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33 Cards in this Set

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