Physical changes can be reversed and chemical changes can’t be reversed. A physical property is a characteristic which can be identified without changing the substance but to identify a chemical property, you do have to change the substance.
Answer:
two dots around each side.
Explanation:
Answer:
merits of mendeleev periodic table are:
- it was first scientific and systamatic study of different element.
- there were may gaps for in discovered elements.After their discovery the got their proper place in table.
- with the help of mendeleev periodic table , properties of several elements were studied correctly.
demerits of mendeleev periodic table
- it could not arrange hydrogen as it shows the property of both alkali and halogens.
- it could not arrange isotopes because they have different atomic weight but same atomic number.
- it could not arrange Lanthanides and Actinides.
hope these points helped you
need more points then comment it .
Potential energy is stored energy
Answer : The concentration of the 
is, 0.115 M
Explanation :
Using dilution law,
where,
= basicity of an acid = 1
= acidity of a base = 1
= concentration of 
= 0.125 M
= concentration of KOH = ?
= volume of = 25 ml
= volume of NaOH = 27.07 ml
Now put all the given values in the above law, we get the concentration of the .
Therefore, the concentration of the is, 0.115 M
