Explanation is in a file
bit.
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Atomic number is your answer.
Answer:
I don't know the answer of this question.
Answer: 
Explanation:
Given
Mass of water in the sample is 
Temperature changes from
to 
Change in temperature is 
We know, specific heat of water is 
Heat absorbed is given by

Thus, water absorbs
of heat from hot plate.
Answer:
For the first reaction the reagents are: MgCl2 and Na2CO3
For the second reaction the reagents are: Na2HPO4 and CaCl2
Explanation:
Precipitation reactions lie in the production of a compound that is not soluble, which is called a precipitate, this precipitate is produced when two different solutions are combined, each of which will contribute an ion for the formation of the precipitate. In the first reaction you have:
MgCl2 + Na2CO3 = MgCO3 + 2 NaCl
Type of reaction: double displacement
The second reaction is as follows:
4Na2HPO4 + 3CaCl2 → Ca3 (PO4) 2 + 2NaH2PO4 + 6NaCl
It is the reaction of sodium hydrochlorophosphate and calcium chloride