Posted by liverpool on Saturday, October 21, 2006 at 10:00am.
When a candle burns the wax melts ( a physical change). Some of the melted wax changes into gas which burns with the flame. This is a chemical change.
when a physical change happens, it is visible
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im doing the same project!
does the rope burn too when it is lighted..
does the rope burn too when it is lighted..
im doing this project too its a levelled assessed task and i needed help is that cheating?!!
a physicalchange is the wax melting and a chemical change is the hydrogen and carbon removed. im doing the same project too
-Im probably not the samee 1 as yooh but im doing a h/w task on this *groans*
-Physical'change: Thee Heat from the flame burns the wax, which melts into a liquid, running down the side of the candle.
-Chemical'change: The wax is heated so much it turns to a liquid; which runs down the side of the candle.
Somee of it hardens at the bottom (i.e. if the candle is on a plate, or surface of somethink), Buh some of the liquid wax turns into the gases: hydrogen and carbon - 'cause there are hydrogen &+ carbon paticles in the wax.
These gases then burn with the flame.
Hopee youuh findd this info helpfuul
x
youmum
a chemical change is when you cant see it hope this was helpful
join the club i was stuck on this homework aswell...
thanks
what are the physical changes???
A physical change is the wax melting and a chemical change is when it lets out heat and light energy - I think....
The difference between a physical and a chemical change is that you can see the physical changes but but you can't really see the chemical changes. The reactants are probably hydrogen, oxygen and carbon, (I'm not too sure) and .... yeah. I hope you find this useful, Bye!
By the way... daos, are you from Mr Archer's chemistry class by any chance?
What do you mean by a chemical change is the hydrogen and carbon removed?
hydrogen + oxygen = H2O (water)
Oxygen + carbon = CO2 (carbon dioxide)
im doing exactly the same thing.
Chechimal change : Chemical Change: Light and Heat is produced. It will make the atoms move around with the energy. The Hydrocarbon vapours burn to give a Combustion reaction with Oxygen of the air which converts the vapour into CO2, CO, C (soot) and H2O vapour (together with Heat and Light).
(If it's a scented candle, the fragrant substance is also vaporised and imparts a pleasant aroma to the atmosphere). The chemical change is the burning of the wax producing CO2 and H2O Chemical- The wick is burned, change the molecular makeup of the molecule.
Physical change :
a)...Solid wax Increases in Temperature to its Melting Point by the addition of Sensible Heat.
b)...The Wax melts to liquid by the addition of Latent Heat.
c)...Addition of more Sensible Heat brings the wax to its Boiling Point.
d)...Further addition of Latent Heat vaporises the Wax to a gaseous form. The physical changes are the melting and evaporating of the wax, paraffin. Physical- shape change, some of the wax becomes liquid.
:)
phyisical changes are always visable but chemicals are not
phisical change ( u can see it ):
A candle melts because of the heat of the flame. The wax turns to a liquid and drips down the candle base. On the way some of the wax turns back to a solid. But most of it gets lost in the air.
chemical change (i think i got stuck on this part as i lost the hwk sheet) :
When a candle melts 3 gases are let off. The gasses are hydrogen, oxygen and carbon dioxide. These gasses burn with the flame.
xx kitty xx hope it is helpful
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hpe its helpfulx
i gt stuck aswellxx
The physical change is the wax melting.
The chemical change is the hydrogen and carbon particles (from the wax) rising into the air and mixing with carbon dioxide.Remember the carbon dioxide is already in the air! then the particles cool and drop as a odour!
cool ar what... this answer is correct i asked my dad who is a science teacher!
the big idea of energy: energy can never be created or destroyed it merely changes forms.
no
THANKS SOOOO MUUCH!!
The Exation below is what is needed for burning:
methane+oxygen-carbon dioxide+water.
hope this is helpfull, im doing the same project tooo :)
what happens when a candle alight
i have this homework too
i mm sooo dumb
im doing this for ma lil sis and even i dnt knw lol fanx for everyone tht has help also wen the candle is aloght it realeases both heat and light energy into the atmosphere around it
I dont know so stop ansking mmeeeeeeeeeeeeeeeeeeeeeee !
im not doin this and ur all gay
when the candle is heated it melts (physical change) and when it burns it is a chemical change. candle wax is made from hydrogen and carbon.
im doing this homework too!!!!!
WHAT IS A PHYSICAL CHANGE AND A CHEMICAL CHANGE?? BY THE WAY IM DOING THE SAME PROJECT!! HELP MEE!!!
WHAT IS A PHYSICAL CHANGE AND A CHEMICAL CHANGE?? BY THE WAY IM DOING THE SAME PROJECT!! HELP MEE!!!
i have exactly the same work!!
this homework is a 7th grade question im a 7th grader its easy
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