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25 Cards in this Set
- Front
- Back
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Atoms in molecular compounds share _________.
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electrons
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All of a ___________ mixture has the same composition.
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Homogeneous
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When an atom loses an electron, it's a _________ ion.
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positive
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What is ductile?
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The ability to be pulled into wires.
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What does it mean to conduct electricity?
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It means that the element will allow a flow of electrons.
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Protons in a nucleus are held together by ____________ force.
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nuclear strong
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Iron
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1. malleable
2. conducts heat and electricity 3. ductile |
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Mercury
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1. liquid at room temp
2. silvery 3. poisonous gas |
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Ionic compounds tend to be ___________.
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solids
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Molecular compounds tend to be _______.
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liquids and gases
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Zinc 64 and Zinc 66 are different ________.
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isotopes
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Isotope
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Atoms of the same element that have different #s of neutrons
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Structure of atom
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Protons (positive) and neutrons (neutral)in the nucleus and electrons (negative) are in surrounding electron cloud on energy levels.
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Atomic #
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. # on protons in the atom
. indentifies the atom |
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Carbon 14
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. found in all living things and is used to date organic artifacts
. C14 decays into C12 which is more stable . measure the ratio of C14 to C12 to dtermine the age of sample |
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Mass #
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. total # of protons and neutrons
. aren't whole #s because they're averages based on isotopes |
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Atomic Mass Unit
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. based on Carbon atom
. 1/2 the mass of Carbon atom |
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Ion
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an atom of group of atoms that gains of loses an electron`
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compound
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a substance made of 2 or more elements, chemical combined
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Molecular Compounds
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particle held together by sharing of electrons
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Ionic Compound
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charged particle formed when an atom of group of atoms gains or loses an electron
(exchange) |
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Mixture
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when 2 or more substances are not chemically compbined, but are mixed together physically
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Homogeneous
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All parts contain the same amount of each component
ex: grape juice, chocolate milk, alloy |
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Heterogeneous
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Not all parts of mixture contain same amount of each component
ex: salt and pepper, seasoning mix, raisen bran cereal |
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Compouds vs. Mixtures
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. Compounds don't vary in composition, mixtures do
. Compounds chemically combine, mixtures don't . Compounds don't keep it's element's original properties, mixtures do . Compounds can only be seperated chemically, mixtures can be seperated physically |
