Answer:
physical - arrangement of molecules changes
chemical - identity changes
Explanation:
All of above. Overdoses have side effects like troubles breathing and other
Copper is widely sought world market and New York mercantile exchange because of its very high thermal and electrical conductivity. It is mostly used as a conductor of heat and electricity, a component of various metals of alloy and as a building material.
Answer: 15 grams of magnesium will be present in the magnesium sulfate
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.
The balanced chemical reaction is:

As the mass remains conserved at the end of the reaction, there will be 15 grams of Magnesium in magnesium sulphate.
Answer:
Isotopes
Explanation:
We call atoms of the same elements with different mass numbers isotopes.