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30 Cards in this Set
- Front
- Back
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a unique substance that cannot be decomposed or broken down into simpler substances by ordinary chemical methods
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element
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4 elements that make up 95% of our bodies
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oxygen, carbon, hydrogen, and nitrogen
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oxygen
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o
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carbon
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c
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hydrogen
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h
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nitrogen
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n
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calcium
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ca
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phosphorus
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p
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potassium
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k
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sulfur
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s
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sodium
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na
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chlorine
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cl
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magnesium
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mg
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iodine
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i
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building block of an element... the smallest particle that still retains its special properties
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atom
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positive charge
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proton
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netural charge
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neutron
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negative charge
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electron
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inside the nucleus
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protons and neutrons
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outside the nucleus
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electrons
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equal to the number of protons its atom contains
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atomic number
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when two or more elements combine chemically, ________ is formed
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molecules
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formed when electrons are completely transferred from one atom to another
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ionic bond
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formed when atoms are share electrons
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covalent bond
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acids that ionize completely and liberate all of their protons are called
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strong acids
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acids that ionize incompletely are called
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weak acids
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negative ions
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anions
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positive ions
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cations
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pH lower than 7
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acids
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pH higher than 7
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bases
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