I need definitions for chemistry and I can't

come up with any

heterogeneous reaction
homogeneous reaction
activation energy
activation energy
activated complex
elementary reaction

3 answers

Heterogeneous reaction - a chemical reaction in which the reactants are in different phases. Some examples are,
Liquid-solid: alkylation with AlCl3 catalyst
Gas-liquid: gas absorption with reaction
Gas-liquid-solid: hydrogenation of liquids

Homogeneous reaction - a chemical reaction in which the reactants are in the same phase.

Activation energy (Ea) - minimum energy required in order to initiate a certain chemical reaction. In collision theory, even if the reactants are in proper orientation and collided, they still won't react if they don't have enough Ea.
Activated complex - a species in a transition state. (not sure about this one though)

Elementary reaction - a reaction in which the stoichiometric coefficients in the balanced chemical reaction is equal to the exponents used the rate equation, or (if that isn't very clear), elementary reactions follow simple rate laws for we can determine it directly from the chemical reaction. For example,
rA + sB -> tC
rate law: rA = -k * (A)^r * (B)^s

hope this helps~ `u`
I think it's nice that you can get someone to do your work for you but I don't understand why you can't look up these definitions in your text/notes and if you don't have text/notes use Google.
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