It's forever been changed from the explosion. If I set off some dynamite, I can't go back out and wreak and recollect what's left over and try to set it off again. Remember, because we're changing its identity. We've changed the identity of the metal completely into something new. The oxygen on the in the air has actually bonded to the metal surface and created a metal oxide. Well, that's when the metal surface of the car has interacted with oxygen from the air. If you ever look at old beat up cars, you might see some rust spots on it. It's a natural phenomenon that happens every day. So it's identity has been changed, and this is not a physical change iron rusting. It'll be ash will be something completely new and different. Well, when I burn a piece of wood, what's gonna be left at the end will no longer be would. Remember, a physical change does not change the original identity of my substance. So here it says, which change is a physical change. Now that we've understood the basics of physical changes, let's move on to our example question. I crushed it, but I still have a soda can at the end of the day. So a physical change makes a physical change within the state of a substance. Although it looks different at the end of the day, it's still a can. You take that can of soda and you crush it. We can have the crushing off a substance. We can have the chopping, cutting, tearing or breaking of material and similar to breaking. The next four terms are pretty similar to each other. These air keyword that you should be on the lookout for when dealing with physical changes. Then what we can have next is we can have the mixing off substances. But just realize that a salute is the substance that gets dissolved within a liquid. Now we'll talk about in greater detail about the term Salyut in later chapters. Now some common examples of physical changes include dissolving off Salyut. So that basically means that the identity of our original substance stays intact. Now, when we're talking about physical changes here, it's changes in the physical state of a substance without a change in composition. Recall that chemistry is the study of matter and the changes that undergoes now remember, these changes can either be physical changes or chemical changes.
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