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16 Cards in this Set

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scientific notation
number written as a product of a number between 1.00 and 9.99 and 10 raised to a power
3527=3.527x10 3
.3452=3.425x10 -1
Multiplying in scientific notation
add exponents and multiply numbers
(3.4x10 to 2)(1.2x10 to 7)=
(3.4x1.2)(10 to 2+7)=
4.08x10 to 9
Dividing in scientific notation
subtract exponents and divide numbers
(1.7x10 to 8)/(4.7x10 to 3)=1.7/4.7 (10 to 8-3)
Addition and subtraction in scientific notation
exponents don't change
Accuracy
reflection of how near the actual measurement is
precision
reflection of how close multiple measurements are to one another
density
mass of object in relation to volume. grams/milliliter. Objects float if less dense than liquid or air
mole
quantity of a substance 6.02x10 to 23 representative particles of a substance (atoms, molecules) Avogadros number.
Molar mass
mass in grams of a substance
matter
anything that takes up space and has mass
mass
quantity of matter an object has
elements
substances that can't be broken down into simpler types of matter. Arranged specifically on periodic table
atom
smallest part of an element still retains element's properties
atom structure
nucleus (central core) with protons (+ charge has same number in any atom of same element) and neutrons (neutral charge)
atomic #
number of protons in nucleus of element, orders periodic table
electron
negative charge, usually equal number of electrons and protons for overall charge of zero and orbit nucleus in energy levels that each hold a limited # of electrons (# of levels varies by element) Atom isn't stable unless outermost energy level is full so atoms combine with other elements and form molecules