Worksheet Chapter 8: Manufactured Substances in Industry

1. Fiberglass is a composite material made of plastic polymer matrix reinforced with glass fibers. State two physical properties of fiberglass that make it superior to plastic alone.

2. True or False: Advanced ceramics are good electrical conductors at room temperature.

3. Photochromic glass is used to make sunglasses lenses that automatically darken in sunlight. (a) Identify the reinforcement substance present in photochromic glass. (b) Describe what happens when light intensity drops.

4. Fill in the blank: The main metal component present in bronze is ________.

5. True or False: Soda-lime glass has a higher thermal shock resistance than borosilicate glass.

6. Reinforced concrete is constructed by embedding steel rods into concrete slurry. (a) Name the matrix component and reinforcement component. (b) State the mechanical advantage gained by combining these two materials.

7. Explain, using the arrangement of atoms, why pure copper is malleable whereas brass is hard and strong.

8. Compare Superconductors and Standard Copper Conductors in terms of electrical resistance and critical temperature requirements.

9. Name two metals added to iron to produce stainless steel, and state one advantage of stainless steel over pure iron.

10. Which of the following glass types contains lead(II) oxide to increase its refractive index?