No actually it isn't. Breaking a bone is a physical change. Think about it. Are you changing it into a different substance. No you're not, so it's a physical change.
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No, breaking rock into small pieces is a physical change because the chemical composition of the rock remains the same. It is merely a change in the physical appearance of the rock.
No because there is no change in the identity of the rock, instead of being rock solid, it is powder rock solid.
Also there is no evidence of a chemical reaction.
No, breaking ice into smaller pieces is a physical change, not a chemical change. A chemical change involves a change in the chemical composition of a substance, while breaking ice only changes its physical state.
Crushing an aspirin is a physical change because the chemical composition of the aspirin remains the same even after it has been crushed.
To break into small pieces is to pulverize. If the substance is broken down far enough it will become powdered.
Food undergoes chemical changes in the stomach, where it gets broken down by stomach acids and enzymes, and in the small intestine, where further digestion and absorption of nutrients occur.
Mechanical digestion is not considered a chemical change. Mechanical digestion involves physically breaking down food into smaller pieces through chewing and mixing with digestive juices, whereas chemical digestion involves enzymes breaking down macromolecules into smaller molecules.