Please answer all of the questions and show the short reason

Please answer all of the questions and show the short reason clearly. thank u very much

For the statements below, indicate whether you think they are true (\"I\") or false (\"I\") polymers are made of repeating units called \"mars\" Thermoplastics are ductile because they have long carbon chains Thermoplastics are strong because they have long carbon chains Elastomers have cross links Thermosets are strong because they have cross links Thermoplastics have weak bonds between the carbon chains Thermosets have strong bonds between the carbon chains The elastic strain in polymers comes from the stretching and rotation of the carbon chains Thermoplastics are stiffer than thermosets The plastic strain in polymers occurs when the carbon chains slide past each other The elastomer used to make rubber bands has tyres does not Elastomers stretch because the carbon chains are coiled like springs

Solution

1. FALSE (Polymers are made of monomers)

2. TRUE

3. FALSE (Thermoplastic polymers (thermoplasts) soften reversibly when heated (harden when cooled back)

Thermosetting polymers (thermosets) harden permanently when heated, as cross-linking hinder bending and rotations. Thermosets are harder, more dimensionally stable, and more brittle than thermoplasts)

4. TRUE (Elastomers are usually thermosets (requiring vulcanization) but may also be thermoplastic (see thermoplastic elastomer). The long polymer chains cross-link during curing, i.e., vulcanizing)

5. TRUE

6. TRUE ( Van der wall force between secondary bonds)

7. TRUE (Covalent bond and cross links)

8. TRUE

9. TRUE (high impact strength)

10. TRUE

11.FALSE (Chemical covalent cross-links are stable mechanically and thermally, so once formed are difficult to break. Therefore, cross-linked products like car tires cannot be recycled easily.)

12.