2HgO → 2Hg + O2 Mercury (II) oxide → Mercury (II) + Oxygen
Physical. The mercury doesn't change.
It is a chemical because it is producing a new substance.
Yes, heating mercury to produce mercury vapor is a physical change because no new substances are formed. The change is reversible, and the mercury can return to its original state once cooled back down.
physical change
Grinding mercury or iodine would be a physical change - you are changing the shape but not the element. However, grinding mercury with iodine may be a chemical change if you end up with mercury iodide through a chemical reaction. Incidentally, I don't recommend actually trying this - mercury is a liquid at room temperature (it is also called quicksilver for this reason) and is very toxic to humans.
Both. A chemical reaction occurs & a physical change is noticeable.
Oxidizing is a chemical change, as it involves a substance reacting with oxygen to form new compounds with different properties. In contrast, physical changes do not alter the chemical composition of a substance.
Oxidation and reduction are chemical changes.
Physical. The mercury doesn't change.
It's a chemical change because the apple is oxidizing. It turns brown, because of the oxygen, hence the word " oxidizing".
No its a chemical change because the acid in the rain reacts with the copper in the statue having a reaction oxidizing it and turning it green.
This is a chemical reaction; oxygen is released.
During freezing the chemical nature of mercury remain unchanged.
It is a chemical because it is producing a new substance.
Yes, heating mercury to produce mercury vapor is a physical change because no new substances are formed. The change is reversible, and the mercury can return to its original state once cooled back down.
physical change
Grinding mercury or iodine would be a physical change - you are changing the shape but not the element. However, grinding mercury with iodine may be a chemical change if you end up with mercury iodide through a chemical reaction. Incidentally, I don't recommend actually trying this - mercury is a liquid at room temperature (it is also called quicksilver for this reason) and is very toxic to humans.