D. Give reason of the the following. 6 marks.
a. Recycling plastic is a better option than burning it.
b. Sodium reacts with cold water whereas iron does not.
c. Copper cannot displace iron from its salt solution.
d. Sodium is stored in kerosene.
E.Write molecular formula of the following compounds. 6 marks.
a. Calcium oxide b. Zinc chloride c. Ferric oxide d. zinc hydroxide.
e. Calcium nitrate . f. Hydrogen sulphate.
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Answer:
(a) By burning plastic would cause air pollution but recycling it will neglet the demand of new plastic and helps in maintaining the environment clean.
(b) Sodium is a highly reactive metal thats why it happens .
(c) Copper is unsuccessful in displacing Iron from its salt solution because Iron is more reactive than Copper
E
(a) CaO
(b) ZnCl2
(c) Fe2O3
(d) ZnH2
(e) Ca (NO3)2
Answered by
1
A) Recycling plastic is a better option than burning it because it is more eco-friendly.If we burn it it releases harmful pollutants which can cause land and air pollution and can harm humans if they inhale those pollutants. As we know that plastic can not be degraded so it is better for us to reuse it which will help us preserve the natural resources for our future generations.
B)Sodium reacts with cold water but iron does not because sodium(Na) is more reactive than iron(Fe). Na is placed above Fe on the reactivity table which means that Na is more reactive and its reacts with water(H2O) in order to become stable. Whereas Iron is not that unstable so it does not reacts vigorously with cold water.
C) Copper cannot displace Iron from its salt solution because copper is placed below Iron in the reactivity table and as we know the elements placed below cannot replace the more reactive elements. But Iron can displace copper from copper sulphate.
D) Sodium is one of the most reactive metals, so it reacts violently with oxygen present in the air. It burns as a reaction with oxygen. So in order to keep it safe we immerse it in kerosene oil which acts as a barrier between sodium and air and will prevent it from burning.
E)a} 56u
b}136.38u
c}159.69u
d}99.424u
e}164.088u
f} 98.079u
Hope u like the answer
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B)Sodium reacts with cold water but iron does not because sodium(Na) is more reactive than iron(Fe). Na is placed above Fe on the reactivity table which means that Na is more reactive and its reacts with water(H2O) in order to become stable. Whereas Iron is not that unstable so it does not reacts vigorously with cold water.
C) Copper cannot displace Iron from its salt solution because copper is placed below Iron in the reactivity table and as we know the elements placed below cannot replace the more reactive elements. But Iron can displace copper from copper sulphate.
D) Sodium is one of the most reactive metals, so it reacts violently with oxygen present in the air. It burns as a reaction with oxygen. So in order to keep it safe we immerse it in kerosene oil which acts as a barrier between sodium and air and will prevent it from burning.
E)a} 56u
b}136.38u
c}159.69u
d}99.424u
e}164.088u
f} 98.079u
Hope u like the answer
Mark as brainliest
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