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Dorling Kindersley Science Encyclopedia Work/Review Sheets

SEMIMETALS

Read each question and circle the letter of the best answer.
NOTE: Some questions may have more than one "correct" answer - think carefully about what you have read, and choose the most complete one.

1.Most chemical elements have definite properties as either metal or non-metal, but some are in between. They are the...
A) Semimetals. B) Pseudo-metals. C) Micrometals. D) A, B & C.

2.What is the most important use of semimetals?
A) Microchips. B) Semiconductors. C) Electronic components. D) A, B, & C.

3.Why are solar cells used on satelites?
A) Ordinary batteries wouldn't last long. B) They convert the energy of sunlight into electricity. C) They can be positioned to always face the sun. D) A, B and C.

4.What are solar cells made of?
A) Salicilic acid. B) Silly putty. C) Silicon. D) A, B & C.

5.Which semimetal is added to sand to make heat proof glass?
A) Quartz. B) Boron. C) Arsenic. D) A & C.

6.Substances that can be either conductors or insulators are called...?
A) Train conductors. B) Semi conductors. C) Semi insulators. D) A, B & C.

7.Semiconductors are used to create diodes & transistors which can do what with electric current?
A) Pass. B) Strengthen. C) Block. D) A, B & C.

8.What device in a compact disc player utilizes semimetals?
A) The laser. B) The mirror. C) The case. D) A, B & C.

9.What is the laser?
A) A semiconductor. B) A diode. C) A compound of arsenic. D) A, B & C.

10.Microchips, used in electronic equipment, have how many electronic components crammed into them?
A) Hundreds. B) Thousands. C) Millions. D) A, B & C.

11.What is the most plentiful solid element on Earth?
A) Clay. B) Silicon. C) Feldspar. D) A, B & C.

12.Semimetals fall between metals & non metals on the periodic table. How many semimetals are there?
A) 8. B) 109. C) 7. D) 33.33.

What more can you say about MATTER now?________________________________________________________________________________
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Matter18 Š1999-2001 Sassafrass Grove Homeschool

NOTE: These work/review/related-activity sheets are for use with the DK Science Encyclopedia as a 12 part science study. The first portion of the initial section, "Matter" is presented here. More will be added as time permits. If you find errors or see need for additions, please contact us at the e-mail address provided at the bottom of this page.

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