CHEM question.
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What occurs as potassium nitrate is dissolved in a beaker of water, indicating that the process is endothermic?State your explanation too.Thanks
Will the temperature of water Rise or Fall ? -
Temperature will fall.
Endothermic reaction mean absorb heat from the surrounding. -
shouldn't it be rising since its endothermic?
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If the temperature rising, it's means Exothermic. Heat is release into the surround. That's why you'll feel the increase in temperature.Originally posted by Y_Shun:shouldn't it be rising since its endothermic? -
I personally think that it will fall too.However the problem is that some of my friends and also they quoted from the teachers (not sure if its really from the teacher) that the temperature of the water will rise as it absorbs energy[heat] from the surrrounding.
Same explanation but different answers. -
Same problem faced when my teacher taught us this chapter..Originally posted by LeonKing:I personally think that it will fall too.However the problem is that some of my friends and also they quoted from the teachers (not sure if its really from the teacher) that the temperature of the water will rise as it absorbs energy[heat] from the surrrounding.
Same explanation but different answers.
Just remember this:
If the beaker get warmer, it's Exothermic reaction. Heat is release to the surrounding making surrounding warmer.
If the beaker get cooler, it's Endothermic reaction. Heat is absorb from the surrounding, making the surrounding cooler.. -
By right, dissolving potassium nitrate should be an exothermic process since you are breaking bonds and creating disorder.
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Thats not the point here.Im trying to find out rise or fall so do not post unrelated stuffs please, thanks.And the question states that its endo.So we must assume its endo( i dont really know whether its endo or exo) but still yup, im trying to find out rise or fall and you came telling me its exo. 0.oOriginally posted by ^tamago^:By right, dissolving potassium nitrate should be an exothermic process since you are breaking bonds and creating disorder. -
..............Originally posted by LeonKing:Thats not the point here.Im trying to find out rise or fall so post unrelated stuffs please, thanks.And the question states that its endo.So we must assume its endo( i dont really know whether its endo or exo) but still yup, im trying to find out rise or fall and you came telling me its exo. 0.o -
I admit I am quite bored just now, so I do a search on that question.
Here's the explanation.
Answer: The temperature of the solution decreases.
Explanation: Endothermic reactions cause heat to be absorbed. The potassium nitrate needs heat to dissolve. It takes this heat energy from the water. As the water loses heat energy, the temperature of the water decreases. Note: an exothermic reaction would do the opposite: the temperature would rise as heat was given off.
Source: Regents Prep Chemistry.
http://regentsprep.org/Regents/core/questions/topics.cfm?Course=CHEM -
endothermic means energy is taken in, but the energy is taken to break bonds , hence temperature drops , due to energy from outside breaking bonds.
But in this case it seems their asking for water , so i'm not very sure. -
thx for the help
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erm, this is extremely basic, endo process, energy taken in, total energy of surrounding decreases, thus temperature decreases.Originally posted by LeonKing:What occurs as potassium nitrate is dissolved in a beaker of water, indicating that the process is endothermic?State your explanation too.Thanks
Will the temperature of water Rise or Fall ?
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I just checked, it's endo.
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hacker is smart soa...LOL
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Edit:typo
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walao eh....
break bonds=absorb energy
form bonds = release energy
The reason why it is endothermic is because the energy required to break bonds is more than the energy released when bonds are formed.
In this experiment, the heat is the one you get from the room temperature.
Why is it that heat is absorbed but the substance is cold? Because its a god damn CHEMICAL reaction (nothing PHYSICAL) and energy is already used to break bonds. -
temperature will rise coz endothermic means gain heat..
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wrong.Originally posted by gunner77:temperature will rise coz endothermic means gain heat..
temperature(surroundings) will fall coz heat is required to break chemical bond. -
ya la tats why more heat will be inOriginally posted by HyuugaNeji:wrong.
temperature will fall coz heat is required to break chemical bond.
more heat = increase in temperature la -
Wrong.Originally posted by gunner77:ya la tats why more heat will be in
more heat = increase in temperature la -
the heat is used to break the bond instead of rising the temperatureOriginally posted by gunner77:ya la tats why more heat will be in
more heat = increase in temperature la -
conventionally it happens the other way, u need to put in energy to create order (form bonds), and energy is given out when u break bones (like hydrocarbon fuels breaking up into CO2 and H2O).Originally posted by HyuugaNeji:walao eh....
break bonds=absorb energy
form bonds = release energy
The reason why it is endothermic is because the energy required to break bonds is more than the energy released when bonds are formed.
In this experiment, the heat is the one you get from the room temperature.
Why is it that heat is absorbed but the substance is cold? Because its a god damn CHEMICAL reaction (nothing PHYSICAL) and energy is already used to break bonds.
however, in this case, it is an ongoing process of ionisation and deionisation (KNO3 is only partially soluble), until the solution reaches equilibrium. this type of reaction can be exothermic or endothermic. -
energy were taken in to break the bond, energy were given out when bonds were form.Originally posted by ^tamago^:conventionally it happens the other way, u need to put in energy to create order (form bonds), and energy is given out when u break bones (like hydrocarbon fuels breaking up into CO2 and H2O).
however, in this case, it is an ongoing process of ionisation and deionisation (KNO3 is only partially soluble), until the solution reaches equilibrium. this type of reaction can be exothermic or endothermic.
for hydrocarbons, energy were given out because bonds forming involve more energy then bonds breaking, in this case, energy given out is more than energy taken in. Energy taken in the break the hydrocarbon bond is less than the energy given out when CO2 and H2 were formed. Thank You -
x2... will rise if it's exoOriginally posted by Darkness_hacker99:Temperature will fall.
Endothermic reaction mean absorb heat from the surrounding.