Basic Matter
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Basic Matter
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1. A measure of the degree of increase in dimension when an object is heated. This can be measured by an increase in the length (m) - area (m2) or volume (m3). The expansivity can be measured as a fractional increase in dimension per Kelvin increase in

2. Bond that shares electrons in order to complete part- filled shells

3. The ability of a material to withstand pulling forces

4. Fixed volume and fixed shape

5. A measure of how fast heat is conduct through a slab of material with a given temperature difference across the slab. Unit: W/m C (W = watts - m = metres - C = Celsius)

6. Thermosets and thermoplastics

7. Vegetable and meat origin

8. A positively or negatively charged atom or molecule caused by he loss or gain of electrons from an atom or atoms

9. Earthenware - porcelain - stoneware and glass

10. Formed when the fluctuating electrostatic charge in adjacent atoms of different molecules produces a weak electrostatic force between the molecules. Also present as a secondary bond between the long- chain molecules of polymers.

11. No fixed volume and no fixed shape

12. A mixture composed of two or more substances (materials) with one substance acting as the matrix or glue

13. 1) Thermoplastics plastics 2) Thermoset plastics 3) Elastomers

14. A substance made of only one element or compound

15. The smallest part of an element that can exist chemically

16. Caused by an attraction between the positively charged metal atom nuclei and the negatively charged cloud of free electrons. Free electron allows metals to be a good thermal and electrical conductors and let the bond not fixed in position

17. The ability of a material to be drawn or extruded into a wire or other extended shape.

18. 1)reinforced plastics 2)Metal- matrix composites 3)Ceramic- matrix composites 4)sandwich structures 5)concrete

19. Ferrous and non - ferrous

20. V = IR (V= voltage - I = current - R = resistance). unit - Ohms

21. Two or more atoms which are normally bonded together covalently

22. 1) Ferrous metals and alloys (irons - carbon steels - alloy steels - stainless steels - too and die steels) 2) nonferrous metals and alloys (aluminum - copper - magnesium - nickel - titanium - precious metals - refractory metals - super alloys)

23. A substance that cannot be decomposed into simpler substances

24. Bond between adjacent oppositely charged ions

25. A substance formed by the combination of elements in fixed proportions

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