25 terms

Biology - Ch. 2

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____ is the energy due to movement of molecules in a body of matter.
heat
an ____ is a subatomic particle that circles an atom's nucleus.
electron
the smallest particle of an element is called an ____.
atom
an ____ is a charged atom or molecule.
ion
acid ____ is caused by pollutants that combine with water in the air.
precipitation
____ is anything that occupies space and has mass.
matter
2 or more atoms held together by covalent bonds form a ____.
molecule
neutrons and protons are found in an atom's ____.
nucleus
the cohesion of water molecules is responsible for ____.
surface tension
variant forms of an element with different numbers of neutrons are called ____.
isotopes
____ is the tendency of water molecules to stick together.
cohesion
a ____ is a subatomic particle with no electrical charge.
neutron
____ measures the intensity of heat.
temperature
electrons are shared unequally in a ____ covalent bond.
polar
there are 92 naturally occurring ____.
elements
a ____ contains 2 or more elements in a fixed ratio.
compound
weak bonds between water molecules are called ____.
hydrogen bonds
an ____ donates H+ ions to solutions.
acid
a ____ is formed when 2 atoms share electrons.
covalent bond
a ____ is a positively charged particle from the nucleus of an atom.
proton
in a solution, the dissolving agent is called the ____.
solvent
a ____ is liquid containing a uniform mixture of substances.
solution
when 2 ions of opposite charges attract each other, an ____ forms.
ionic bond
the ____ is the substance dissolved in a solution.
solute
a ____ accepts H+ ions and removes them from solution.
base