Question
(f) Which m etal is found in the Earth as the metal itself? Tick one box. Calcium square Gold square Lithium square Potassium square (g) Iron is found in the Earth as iron oxide (Fe_(2)O_(3)) Iron oxide is reduced to produce iron. Balance the equation for the reaction. underline ( )Fe_(2)O_(3) +underline ( )C arrow underline ( )Fe +underline ( )CO_(2) (h) Name the el ement used to reduce iron ox ide. (1) (i) What is meant by reductio n? Tick one box. square Gain of oxide square square Loss of oxygen square
Answer
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Answer
(f) Gold(g) Fe2O3 + 3C → 2Fe + 3CO2(h) Carbon(i) Loss of oxygen
Explanation
(f) The question is about the occurrence of various metals. Some metals can be found directly as elements in nature whereas few others are available only in the form of compounds. Gold can be found as nuggets sheathed in rock formation, river floor etc. It does not typically combine with other substances, making it one of the few elements that can be found naturally occurring in its pure form. (g) Balanced equation parts (reactants and products) each must individually total the same number of each atomilstoms of each atom. Fe2O3 means there are 2 Fe atoms and 3 O atoms on one side of the equation.(h) The reducing agent is the element or compound that loses or "donates" its electron in the oxidation-reduction or redox process, and by consequence causes the other substance to be reduced.(i) A reduction reaction is a reaction where a chemical species loses oxygen.