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ACT Science Vocabulary #3

Across
Elevations above a level of reference, usually given in feet above sea level.
A natural process by which an atom of a radioactive isotope spontaneously decays into another element. (2 words, no space)
A scale that measures how acidic or basic a substance is on a scale of 0-14. Lower numbers indicate acidity and higher numbers indicate increasing basicity.
The weight of all the atoms in a molecule (2 words, no space)
A process of combustion in which materials in a fuel are broken down into several by products (2 words, no space)
The chemical bonding of atoms where valence electrons are transferred from one atom to another. (2 words, no space)
Having a pH less than 7.
The chemical bonding of atoms where valence electrons are shared between atoms. (2 words, no space)
Down
A direct electric current produced by chemical reactions.
A device used to detect the composition of an unknown material. (2 words, no space)
The chemical bonding of a hydrogen atom with another electronegative atom. (2 words, no space)
A unit of measurement for the molecular weight of a substance.
A man-made, repeating chain of atoms. (2 words, no space)
Having a pH greater than 7.
Two or more atoms with an identical atomic number and differing atomic masses.