types of chemical reactions. chemical reactions grouped into categories based on reactions following...
TRANSCRIPT
Types of Chemical Reactions
Chemical Reactions
• grouped into categories• based on reactions following the same pattern
Synthesis• two simple reactants combine to make a
larger or more complex product• the general pattern is:
A + B AB• the reactants can be either atoms (elements)
or molecules (elements or compounds)
ExamplesSynthesis reaction Equation
zinc sulfide zinc + sulfur zinc sulfideZn(s) + S(s) ZnS (s)
sodium chloride sodium + chlorine sodium chloride Na(s) + Cl2(g) NaCl (s)
ammonium chloride ammonia + hydrogen chloride ammonium chloride NH3 (g) + HCl (g) NH4Cl (s)
GENERAL PATTERN A + B AB
produces zinc sulfide powder
produces sodium chloride
produces cloudy white ammonium chloride powder
Decomposition• large compounds broken down into smaller
compounds or elements• the general pattern is:
AB A + B• often absorb energy from external source and
converts products into reactants
• decomposition happens when the stability of a chemical compound is limited by exposure to an adverse condition
• examples include heat, radiation, humidity or the acidity of a solvent
ExamplesDecomposition Reaction Equation
water energy + water hydrogen + oxygen H2O(l) H2 (g) + O2 (g)
sodium azide energy + sodium azide sodium + nitrogen NaN3 Na (s) + N2 (g)
GENERAL PATTERN AB A + B
http://www.youtube.com/watch?v=dZfLOnXoVOQ
Homework: p. 239 #1,2,4