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Related Flashcards
Cards In This Set
| Front | Back |
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All structures of life are ultimately composed of
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Chemicals
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Matter has ______ and takes up ________.
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Mass, space
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What is mass?
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Amount of matter a substance contains
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What is weight?
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Force of gravity acting on a mass (can change depending on gravity).
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The elements Oxygen, Carbon, Hydrogen and Nitrogen make up what percentage of living matter?
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96%
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What does the other 4% come from?
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3.9% Calcium (Ca), Phosphorus (P), Potassium (K), Sulfur (S), Sodium (Na), Chlorine (Cl), Magnesium (Mg), Iodine (I), and Iron (Fe).
0.01% trace and ultratrace elements. |
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What is an atom?
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An electrically neutral unit of matter of all elements.
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What is the nucleus comprised of?
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Protons and neutrons
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How are the electrons positioned?
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In energy level orbitals
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If the number of protons equals the number of electrons, the atom is
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Electrically neutral
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What is an element?
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A substance that is made entirely from one type of atom. (ex, hydrogen, gold, silver, copper, carbon)
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The atomic number is
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Is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus
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The mass number is
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The total number of protons and neutrons in the nucleus
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The atomic weight is
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The average mass number of all natural isotopes.
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What are bonds?
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Links that attach atoms together
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