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30 Cards in this Set
- Front
- Back
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What is a molecule?
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When two or mor atoms are joined together in specific shapes
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What are the states of matter
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liquid -distinct volume, no shape
solid-distinct shape, distinct volume gas-no fixed volume or shaoe |
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What is a pure substance?
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has distinct properties and doesn't differ from sample to sample
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What are elements?
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cannot be decomposed into smaller substances, each element is one kind of atom
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What are compounds?
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composed of two or more elements
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What is the law of constant composition?
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elemental composition of a pure compound is always the same
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How is the composition of a mixture different from a pure substance
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it can vary
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What is the other term for homogenous mixtures?
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solutions
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What are physical properties?
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can be measured without changing the identitty and the composition of the substances ie color, odor, density, melting point, boiling point, and hardness
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what are chemical properties?
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describe tthe way a substance may change or react to form other substances ie flammability
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How is matter ultimately classified?
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elements or compounds
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What are intensive properties?
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do not depend on the amount of sample being examined
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What are extensive properties?
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depend on the quantity
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What are chemical changes?
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Also known as reactions, it is when a substance os transformed into a chemciallly different substance
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What are the SI units for mass, Length, time, temp, amount of substance?
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kg,m,s,K,mol
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How are Kelvins determined?
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C+273.15
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How many cm are in 1 mL?
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1 cubic cm
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What is density dependent on?
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temp. because most substances change in volume when heated or cooled
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what is precision?
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measure of how closely individual measurements are to one another
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What is accuracy?
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refers to how closely measurments are to the correct answer
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when are 0s significant?
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between non-zero numbers, when there is a decimal place
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What do you do with sig figs when multiplying? addition?
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result contain same number as fewest sig figs, result goes to fewest decimal places
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What is an atom?
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smallest particle that retain the chemical identity
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Decribe the relationship between particles with charges?
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same charge repel, opposite attract
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What does the atomic mass tell us?
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number of protons plus neutrons (top)
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What does the atomic number tell us?
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how many protons
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what are isotopes?
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atoms wiwht identical atomic numbers, but different masses
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What are groups?
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vertical columns
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What happens when two elements are in the same group?
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exhibit similarities in physical and chemcial properties
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What are characteristics of metals?
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all solid except Hg at room temp, conduct electricity
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