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16 Cards in this Set
- Front
- Back
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scientific notation
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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 |
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Multiplying in scientific notation
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add exponents and multiply numbers
(3.4x10 to 2)(1.2x10 to 7)= (3.4x1.2)(10 to 2+7)= 4.08x10 to 9 |
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Dividing in scientific notation
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subtract exponents and divide numbers
(1.7x10 to 8)/(4.7x10 to 3)=1.7/4.7 (10 to 8-3) |
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Addition and subtraction in scientific notation
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exponents don't change
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Accuracy
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reflection of how near the actual measurement is
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precision
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reflection of how close multiple measurements are to one another
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density
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mass of object in relation to volume. grams/milliliter. Objects float if less dense than liquid or air
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mole
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quantity of a substance 6.02x10 to 23 representative particles of a substance (atoms, molecules) Avogadros number.
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Molar mass
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mass in grams of a substance
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matter
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anything that takes up space and has mass
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mass
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quantity of matter an object has
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elements
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substances that can't be broken down into simpler types of matter. Arranged specifically on periodic table
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atom
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smallest part of an element still retains element's properties
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atom structure
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nucleus (central core) with protons (+ charge has same number in any atom of same element) and neutrons (neutral charge)
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atomic #
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number of protons in nucleus of element, orders periodic table
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electron
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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
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