Question

Answers plssss
1._________ is formed when the atoms lose or gain electrons.
2.which of the following is a bad conductor of electricity?
a)copper
b)gold
c)pure water
d)silver
3.convert full cream milk into toned milk .what kind of change is this?
4.how do you convert water into hydrogen and oxygen?
5.what are exothermic and endothermic reactions that encounter in your daily life ?list a few.

Answer 1

1.Ion
2.pure water
3.irreversible change
4.electrolysis
5.endothermic:evaporation
exothermic:burning of fuels.



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Answer 2

hey, akarsh here

1) ions are formed when atoms lose or gain electron.
.
2) pure water is bad conductor of electricity.
.
3) full cream milk into toned milk is reversible change(or physical change) because more cream can be add to make it cream milk
.
4) By the process called electrolysis water is converted into hydrogen and oxygen
.
5) reactions in which heat is liberated is called exothermic reaction
eg.
rusting of iron..
As it goes without any doubt, rusting of an iron is a chemical reaction. Iron gathers oxidisation at a very slow pace. So rusting is an exothermic reaction between iron and oxygen. Rusting takes place when iron is in pure form or it is alloyed. Heat gets released during this process when iron comes in contact with oxygen.  Rusting is basically the formation of chemical substance that takes place due to formation of moisture on the iron. The chemical formula for this goes as Fe2O3.xH2O
making ice cubes is also a exothermic reaction

reactions in which heat is not liberated is known as endothermic reaction
eg. evaporation is endothermic reaction because water absorbs heat to evaporate