Chemistry
What happens when an electron moves nearer to the nucleus of the atom?
The energy decreases
What are isotopes?
Atoms having the same atomic number but a different mass number.
Which element can easily form chains?
Carbon
Which element has no neutrons in it?
Hydrogen
Cement mixed with gravel, sand, and water is called what?
Concrete
Which element on adding to natural rubber makes it less sticky in hot weather and less hard in cold weather?
Sulfur
Which chemical causes Minamata disease?
Mercury
What are isobars?
Same mass number but a different atomic number.
Give the name of the radioactive isotope of hydrogen:
Tritium
What is Isotone?
Atoms having an equal number of neutrons.
Which is the most widely used metal?
Iron
Which is the metal as strong as steel but half as much in weight?
Titanium
What kind of thermometer is used to determine the depression of freezing point?
Beckmann thermometer.
Which is the most stable compound?
Sodium Hydroxide
Which fuel produces the maximum heat per gram burnt?
Bronze is an alloy of what?
Tin and Copper
How would you know that a chemical is pure or not?
Check its melting point
Which material is used in display devices, such as digital watches?
Liquid crystal
What is the purest form of iron?
Wrought iron
What is an amalgam?
Mixture of mercury and metal
Which is considered to be an anomalous compound?
Water
Which mineral is used making plaster and paper?
Gypsum
Which metal is extracted by the Mond process?
Nickel
Which elements impact corrosion resistance to steel?
Nickel
Which drug is present tobacco?
Nicotine