Chemistry Questions and Answers

permutit water softener can be regenerated by washing the spent resin with brine( saturated sodium chloride solution). The solution ions replace the calcium or magnesium ions present in it.

\(CaR_{2(s)}\) + 2\(NaCl_{aq}\)  → \(CaCl_{2(aq)}\) + 2\(NaR_{2(s)}\)

Cracking is the breakdown of a large alkane into smaller, more useful alkenes. Simply put, hydrocarbon cracking is the process of breaking a long-chain of hydrocarbons into short ones. This process might require high temperatures and high pressure.

Between the five main minerals found in clay, kaolinite is the most common. Kaolinite holds the chemical composition Al\(_{2}\) Si\(_{2}\)O\(_{5}\)(OH)\(_{4}\) and is an aluminum silicate material with a low “shrink-swell” capacity. It is a soft, white mineral but is often colored orange or red by iron oxide found in the soil.

H \(_2\) S + Cl \(_2\) → 2HCl + S

  Please note: substance oxidized or reduced are always the reactants. So, one can easily cross out the two products.

  Reduction is

  1. Addition of hydrogen

  2. Removal of Oxygen

  3. Addition of Electron

  Oxidation is

  1. Removal of hydrogen

  2. Addition of hydrogen

  3. Removal of Electron

  From the question we can see that H was added to Cl in the product, thereby making hydrogen to be removed from S in the reactant hence S is oxidized as a result of the removal of hydrogen and Cl \(_2\) has been reduced due to addition of hydrogen.

Cl \(_2\) is reduced

The periodic number table is arranged in order of atoms increasing atomic number