Question

1. describe write skeleton equations for these reactions.

a. heating copper(ii) sulfide in the presence of diatomic oxygen produces pure copper and sulfur dioxide gas.
b. when heated, baking soda (sodium hydrogen carbonate) decomposes to form the products sodium carbonate, carbon dioxide, and water.

Explanation:

Part (a)

Step 1: Identify reactants and products

Reactants: Copper(II) sulfide ($\ce{CuS}$) and diatomic oxygen ($\ce{O2}$) (under heating condition).
Products: Pure copper ($\ce{Cu}$) and sulfur dioxide gas ($\ce{SO2}$).

Step 2: Write the skeleton equation

Combine reactants on the left and products on the right with a reaction arrow.
$\ce{CuS(s) + O2(g) ->[\Delta] Cu(s) + SO2(g)}$

Part (b)

Step 1: Identify reactants and products

Reactant: Sodium hydrogen carbonate ($\ce{NaHCO3}$) (under heating condition).
Products: Sodium carbonate ($\ce{Na2CO3}$), carbon dioxide ($\ce{CO2}$), and water ($\ce{H2O}$).

Step 2: Write the skeleton equation

Combine reactant on the left and products on the right with a reaction arrow (indicating heating).
$\ce{NaHCO3(s) ->[\Delta] Na2CO3(s) + CO2(g) + H2O(l)}$

Answer:

s:
a. $\boldsymbol{\ce{CuS(s) + O2(g) ->[\Delta] Cu(s) + SO2(g)}}$
b. $\boldsymbol{\ce{NaHCO3(s) ->[\Delta] Na2CO3(s) + CO2(g) + H2O(l)}}$