Name the following. (5) (a) A metal used in packaging. (b) Non metal that prevents tooth decay. (c) Non metal used at the tip of drills. (d) A catalyst which increases the rate of a chemical reaction. (e) Gas released when potassium chlorate is heated.
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- Metal packaging such as aluminum, tinplated steel and tin-free steel has been used since the 1900s. Metals also have good barrier properties. They can be heat-treated and sealed for sterility. Aluminum made into foil can be made into light, seamless cans for soft drinks.
- Tooth-colored fillings are made of a blend, or “composite,” of plastic resins and silica fillers. These substances mimic many of the qualities of natural tooth structure, such as wear-resistance and translucency. Dental composites also help strengthen teeth.
- The top part of the seed drill is called 'shank'.
- Some metals, for example, copper platinum, and iron can act as catalysts in certain reactions. In our own bodies, we have enzymes that are catalysts, which help to speed up biological reactions.
- When KClO3 (Pottasium Chlorate) is heated strongly, it breaks down, releasing oxygen gas and leaving behind a thermally stable (i.e., heat-insensitive) solid residue of an ionic potassium compound.
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