Give reasons for the followings:
(5)
a) Metals like copper and iron are used for making cooking utensils and water boilers.
b) Graphite is used in batteries.
c)The blue colour of copper sulphate solution disappears when magnesium ribbon is
dipped in it.
d)Sodium and potassium metals are stored under kerosene or paraffin wax.
e) The red litmus paper turns blue, when we dip it in magnesium oxide (Mgo)
solution
Answers
Answer:
b. Beside Li-ion anodes, high-grade graphite is also used in fuel cells, solar cells, semiconductors, LEDs, and nuclear reactors. ... Graphite for batteries currently accounts to only 5 percent of the global demand. Graphite comes in two forms: natural graphite from mines and synthetic graphite from petroleum coke.
e. magnesium oxide is basic in nature
Ans of que no.1 is
=Copper wires are used as appliances for boiling water as well as cooking utensils for the simple reason that copper is a good conductor of heat. It is using this property that the processes of cooking and boiling of water is hastened to a great degree when such materials are being used as utensils and boilers.
Ans of que no.2
=Graphite materials remain the dominant active anode material used in lithium-ion batteries. The performance of graphite as a safe and reliable material that provides sufficient energy density for many portable power applications, such as mobile phones and laptop computers