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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