Write the balanced chemical equation for the following:
a) Reaction involved in black and white photography
b) Heating of zinc carbonate in absence of air
c) Cuprous oxide and cuprous sulphide are heated together
d) Reaction between Iron(III) Oxide and aluminium
e) Dissolving hydrochloric acid in water
Answers
Answer:
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Explanation:
a. The reactions used in black and white photography are decomposition reactions.
b.When zinc carbonate is heated in absence of air leaves zinc oxide and gives out carbon-dioxide. This process is also called calcination.
c.- When cuprous oxide is heated with cuprous sulphide, copper metal is obtained. - In this reaction, SO2 gas is released as byproduct with its peculiar smell.
d. The equation for this reaction is: 2 Al(s) + Fe 2O 3(s) --> 2Fe (s) + Al 2O 3 (s). ... The enthalpy change of this reaction is about -850 kJ/mol! The heat generated melts the iron and the aluminum oxide which pour out of the hole in the bottom of the pot.
e. HCl is a strong electrolyte and when it dissolves in water it separates almost completely into positively - charged hydrogen ions and negatively - charged chloride ions. ... The ions are surrounded by water molecules, like the sodium and hydroxide ions above, but hydrogen ion has a special relationship with water.
Explanation:
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