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33 Cards in this Set
- Front
- Back
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Matter
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Anything that has mass and matter
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All Matter is made of
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atoms or atoms and molecules
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Atom
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the smallest unit of matter that can't be broken down
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Atom consists of thre kinds of particles
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Protons, neutron and electrons
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an element is
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a pure substance made of only one kind of atom
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Elements differ in the number of...
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Protons their atom contains
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the neutron in an atom is often but not usually
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equal to the number of protons in the atom this form isotopes of an atom
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List three elements
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Hydrogen, oxygen, nitrogen
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Chemical Bond
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a force that joins atoms
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A compound is...
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a substance made of the joined atoms of two or more different elements
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Covalent bonds are formed when...
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two or more atoms share electrons to form a molecule
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A molecule is...
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a group of atoms held together by covalent bonds
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The arrangement of an atoms elements determines
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how atoms bond together
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An atom becomes stable when...
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its outer electron level is full
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If the outer electron level is not full then...
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the atom will react readily with atoms that can provide electrons to fill its outer level
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In a water molecule the shared electrons are attracted more strongly by...
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the oxygen nucleus then by the hydrogen nuclei
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A hydrogen bond is...
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a weak chemical attraction between polar molecules
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Water molecules are attracted to each other by...
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Hydrogen bonds
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Some atoms or molecules will...
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gain or loose molecules
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An atom or molecule that has gained or lost one of its electrons...
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is called an ion
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Ions have an electrical charge because...
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they contain an unequal number of electrons and protons
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Ions of opposite charge may interact to form an...
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ionic bond
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Many organisms release heat through
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water evaporation
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In organism the ability to control temperature enables cells to maintain a...
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constant internal temperature when external temperature changes
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Water helps cells maintain...
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homeostatsis
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Cohesion is...
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the attraction between substances of the same kind
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Adhesion is...
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an attraction between different substances
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adhesions powers a process called...
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capillary action
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During capillary action water molecules...
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move upward through a narrow tube such as a stem
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A solution is...
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a mixture in which one or more substances are evenly distributed to another substance
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Because substances can dissolve in water they can...
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move more easily within and between cells
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The polarity of water enables
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many substances to dissolve in water
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When ionic compounds are dissolved in water...
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the ions become surrounded by polar water molecules
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