What element are both diamond and graphite mainly made of?
Which metal is commonly used to make pressure cookers?
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A. Aluminium
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C. Mercury
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B. Silver
What is mainly needed for iron to rust?
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C. HβO
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A. Nitrogen
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B. Oxygen and Water
Which metal is commonly used in the tip of an electrical plug?
What is the chemical name of common table salt?
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A. Sodium chloride
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C. Salt
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B. Sodium Carbonate
Which substance can be used to kill germs during water treatment?
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B. Oil
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A. Chlorine
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C. Sodium
Which metal is strongly attracted to a magnet?
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C. Iron
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A. Nickel
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B. Cobalt
What is the main raw material used to make ordinary glass?
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A. Diamond
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C. Shine Stone
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B. Silica
Which metal helps stainless steel resist rust?
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A. Sodium
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B. Mercury
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C. Chromium
Which material is commonly used as the base of a mirror?
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B. transparent glass
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A. Hard glass