15 terms

7th Grade Science: Classes, Energy, and pH of Chemical Reactions

Vocabulary list for the 7th grade chemical experimental design module
chemical bond
An attractive force that holds together the atoms in a molecule.
covalent bond
chemical bond formed when two atoms share one or more electrons
ionic bond
chemical bond formed when one atom gains and a second atom loses electrons
single displacement
a reaction in which one element takes the place of another element in a compound
double displacement
a reaction where 2 reactants exchange places
decomposition reaction
a reaction where the compound breaks down to form two or more simpler substances
synthesis reaction
a reaction in which two or more substances combine to form a new compound
a chemical reaction that absorbs energy
A chemical reaction that releases energy
a solid that forms as a result of mixing two solutions
a chemical substance that is corrosive is tart or sour-tasting and has a pH of less than 7
a chemical substance that feel slippery when dissolved in water, is bitter tasting, and has a pH greater than 7
a compound that changes color when placed in an acid or base
a measure of how acid or basic a solution is
substance that speeds up the rate of a chemical reaction