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20 Cards in this Set
- Front
- Back
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What are trace elements?
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elements that are essential to your body but only in minute quantities (Ca, P, K, S, Na, Cl, Mg)
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What is the structure of an atom?
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protons, neutrons, and electrons
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What is an isotope?
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atoms of an element that differ in mass number due to the number of neutrons.
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What is a radioactive isotope?
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one in which the nucleus decays spontaneously giving off particles and energy. easy to trace.
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What are nonpolar covalent bonds?
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bonds in the molecule have equal pull on each other
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What are polar covalent bonds?
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bonds pull in a way so that the molecule is partially positively charged and partially negatively charged.
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What is an ionic bond?
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Two ions with opposite charges attract each other
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What is a hydrogen bond?
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weak bonds consisting of a partially positive charge that attracts to a partially negative charge.
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What are water's life supporting properties?
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cohesion, adhesion, surface tension
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What is cohesion?
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the tendency of molecule of the same kind to stick together
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What is adhesion?
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the clinging of one substance to another. (in plant veins)
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What is surface tension?
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the measure of how difficult it is to stretch or break liquid
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Why is ice less dense than water?
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The ice molecules are further apart.
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What is evaporative cooling?
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when a substance evaporates, the surface of the liquid that remains behind cools down.
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What is a solution?
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a liquid consisting of a uniform mixture of two or more substances
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What is a solvent?
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the dissolving agent (water)
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What is a solute?
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the substance that is dissolved (salt)
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What is an acid?
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a compound that donates hydrogen ions to solutions
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What is a base?
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a compound that accepts hydrogen ions
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Describe the pH scale.
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7 is neutral, pure water
<7 is acidic >7 is basic |
