Videos

Physical and Chemical Change

Added Sep 19, 2016 •

Copy this URL:
Embed code:	<iframe class="edlio-embed-player" type="text/html" width="640" height="360" src="//www.khswaveriders.org/apps/embed/?v=120841" frameborder="0" allowfullscreen></iframe> Change dimensions

Show Transcript

hi mr. Anderson and today I'm going to be talking about the changes are physical and chemical changes and sometimes struggle telling the difference between chemical and physical changes and teachers love to China hard questions like let's see if water is boiling is that a physical or a chemical change or if a mothball vaporizes over years is that app color it chemical change or if you mix vinegar I decided to start with this picture right here I live in Montana and so in Montana In-N-Out Burger I go to California I love to get in and out burger at the fry the perfect get a shake oh my goodness in already getting hungry when I eat burger Burger King to changes the first team is going to go to our physical in other words I'm going to start showing up at Burger making it into smaller and then going to go through my digestive system and I'm going to start to chemically break down that burger now the cool thing about about a burger is that that burger will eventually be gone you in other words the amino acids that are in a burger they're going to be broken down and then they're going to use them up inside our body text build up the proteins inside her body important chemical and physical changes in the need understand how you made threats physical changes my definition for physical changes when the appearance changes but the substance does not appear to look at his pen for example is it undergoing no but let's say that this pain were to change its appearance but it we're still to be the parts of a pen that would be a physical change and so how could that happen tell us we were to melt slightly where to break it in half and it still be another words as long as it doesn't combined with another chemical as long as that substance stays the same it's a physical change and other words that start with something water and we go from water that is a solid like in this down here and then we end up with water that is liquid inside the sizes actually going to sublimate took in a vaporizer will still eat you out and so it's going to be a physical change at each of those points and so here's some things in the side that I said you could check out the pacifical chain is it just melting if it's boiling if I think I have a picture of that super boiling water that way as a teacher a lot of don't know why water boils in other words they don't know what the inside the bubble inside what until what is inside the bubbles inside boiling water well it's not hydrogen and oxygen gas that be bad because it was hydrogen and oxygen gas hydrogen and oxygen gas once they come out with quickly but I didn't is going to come by sin explo and we know that doesn't happen so what's actually in bubbles in boiling water is simply water vapor in other words its water and it's in the state of a gas until we would say not the chemical set the physical change or we were dead for example breaking bricks in half or keep breaking in half and half and half and half and half and they're still brexit recall that physical or let's say we were to cut things in half so we're to use this torch in the cut this metal in half the metal heater the metal here would still be the same until we call that a physical change to this pipe now right along the point at which is cutting if we combine that with ride along that edge and it's going to be oxidizing so we call that a chemical change and then another tricky one to sign teaches like to pick you up with dissolving what's the where's the power to take a little bit of sugar and add it to this as that Sugar dissolves in other words that goes from this song do that more I'm surrounded by water kind of a state we wouldn't call that a chemical change we call that a physical change and so not chemical change and a physical change can we don't have any kind of a chemical reaction taking place and we don't have a formula we can plan or change his appearance so there's a lot of stuff is not really what chemical change is chemical changes when you have a substance example to go back to water to break down water into a gas H2 + O2  then you'd know that I am not I don't have a water anymore I have the chemical changes okay now the substance on one side of the sign yield to substitute on the product over here so we can occur and what are some clues that a chemical change produces is right here is mixing acetic acid sodium bicarbonate otherwise known as mixing baking soda with vinegar and what we're getting is bubble for me and Bobble there going to be a new cat you might be confused thinking yeah but you just talked about boiling water and once that turns into bubble think about it did we have bubbles inside vinegar degree a bubbles inside the sodium bicarbonate know until we created something new created a gas and that's what's actually form in the bubbles what makes a volcano explode but they we mix two chemicals together chemical in chemical B and we mix 1 chemical another one which normally would clear that to get kind of Cloudy so chemical changes probably appearing liquid or clouds in the air that usually just needs a new particle is being formed into a new a chemical and being form okay let's say we get a temperature change a temperature change a chemical reaction is taking place go to guy we get some carbon dioxide we get some H2O and I did a lot of energy and so we're creating and are giving off energy was stored in the chemical bonds of the methane and so we would call that a chemical change and other words increase the temperature so this right here is pretty cool we've got two different salts that are probably burning in alcohol and they're giving off colors depending on what kind of atoms they are and we would call that temperature change the salt by themselves are white on and as we had enough energy to get combustion with oxygen so this is how fireworks are formed that are mixed up and then they we give them combustion or or not enough of an oxidizer when you get all these different color so color change we got a chemical change then the last one  if we've got out his achill once is bioluminescence into this is adding a couple of that actually glow we see this in life a lot for jellyfish and produces proteins that chemical reaction chemical flight the last one that I was trying to get to his bread if you've ever seen the baking bread there is a chemical change that's going on to all the product by themselves didn't smell that way but we mix them together we get chemical reaction  that we've got smell or changing  taking totally say tasting chemicals physical change yeah I've been chemical or going back to a couple of days what about boiling water chemical or physical is it going what about taking moth balls that you put in your drawer to keep your sweater them off from eating your sweater is that a Verizon what's going to be going to be a physical change so the last thing I want to leave you with his if we ever have a chemical change then we have a chemical reaction in a chemical reaction the first reactant reactants and then we're making if we mix hydrogen gas with oxygen gas and create water and they died chemical change and usually a bad little bit of energy to that Catanzaro  yield Sabattus get this out for a second do the height hydrogen is going to look like that hydrogen Is two hydrogen molecules attached together the bit to right here is called the subscript that tells me that there are two hydrogen molecule of hydrogen two in the front means that we have two molecules of that until the left side molecules of hydrogen gas on the side of two atoms of hydrogen to look over here at the oxygen oxygen bigger Oxygen Tattoo itself  there's two oxygen atoms that there's only one molecule of that so now let's look at the look at the product and the right one water so water looks like this that I did and another water here hydrogen hydrogen, we should have the same at the balanced equation to how many hydrogen do I have on the left side one two three four how many hydrogen gas on right side 1 2 3 4 that balance Oxygen's on the left side of that one too an oxygen on the right side we've got one too so that's a balanced equation so I got a podcast on balancing equations you can take a look at if you don't know how to do that keeping that you can always change the coefficients to be one right here be like breaking that oxygen the house and we know that that doesn't occur I hope that's helpful those are chemical and physical change

Uploaded by E. Bellah.

Videos

Physical and Chemical Change

More videos from E. Bellah