It looks like you've provided several chemical reactions. Let's examine each reaction you've written:
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Decomposition of Water: \[ 2H_2O \rightarrow 2H_2 + O_2 \] This reaction shows the decomposition of water (H₂O) into hydrogen (H₂) and oxygen (O₂) gas.
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Combustion of Ethane: \[ 2C_2H_6 + 7O_2 \rightarrow 4CO_2 + 6H_2O \] This is the complete combustion of ethane (C₂H₆) with oxygen, producing carbon dioxide (CO₂) and water (H₂O).
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Synthesis of Sodium Chloride: \[ 2Na + Cl_2 \rightarrow 2NaCl \] This reaction depicts the formation of sodium chloride (NaCl) from sodium (Na) and chlorine (Cl₂).
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Combustion of Aluminum Bromide: \[ 4AlBr_3 + 3O_2 \rightarrow 2Al_2O_3 + 6Br_2 \] This reaction involves aluminum bromide (AlBr₃) reacting with oxygen (O₂) to produce aluminum oxide (Al₂O₃) and bromine (Br₂).
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Double Displacement Reaction: \[ KCl + NaI \rightarrow KI + NaCl \] This is a double displacement reaction where potassium chloride (KCl) reacts with sodium iodide (NaI) to form potassium iodide (KI) and sodium chloride (NaCl).
If you have specific questions about these reactions or if you're interested in something particular, please let me know!