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CHEMISTRY

Chemistry
The graphite rods in the nuclear reactor

produce neutrons
react with U to release energy
convert fast moving neutrons into thermal neutrons
undergo combustion which triggers the nuclear fission

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Chemistry
The first metal used by man was

iron
copper
gold
bronze

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Chemistry
The hydronium ion is

H+
H3O+
HO -
H2+

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Chemistry
The most electropositive elements among the following is

K
Na
Cs
Ca

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Chemistry
The method that cannot be used for removing permanent hardness of water is

adding sodium carbonate
adding caustic soda
distillation
boiling

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