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Is breaking coal into pieces chemical or physical change?
Breaking coal into pieces is a physical change because it does not alter the chemical composition of the coal. The coal remains composed of the same elements before and after being broken into pieces.
Is tearing a clothes into pieces a physical or chemical change?
Physical.
Is mixing two cheeses in a bowl a physical or chemical change?
No. The cheese is still cheese, it's just in pieces now.
Is mixing coca powder with water a physical or chemical change?
To call it an physical or chemical change, we first need to describe both of them briefly. A physical change is the one which does not change the chemical properties of a substance. A chemical change is the one which changes the chemical properties of a substance. Whether they can be recovered or not is not of importance here. So if you mean to dissolve some powder in hot water such that it does not make any reaction with water, then its a physical change. (Mixing flour or salt or sugar powder are examples) However if you put some powder in hot water which creates a reaction and the molecules of that powder are no longer the same, then it would be a chemical change. (Adding tiny sodium or potassium pieces to water are examples)
If something is broken into tiny pieces is it a chemical or physical change?
Physical.
Is changing the size and shape of pieces of wood a chemical change true or false?
False. Changing the size and shape of pieces of wood is a physical change, not a chemical change. A chemical change involves the alteration of the chemical composition of a substance, while a physical change only affects the physical properties of a substance.
Is tearing paper into smaller pieces a chemical change?
no... its a physical change
Is cutting wood into 10 pieces a physical or chemical change?
That change would be physical, since the chemical identity of the wood has not been altered by cutting it.
Is a solid breaking up into many pieces a chemical change?
Disintegration can be a chemical change, but it depends on what kind it is. For example, sharpening a knife is a physical change, but burning a piece of wood is a chemical change.
When a bottle breaks into pieces does it undergo a chemical or physical change?
It is a physical phenomenon.
When a piece of paper is torn into two pieces has it undergone a chemical change or physical change?
It encountered a physical change.
When a firecracker explodes giving off light and heat and breaking the wrapper into many pieces is that a physical change chemical change or both?
This is both a physical and chemical change. The explosion involves the release of energy (heat and light), which is a chemical change due to the breaking of chemical bonds. The breaking of the wrapper into many pieces is a physical change as it does not involve any change in the chemical composition of the materials.
