquid, solid) to another without alteration of the chemical composition
Element
one of a class of substances that cannot be separated into simpler substances by chemical means.
Compound
a pure substance composed of two or more elements whose composition is constant.
Mixture
A composition of two or more substances that are not chemically combined with each other and are capable of being separated.
Homogeneous mixture
any combination of substances that has uniform composition and properties; a mixture that is uniform throughout
Heterogeneous mixture
any combination of substances that does not have uniform composition and properties; a mixture of physically distinct substances with different properties
Metals
Any of a category of electropositive elements that usually have a shiny surface, are generally good conductors of heat and electricity, and can be melted or fused, hammered into thin sheets, or drawn into wires
Nonmetals
Any of a number of elements, such as oxygen or sulfur, that lack the physical and chemical properties of metals.
Periods
A sequence of elements arranged in order of increasing atomic number and forming one of the horizontal rows in the periodic table.
Groups
In the Periodic Table, a vertical column that contains elements having the same number of electrons in the outermost shell of their atoms.
Presicion
the extent to which a given set of measurements of the same sample agree with their mean.
Accuracy
the extent to which a given measurement agrees with the standard value for that measurement.

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