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Chemical Reactions
Question | Answer |
---|---|
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 |