Question

Sugar water turning to sugar crystals on the stove is a chemical change.

True
False

Answer 1

I was never too good with Chemical and Physical change. I knew the basics, but never got the whole.. depth of it down.

Answer 2

its a physical change for sure

Answer 3

i will explain you why before you ask for it
a physical change is one which can be reversed eg you convert water to steam you can condense it back to water you heat a sugar solution you evaporate the water leaving behind sugar crystals now if you condense the evaporated water and again mix it with sugar crystals you will gwt back the solution you started with

Answer 4

thank you

Answer 5

mst welcome :)

Answer 6

So in other terms for example evaporation would be chemical, right?

Answer 7

wait, no
nvm

Answer 8

Physical.

Answer 9

no in this case atleast it wont be because you can cool down the vapours and get back water so its physical and no permanent change occured

Answer 10

x_X I'm just really bad with this. In a simple way Chemical change is something changed due to chemicals? And Physical is when the state of matter is changed?

Answer 11

how about this simple line chemical change can not be reversed and physical can be reversed

Answer 12

OH

Answer 13

So like if I burned paper, thats chemical. And if I burned wax it'd be physical.

Answer 14

and most importantly chemical change does not necessarily mean that you hav to add chemicals to change the state but this is true that in a chemical change the whole substance is converted to a new thing but in physical there might be a phase change eg solid to liquid solid to gas as in sublimation

Answer 15

So in other terms, ash can't be converted back into it's previous form, so it'd be a chemical change. And since Wax cools down and goes back to being what it's solid form previously was its a physical change.

Answer 16

As examples. that is.

Answer 17

Or when freezing water, to turn into ice, but it can change back to water. so it's a physical change.

Answer 18

Then you would have steam where you can't get the water back so it's chemical.

Answer 19

ice to water is also physical and water to steam is also physical but like you said formation of ash by burning is chemical as for candle wax you have hydrocarbons such as parrafin in it which are converted in to co2 and water on heating so you cant consider it completely physical however some parts of the wax liquify and again solidify but if you notice there is always a decrease in the quantity of wax

Answer 20

yeah i understand. but then what would you call that? Since it is both, technically speaking. Or does it have no name?

Answer 21

hmm giv me a minute to think on it

Answer 22

there is no just particular type of wax i think it would depend on what type of wax you take there are numerous animal waxes plant waxes synthetic as well and these are just the major well wax burning is physical as you can get it back but when you hve other things mixed with it like parrafin wax then you get a reduced quantity when you cool it though i will still search it up cuz i am not sure about the formula of waxes

Answer 23

dont take this as a permanent answer

Answer 24

got you answer :D

Answer 25

melting of wax is physical change now if you have any question in your head ask

Answer 26

ah okay, no more questions. I was just curious as to the rest. haha. learning !!! fun thing.

Answer 27

thank you

Answer 28

i am dying to explain my concept since you wont ask well waxes are mostly longchain hydrocarbons now we take the example of a candle and assume that it didnt hav any special component jus wax now you light the candle and the wax melts we said melting of wax was a physical change then how come the wax is being reduced ???
now here is the answer to that when a candle wick is lightened it not only melts the wax but some wax near to the wick also gets vaporised and converted carbondioxide and other components so burning of candle wax is chemical change but its melting is physical just like the butter

Answer 29

I just want to add it is a chemical change.

Answer 30

(sugar water turning into water crystals) at least that's the answer teachers are looking for