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What is a physical change?

Answer 1

A change in (matter or substance) which does not alter the chemical properties of the matter.

A physical change is a type of change in which the form of matter (substance) is altered but one substance is not transformed into another different substance. For example, if we carve a piece of wood into a baseball bat, it will still burn in a fire and float on water. It remains wood, so it is a physical change.

(b) Crushing a can : after crushing can changes its shape, size but it still remain Aluminum so it is a physical change.

Burning of wood is a chemical change because on burning wood changes to a totally different new products (ash, smoke and carbon dioxide).

Here is video of a lab with a number of examples of both chemical and physical changes.

video from: Noel Pauller

Simple explanation with good results can be on this site https://tutor.hix.ai

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Answer 2

Olivia Anton

When a substance changes physically, it means that its shape, size, state of matter, or density are all altered while maintaining its chemical composition.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.