Chemical Reactions

Chemistry · रासायनिक अभिक्रियाएं · 15 facts

Chemical reaction: reactants convert to products with new properties

Signs: colour change, gas evolution, temp change, precipitate

Combination: A+B->AB; Decomposition: AB->A+B

Displacement: more reactive replaces less; Zn+CuSO4->ZnSO4+Cu

Double displacement: ion exchange; NaCl+AgNO3->AgCl+NaNO3

Oxidation: gain O/lose H/lose electrons

Reduction: lose O/gain H/gain electrons

Redox: oxidation+reduction together; rusting is redox

Rusting: Fe+O2+moisture->Fe2O3; prevent by paint/galvanize/oil

Rancidity: fat/oil oxidation; prevent by antioxidants, N2 packing

Exothermic: releases heat(burning); Endothermic: absorbs(photosynthesis)

Catalyst: changes rate without being consumed; enzymes are bio-catalysts

Conservation of Mass: reactant mass = product mass (Lavoisier)

Balanced equation: equal atoms each side

Corrosion: slow metal destruction by environment; green on copper