No, of course not. I can't give you a long drawn out answer but it is definitely not.
Mashing potatoes does not cause a chemical change because the composition of the potatoes remains the same. It is strictly a physical change, as the potatoes are being physically broken down into a new form but no new substances are being created.
Potatoes that are contain more starch than the average are used as boiling potatoes. The color of a potato does not dictate its use due to there being hundreds of varieties of potatoes. Potatoes that are ideal for making mashed potatoes are russet varieties (the majority of Idaho grown potatoes are russet, and Caribe. Yukon Gold, Peruvian Blue, Superior, Kennebec, and Katahdin are all purpose potatoes.
chemical change
A metal Surface being ground is a physical change, not a chemical change.
Here are some links to potato recipes on a fabulous cooking website called epicurious.com.You can search the recipe data bank using the word "potatoes" and find many more, but I can vouch for these three being very tasty and easy to prepare.http://www.epicurious.com/recipes/food/views/Thyme-Roasted-Sweet-Potatoes-233085http://www.epicurious.com/recipes/food/views/Garlic-Mashed-Potatoes-with-Chives-108582http://www.epicurious.com/recipes/food/views/Olive-Oil-Mashed-Potatoes-107604
physical. the water being added simply soaks through the coffee, so there's no chemical change.
Gasoline being poured into a tank is not a chemical change.
Being resistant to corrosion is a physical property of a material, not a physical or chemical change. It means that the material does not undergo chemical reactions with its environment that would cause it to deteriorate over time.
burning of tree or wood is an irreversible chemical change
It would be both. It's a physical change because it is changing state and a chemical change because water is being evaporated.
no, its physical change :)
A chemical change can not be reversed. Obviously the fire work can not be put back together because it has reacted, not being able to be reversed, and therefore, being classified as a chemical change.