Chemistry / Physical & Chemical Properties
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Solution: Classify each of the listed properties of isopropyl alcohol ...

Question

Classify each of the listed properties of isopropyl alcohol (also known as rubbing alcohol) as physical or chemical.

a. colorless

b. flammable 

c. liquid at room temperature 

d. density = 0.79 g/ mL

e. mixes with water

Video Transcript

Hey guy so in this question we need to identify if the following properties of Isopropyl alcohol which is just rubbing alcohol is represent a chemical property or a physical property, remember a chemical property would help to change the chemical composition of the compound molecules just rearranging attach differently. A physical property would not change the chemical composition of a compound so let's take a look at the first one so here we're talking about first the fact that it's colorless (lacks color) so here we're talking about the physical description of the mixture of the compound of whatever it is since it's colorless the way it looks that's a physical property. Next the fact that it's flammable, OK? So, when we're talking about flammable that means we're using most likely oxygen and heat as a source and we're changing the chemical composition of the compound so it represents a chemical property. For the next one we're dealing with a liquid at room temperature so if you're talking about the phases solid, liquid or gas those are physical states that the compound takes at a particular temperature so the fact that it's a liquid represents that it's a physical property. Next density, density is a bit tricky so when we're talking about density, density is remember mass over volume the density doesn't change the chemical composition of that compound so it's a physical property and then finally we're talking about mixing it with water so if you're mixing it with water we're not talking about changing the bonds of the compound we're just talking about mixing it so that would represent a physical property so remember if it changes the chemical bonds in a way that's a chemical property, if it doesn't if it's just talking about the way that it looks then we're just talking about a physical property.