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Subject: Science, asked on 23/9/17

what would happen if there are no expansion and contraction occurring in liquids and gases

Subject: Science, asked on 19/9/17

Why does a blacksmith heat the metal rim to fix it on a wooden wheel

Subject: Science, asked on 18/9/17

'Sand being washed out to sea from the beach' physical or chemical change ?

Subject: Science, asked on 7/9/17

what is crater
 

Subject: Science, asked on 30/8/17

How does salt melt ice and then freezes it again ?

Subject: Science, asked on 30/8/17

explain about irreversible change

Subject: Science, asked on 28/8/17

what is the name of the biggest sun? ? ? ?

Subject: Science, asked on 20/8/17

SOLVE THESE PLEASE :-

b. Differentiate between physical and chemical change.

Physical change                                                                                     Chemical change

Subject: Science, asked on 19/8/17

full form of led

Subject: Science, asked on 7/8/17

A Paper is torn into many pieces and then we want to make a Paper by joining these pieces of paper. If we try to do so, we will not get the Paper in it's original form. Hence, it is said to be an Irreversible action. It is given in the Book.
My question is that if we join these pieces of Paper with the help of gum/glue, is it not possible to make the Paper which was in it's earlier form? In that case, it will be a Reversible action. Is it right?

Subject: Science, asked on 24/7/17

material which can be compressed or scrathed

Subject: Science, asked on 21/7/17

are these changes reversible or not ?

Subject: Science, asked on 19/7/17

How does changes involves energy?

Subject: Science, asked on 17/7/17

why is K symbol of potassium

Subject: Science, asked on 17/7/17

write the elements named after scientists and coutries

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