Worksheet M.1

Exploring Materials

I. Multiple choice. Circle the correct answer.1. Any large molecule made of many monomers is called a __________. a) plastic b) polymer c) protein d) chain

2. Fiberglass is a type of __________. a) polymer b) alloy c) ceramic d) composite

3. Which of the following is not an example of an alloy? a) brass b) bronze c) stainless steel d) iron

4. Clean sand is heated to its melting point to make __________. a) ceramics b) glass b) alloys d) composites

5. Nuclear power is an example of use of __________. a) radioactive isotopes b) alloys c) polymers d) monomers

II. Completion. Fill in the sentences with the correct word(s). Be aware that one word is not used:

ceramics glass half-life plastics radioactive decay steel

6. Polymers that are made by people and that can be molded and shaped are called _________.7. An alloy made of iron and carbon is _______________.8. Heating clay mixed with other minerals forms hard solids called _________________.9. The process in which atomic nuclei give off atomic particles and energy is called __________.10. The length of time it takes for half of the atoms in a radioactive sample decay is called _________________.

III. True or False.11. A monomer is a large compound built from smaller compounds joined in a repeating pattern. __________ 12. Plastics are cheap to make and last for a long time in the environment. __________13. Pure gold is too soft to use for making jewelry. __________14. Ceramics melt at low temperatures. __________ 15. Radioactive isotopes are useful because they can change into new elements.__________

IV.Science skills. Use the diagrams below to answer the questions. 16. Which diagram shows a straight carbon chain? a) Diagram A b) Diagram B c) Diagram C d) Diagram A and C

17. How many chemical bonds can carbon form? a) 1 b) 3 c) 4 d) 6

18. How many isotopes of Bismuth (Bi) are formed in the decay?

a) 1b) 2c) 3d) 4

19. What is the part of the atom labeled ‘A”?

a) Electron cloudb) Nucleusc) Plasmad) Neutron

V. Answer the questions.20. What is the pressure if a force of 2000N acts on an area of 5 m2?

____________________________________________________________________

21. Explain why some advantages of using synthetic polymers can become disatvantages? ____________________________________________________________________

22. Explain which material – steel, glass or polystyrene foam – would be the best choice for each of the following uses: a hammer, the wall of a saltwater aquarium, an egg carton. ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________