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Published byRichard Jensen Modified over 11 years ago
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Bellringer Wed, 10/06 1.Please fill in the following missing letters in the pattern below… O T T F _ _ S U D T C _ _ S Reminders: LAB FEE NOW! HW #5 due Fri! FS CS One Two Three Four Five Six Seven Uno Dos Tres Cuatro Cinco Seis Siete
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Brief Intro to Chemistry
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What is everything made of? Everything is made of matter Matter is found as elements Elements are organized on the Periodic Table They are made of atoms
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What is an atom? Smallest unit of matter! Everything is made of atoms.
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Parts of an atom
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A happy atom must have… Number of p + = number of e -
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What makes atoms different? What makes an atom unique is the number of protons in nucleus We know what element the atom is if we know the # of p+ in nucleus How do we know the number of protons? we look on the periodic table!
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How to read element info! Element Symbol Atomic Number (#p + ) Mass Number (#p + + #n 0 ) Note: #n 0 = Mass Number - Atomic number
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So what does it look like?
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Atom + Atom Two or more atoms = molecule Element + element = compound All compounds have a formula (like a recipe! H 2 0, NaCl! Mixture: not chemically combined, can be separated (rice and corn) Solution: chemically combined, cannot separate physically (coffee, juice)
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