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Chemical Reactions

QuestionAnswer
What is an endothermic reaction? the chemical energy of the reactants is less than the energy of the products. this reaction is usually cooler.
what is and exothermic reaction? the chemical energy of the reactants is greater than the energy of the products. this reaction is usually warmer.
exothermic examples combustion reactions liquid-solid respiration firefly glow glowstick chemiluminescent
endothermic examples electrolysis photosynthesis solid-liquid
diatomic atoms H, O, N, I, F, Br, Cl
synthesis when 2 or more substances form to make a new simpler substance.
decomposition when a complex substance breaks down into two or more simpler substances.
single replacement a chemical reaction when a single uncombined element replaces and element that is part of a compound.
double replacement when different atoms in two different compounds replace each other.
what can change the rate of a chemical reaction? concentration, surface area, catalyst, temperature
law of conservation of mass ‘in a chemical reaction atoms are neither created or destroyed. All atoms present in the reactants are also present in the products.
who invented the law of conservation of mass Antoine Lavoisier
Created by: Helena18