Multiple choice

Thermosetting plastics cannot be softened by heating because _____.

  1. they are cross linked polymers with hydrogen bonds between each chain

  2. they are linear chains of polymers

  3. they are large cross linked molecules with strong covalent bonds between the atoms along each chains

  4. they are large cross linked molecules with strong electrovalent bonds between the atoms along each chain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Thermosetting plastics are formed by sharing of electrons. It means that they form a covalent bond between their sub units. Covalent bonds of  their sub-units are very strong. This makes thermosetting plastic a strong cross linked molecule, which becomes hard to break, even by heating. 

Keep practicing — related questions