(a) This is because at solid state, the ions in magnesium oxide are fixed in their position and cannot move around to carry charge, hence, magnesium oxide is an insulator at the solid state.
(b) This is because magnesium oxide has a higher melting point (remember, it is used in the fire alarm system)
(c) This is because copper is less reactive than magnesium, even at high temperature, copper cannot react with magnesium oxide
(a) This is because at solid state, the ions in magnesium oxide are fixed in their position and cannot move around to carry charge, hence, magnesium oxide is an insulator at the solid state. (b) This is because magnesium oxide has a higher melting point (remember, it is used in the fire alarm system) (c) This is because copper is less reactive than magnesium, even at high temperature, copper cannot react with magnesium oxide
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