Chemical reactions

Classify the following reactions as synthesis (S), decomposition (D), single-replacement (SR) or double-replacement (DR)
  1. Al2(SO4)3+3BaCl23BaSO4+2AC3Al_2(SO_4)_3+3BaCl_2\to3BaSO_4+2A\ell C\ell_3
  2. Al2S32Al+3SAl_2S_3\to2Al+3S
  3. 2NaOH+CuSO4Na2SO4+Cu(OH)22NaOH+CuSO_4\to Na_2SO_4+Cu(OH)_2
  4. Fe+H2SO4FeSO4+H2Fe+H_2SO_4\to FeSO_4+H_2
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