This question is about glass and polymers.
Reagent bottles used in laboratories can be manufactured from either borosilicate glass or poly(propene). Table 1 contains physical and economic properties of these two materials.
| Property | Borosilicate glass | Poly(propene) |
|---|---|---|
| Temperature at which softening/melting begins (∘C^\circ\text{C}∘C) | 820 | 160 |
| Flammability | Non-flammable | Flammable |
| Resistance to impact | Brittle (shatters easily) | High impact resistance (tough) |
| Cost of one bottle | £4.50£4.50£4.50 | £6.20£6.20£6.20 |
Suggest two reasons why a laboratory technician should not use a direct flame to sterilize a poly(propene) bottle. Use Table 1.
Poly(propene) bottles are more expensive than borosilicate glass bottles. Suggest one reason why using poly(propene) bottles instead of borosilicate glass bottles could save the laboratory money over time. Use Table 1.
Propene (C3H6)(\text{C}_3\text{H}_6)(C3H6) is polymerized to make poly(propene). The displayed formula of propene is:
HH\/C =C/\HCH3\begin{array}{cc} \text{H} & \text{H} \\ \backslash & / \\ \text{C} & \!\!=\text{C} \\ / & \backslash \\ \text{H} & \text{CH}_3 \end{array}H\C/HH/=C\CH3
Which of the following structures represents the repeating unit of poly(propene)?
Structure A: [HH∣∣−C−C−∣∣HCH3]n\left[ \begin{array}{cc} \text{H} & \text{H} \\ | & | \\ -\text{C} & -\text{C}- \\ | & | \\ \text{H} & \text{CH}_3 \end{array} \right]_nH∣−C∣HH∣−C−∣CH3n
Structure B: [HH∣∣−C−C−∣∣HH]n\left[ \begin{array}{cc} \text{H} & \text{H} \\ | & | \\ -\text{C} & -\text{C}- \\ | & | \\ \text{H} & \text{H} \end{array} \right]_nH∣−C∣HH∣−C−∣Hn
Structure C: [FF∣∣−C−C−∣∣FF]n\left[ \begin{array}{cc} \text{F} & \text{F} \\ | & | \\ -\text{C} & -\text{C}- \\ | & | \\ \text{F} & \text{F} \end{array} \right]_nF∣−C∣FF∣−C−∣Fn
Many propene molecules join together to form poly(propene). Which two words describe a propene molecule in this polymerization process?