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13 Cards in this Set
- Front
- Back
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Define atom
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The basic unit of matter
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Describe the size, charge, and location of three subatomic particles that make up the atom
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Proton - sameness,+,nucleus
Neutron - sameness, neutral, nucleus Electron - very light, mass o of proton, moves around outside of nucleus |
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Explain why atoms are neutral
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Electrons are equal to # of protons
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Define element. How are elements represented?
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A pure substance containing only one type of atom
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Describe an isotope.
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Atoms of the same element but with different # of neutrons
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Why do isotopes of the same element hav ethe same chemical properties?
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Because tghey have the same # of protons and electrons
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Contrast mass number and atomic number
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mass number - # of protons and
neutrons atomic number - # of protons |
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Define compound. Give 2 examples.
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A combination of 2 or more elements in definite proportions
ex. water, salt, sugar |
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Explain how scientists express compounds
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By a formula - H2O, NaCl,
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Define ionic bond
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Atoms in compounds are held together by bonds, formed by the transfer of 1 or more electrons from one atom to another, NaCl
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Define covalent bond
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Band formed by the sharing of electrons between atoms
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Describe "molecule"
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The smallest unit of most chemical compounds but properties are different.
ex. - NaCl both pronouns |
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Describe van der Waal's forces. Give an example of a creature that uses these forces.
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A slight attraction (b/t + and -) that develops b/t 2 molecular surfaces with matching shapes that are brought very close together.
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