Explanation:
Graphite conducts electricity due to delocalized electrons in its structure and is chemically inert, allowing its use in electrodes for electrolysis and batteries. Diamond is an insulator. Hardness is not the reason; graphite is soft. It is opaque and black. Graphite electrodes are used in arc furnaces.
Explanation:
Two or more substances combine to form a single product: N₂ + 3H₂ → 2NH₃. This is a combination (synthesis) reaction. Decomposition involves a single compound breaking down. Displacement: one element displaces another. Double displacement: exchange of ions. The Haber process for ammonia is also a redox and reversible reaction. Combination can be exothermic.
Explanation:
Washing soda is sodium carbonate decahydrate, with the chemical formula Na₂CO₃·10H₂O. Sodium bicarbonate is baking soda (NaHCO₃). Sodium hydroxide is caustic soda (NaOH), and sodium chloride is common table salt (NaCl). Washing soda is used for cleaning and water softening.
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