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chemical bonds, compounds
chemical reactions involve changes in the ________ ______ that join atoms in ___________
a substance that speeds up the rate of a chemical reaction by lowering the activation energy
mass & energy and chemical reactions are conserved during _________ ________
chemical bonds, formed, broken
energy is released or absorbed whenever ________ _____ are either ______ or _______
slow, activation energies, high, catalysts
some chemical reactions that make life possible are too ____ or have ______ ______ that are too ____ to make them practical for living tissue, so are nade possible by a process that cells use involving ______.
reactants, bonds break, bonds form
for a chemical reaction to occur, the _______ must collide with enough energy so that the existing ______ ______ and new ______ ______
controlling chemical pathways, making materials that cells need, releasing energy, transferring information
the four essential roles that enzymes play
because enzymes are ________ for chemical reactions, they can be effected by any variable that influences a chemical reaction
energy absorbing reactions
a chemical reaction where the products have more energy than the reactions
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