Concept explainers
(a)
Interpretation :
Reactants and products must be identified along with chemical equation when silicon is produced along with carbon dioxide from silicon dioxide and carbon.
Concept Introduction :
Carbon is a reducing agent which reduces silicon dioxide to silicon and itself oxidized to carbon dioxide.
(a)
Answer to Problem 1RQ
The reactants are silicon dioxide (SiO2) and carbon (C). Products are silicon (Si) and carbon dioxide (CO2).
Explanation of Solution
The
From the reaction it is clear that solid Si is produced by reduction of SiO2 with C. C is oxidized to CO2.
b)
Interpretation :
Reactants and products must be identified along with chemical equation when ammonium chloride is heated with sodium hydroxide to produce ammonia gas water vapor and sodium chloride.
Concept Introduction :
Any ammonium salt when heated with alkali produces ammonia gas, salt and water vapor.
b)
Answer to Problem 1RQ
The reactants are ammonium chloride (NH4Cl) and sodium hydroxide (NaOH). Products are ammonia (NH3), water vapor (H2O) and sodium chloride (NaCl).
Explanation of Solution
From the reaction it is clear that ammonia (NH3) water vapor (H2O) and sodium chloride (NaCl) are produced from ammonium chloride (NH4Cl) and sodium hydroxide (NaOH).
c)
Interpretation :
Reactants and products must be identified along with chemical equation when calcium oxide absorbs moister from air to produce calcium hydroxide.
Concept Introduction :
Calcium oxide is base which can produce alkali after dissolving in water.
c)
Answer to Problem 1RQ
The reactants are calcium oxide (CaO) and water (H2O). Products is calcium hydroxide
Ca (OH) 2.
Explanation of Solution
From the reaction it is clear that solid calcium oxide (CaO) absorbs water vapor (H2O) and produces calcium hydroxide Ca (OH) 2 after dissolving in the water. CaO is very much hygroscopic.
Chapter 7 Solutions
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