Label each of the following as either a physical process or a (a) crushing a metal can, (𝐛) prod

step 1 We're talking about chemical versus physical changes. And we have about five different examples

Label each of the following as either a physical process or...

Key Concepts

Physical Process

A physical process involves changes that affect the form or state of a substance without altering its chemical composition. In these processes, the molecules remain intact and only their physical properties such as shape, size, or state (solid, liquid, gas) change. Examples include changes in state like melting or freezing, as well as mechanical actions like crushing or grinding that do not create new substances.

Chemical Process

A chemical process involves a reaction where one or more substances are transformed into new substances with different chemical properties and compositions. During these processes, chemical bonds are broken and formed, leading to molecular reorganization. Indicators of a chemical change can include color change, gas production, heat release, or formation of a precipitate, and such changes are typically irreversible under normal conditions.

Transcript

00:01 We're talking about chemical versus physical changes.

00:04 And we have about five different examples in which we want to label if those particular occurrences are a physical or a chemical change.

00:13 And here we have definitions of both.

00:15 So remember, chemical change is an occurrence of which each is, it changes a substance into something new that is different.

00:22 And they have different properties versus the thing that you just started with.

00:26 So these types of changes are completely irreversible.

00:29 You can't go back and get the same thing that you started with.

00:33 Whereas physical changes, you're only changing the appearance of the substance, but it's the same thing.

00:38 You have not changed the chemical composition of the substance whatsoever.

00:43 So those changes are, in fact, reversible.

00:45 So here we want to take it and think about crushing a metal can, if it's either a physical or a chemical change, well, it's actually going to be a physical change.

00:54 You're not, it's not going any sort of chemical reaction.

00:57 All you're doing is, i mean, you're starting.

00:59 Off with a can that is a brand new and all you're doing is crushing it.

01:04 So you're just essentially, again, you're just changing the physical appearance of the can, but you're not actually making it react with something.

01:11 You're not changing the chemical composition of that can itself.

01:15 You can, in fact, try to straighten out the can as best as you can.

01:19 But in terms of, i mean, in most metal cans, the aluminum is what they're mostly made out of.

01:24 So you're not changing the that particular um you're not changing that particular metal whatsoever so this is in fact a physical change so we're going to go ahead and put a p for physical like so and then the next one here we have the production of urine and the kidneys well uh if we think about that for a second it's actually going to be a chemical change and chemical change because there's so many chemical reactions that take place in order to even produce urine and your kidneys.

01:55 And that requires a lot of studying.

01:57 You can even take a whole class and just your urinary system because of the complexity it is.

02:04 There is quite a bit of chemical reactions that take place.

02:07 It's very complicated chemical reactions in order to lead to the final product itself.

02:12 So you are in fact changing the chemical composition.

02:16 And so for this particular reason, you are in fact undergoing a chemical change.

02:21 For the production of urine and the kidneys.

02:25 And the third example here, we have chocolate melting.

02:27 Well, chocolate melting.

02:28 I mean, if you melt chocolate, it's going to turn to a solid...