<span>A melting point is the characteristic physical property of a substance. So melting point analysis is one of the simplest and most useful techniques for identifing of a chemical substance. Melting point analysis can also provide information about the purity of a sample. A substance containing soluble impurities usually melts at a lower temperature than the pure compound. It can also melt over a wide range of temperatures. The smaller the range of melting temperatures, the higher the purity of the sample.</span>
Answer:
89.7
Explanation:
First we have to look at the right of the digit which is going to be round. If it is 5 or greater than 5 than the number left to it should be increased by one.
For example
In given number 89.667 after three digits 8, 9, 6 the next digit is 6.
So in order to round the number to three digits 6 will rounded to 7 and value becomes 89.7
If the digit next to rounded digit is less than 5 than number will rounded as,
For example:
56.42
Rounded to three digit it will be 56.4.
Answer:
The SI system , also called theatrics system, is used around the world
True, H2O is a compound with 2 hydrogens and one oxygen
