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In chemistry, the coming together, or interaction, of two or more atoms, ions, or molecules with the result that a chemical change takes place and a new substance is formed, with a different chemical composition. The nature of the reaction is described by a chemical equation. For example, in the chemical reaction that occurs when magnesium burns in oxygen, a new substance, magnesium oxide is made:
Chemical equations show the reactants and products of a chemical reaction by using chemical symbols and formulae. State symbols and the energy symbol (ΔH) can be used to show whether reactants and products are solids (s), liquids (l), gases (g), or are in solution (aq); and whether energy has been released or absorbed during the reaction.
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acid rain
activation energy
alkali
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ammonia
base
bauxite
biotechnology
blast furnace
brewing
carbonate
catalyst
chemical equation
chemical equilibrium
collision theory
combustion
competition reaction
conservation of mass
contact process
corrosion (chemistry)
decomposition
denaturation
displacement reaction
ductile
electric charge
electrolysis (chemistry)
electrolyte
endothermic reaction
energy of reaction
energy transfer
enzyme
equation (chemistry)
equation, word
exothermic reaction
fossil fuel
Haber process
haematite
hydroxonium ion
indicator
iron ore
kinetic theory
lime (chemical)
litmus
malleability
metal
metallurgy
mineral extraction
neutral solution
neutralization
nitric acid
ore
oxidation (chemistry)
particle theory
pH
photosynthesis
precipitation (chemistry)
rate of reaction
reaction
reactivity series
redox reaction
reduction
respiration
reversible reaction
rust (chemistry)
sacrificial metal
salt
slag
smelting
smoke
sonorous
steel
sulphuric acid
universal indicator
yield (chemistry)
acid rain
activation energy
alkali
aluminium
ammonia
base
bauxite
biotechnology
blast furnace
brewing
carbonate
catalyst
chemical equation
chemical equilibrium
collision theory
combustion
competition reaction
conservation of mass
contact process
corrosion (chemistry)
decomposition
denaturation
displacement reaction
ductile
electric charge
electrolysis (chemistry)
electrolyte
endothermic reaction
energy of reaction
energy transfer
enzyme
equation (chemistry)
equation, word
exothermic reaction
fossil fuel
Haber process
haematite
hydroxonium ion
indicator
iron ore
kinetic theory
lime (chemical)
litmus
malleability
metal
metallurgy
mineral extraction
neutral solution
neutralization
nitric acid
ore
oxidation (chemistry)
particle theory
pH
photosynthesis
precipitation (chemistry)
rate of reaction
reaction
reactivity series
redox reaction
reduction
respiration
reversible reaction
rust (chemistry)
sacrificial metal
salt
slag
smelting
smoke
sonorous
steel
sulphuric acid
universal indicator
yield (chemistry)
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