in this video we're going to talk about the difference between physical properties and chemical properties when you think of properties properties are characteristics a physical property describes characteristics that does not change the chemical identity of the substance whereas a chemical property it describes a characteristic that will change the chemical identity of a substance so for example boiling point the boiling point of a substance is a physical property when water boils when it converts from a liquid to a gas when it goes from water into steam it's still water the chemical identity is still H2O so if the chemical identity hasn't changed you have a physical change and boiling point is a characteristic of water it's the temperature at which water boils and so because the boiling process is associated with a physical change boiling point which is a characteristic of water must be a physical property of water so physical properties physical changes they're associated with each other a property is simply a characteristic of a substance so boiling point melting point freezing Point these are all physical properties let's think of ice when ice melts into liquid water the chemical identity does not change ice is still H2O so any type of property where the state of matter is changing that's a physical property so melting point boiling point vaporization that's another physical property now what about flammability when you hear the word flammability is that a physical property or is that a chemical property flammability has to do with a substance burning if you burn paper you are changing the chemical properties of paper when you burn paper the paper breaks down into carbon dioxide and water and maybe some other stuff as well so the chemical identity has changed you now have a new substance so therefore flammability is a chemical property because it has to do with a change in substance producing a new chemical substance now what about ductility is that a physical property or a chemical property when something is ductile you need to know what that means copper is ductile copper can be pulled into a wire so if you have a copper bar metal you can turn it into a wire however both substances are still copper the substance did not change the chemical identity is still the same so therefore ductility which has to do with turning a metal into metal wires is a physical property it's not a chemical property because it doesn't change the chemical identity of a substance or it doesn't describe something that changes the chemical identity of the substance okay what just happened here now what about the word corrosive if something is corrosive what is that mean are we describing a physical property or a chemical property so if I say acid is corrosive would you define it as a physical or a chemical property corrosion has to do with a chemical reaction acid is corrosive because it can strip off electrons from metals and whenever there's a chemical reaction the characteristic that describes it is a chemical property so something that is corrosive that's a chemical property of that substance something that is combustible is also a chemical property of a substance for example gasoline is combustible that's a chemical property of gasoline if you put gasoline in air and you add a spark to it to get things started it's going to combust is going to react with oxygen creating a large fire so combustibility or if something is combustible that is described in the chemical property of that substance now what about malleability if something is malleable is that a physical property or a chemical property now let me tell you what it means when something is malleable let's say if you have a chunk of aluminum you can hammer it into sheets and get aluminum foil or just a flat sheet so aluminum is malleable now regardless if you have a large chunk of aluminum metal or if you have a flat sheet it's still aluminum the chemical identity is the same so if you take a chunk of aluminum and turn it into a flat sheet you haven't changed the chemical identity of the substance so this is associated for physical change so malleability is a physical property now what about the word explosive if a substance is explosive are we describing the substance physical property or it's chemical property something that is explosive tends to be combustible so this is another chemical property it has to do with a reaction like TNT is explosive sometimes it could just react with itself it doesn't have to react with other things but once you get it started a chemical reaction will take place so whether something's explosive or combustible it has to do with a chemical reaction so those are chemical properties now what about color let's say the color of that book is red or those sheets are blue these are physical properties the color itself has nothing to do with a chemical reaction however if you see a solution change in color that is a chemical reaction it it indicates a reaction's taking place but color itself is a physical property but if you see a color changing then a chemical reaction is taking place which leads to a chemical change now what about viscosity is viscosity a physical property or chemical property so for example water is not viscous water can flow easily but something like syrup or honey it's very viscous viscosity has to do with the resistance of fluid to flow so Syrup and Honey doesn't flow fast as water so the viscous viscosity is a physical property it describes how a fluid travels it doesn't really describe how a fluid reacts with something so whenever a word or property describes how something reacts that's a chemical property if it doesn't describe a reaction it's going to be a physical property now what what about pH is the pH of a solution is that a physical property or a chemical property pH is a chemical property acids tend to react with most metals and the pH of an acid has to do with the strength of an acid a strong acid usually have a low PH number and so by just in a pH you can affect how an acid reacts with something and so pH is a chemical property because it's associated with a reaction density is a physical property it describes how the atoms in matter how close apart or how far apart are they something that has a high density has a lot of matter in a very small space something that is not very dense like a balloon has a lot of space but not much matter so density is a physical property it doesn't describe how a substance reacts but rather it describes it relates mass with volume it describes the distribution of matter within a certain space so other things that are physical properties mass is a physical property weight these have to do with the quantity of matter or the force that they exert on the earth it doesn't have to do with how they react with another element a volume that's another physical property now what about taste taste is a chemical property let's say if you know lemonade tastes sour it's because it's acidic or uh that substance tastes bitter it's basic and so your body is reacting to the different pH levels in these Solutions so taste is a chemical property the taste of Lemonade's acidic so that's describing the acidity of of that drink so hopefully this video helps you to clarify the difference between physical properties and chemical properties and that's all I got thanks for watching