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what is a substance in which the atoms of two or more elements are combined in a fixed proportion compound
substances that prevent certain chemical reactions are called inhibitors
a substance that speeds up a chemical reaction without undergoing a permanent change itself is an what? catalyst
a chemical reaction in which two or more substance combine to form another substance is a what kind of reaction? synthesis
the breaking down of a substance into tow or more substances is a what? decomposition
according to the law of conservation of mass, how does the mass of the products in a chemical equation compare with the mass of the reactants? the masses are equal
what is an insoluble solid that forms as the result of a double displacement reaction called a precipitate
what is a mixture that has the same composition, color, and density throughout? a solution
adding more solute to a solvent does what to the solvent? raises its boiling point
what would increase the solubility of a gas in a liquid increase the pressure. decrease the temperature
a dilute solution has a ....... of solute in the solvent small amount
one commonly used precise way to describe concentrations of solutions is to state the percentage by volume of the solute
the maximum amount of a solute that can be dissolved in a given amount of solvent is its solubility
the type of radioactive particle that can be stopped by a sheet of paper is the alpha particle
the most penetrating type of radiation is the gamma rays
a helium nucleus with two protons and two neutrons is called a alpha particle
protons in the nucleus are attracted to each other by the strong force
the process of nuclear decay is known as radioactivity
negatively charged particles emitted from a nucleus at a high speed are beta particles
the process by which nuclei haiving low masses are united to form nuclei having low masses are united to form nuclei with a larger mass is nuclear fusion
both a fusion reaction a fission reaction do what when their together? produce energy