the small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. water vapor readily adsorbs onto the surface of silica gel, so it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided, you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs of δg, δh, and δs.
James
Guys, does anyone know the answer?
get the small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. water vapor readily adsorbs onto the surface of silica gel, so it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided, you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs of δg, δh, and δs. from EN Bilgi.
The small bags of silica gel you often see in a new shoe box are placed there to control humidity. Despite its name, silica gel is a solid. It is a chemically inert, highly porous, amorphous form of S i O 2 . Water vapor readily adsorbs onto the surface
Answer to: The small bags of silica gel you often see in a new shoe box are placed there to control humidity. Despite its name, silica gel is a...
Thermodynamics
The small bags of silica gel you often see in a new shoe box are placed there to control...
The small bags of silica gel you often see in a new shoe box are placed there to control... Question:
The small bags of silica gel you often see in a new shoe box are placed there to control humidity. Despite its name, silica gel is a solid. It is a chemically inert, highly porous, amorphous form of
S i O 2 SiO2
. Water vapor readily adsorbs onto the surface of silica gel, so it acts as a desiccant. Despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided, you should be able to make an educated guess about the thermodynamic characteristics of the process. Predict the signs of
Δ G , Δ H ΔG,ΔH , and Δ S ΔS .
Spontaneous Reaction:
Most chemical reactions are reversible, so they can reach an equilibrium state after some time. A spontaneous reaction will have this equilibrium state favor the formation of products, which generally means an equilibrium constant of
K > 1 K>1
. If the reaction is spontaneous at a given set of conditions, then it must have a certain sign for the free energy change
Δ G ΔG
. This thermodynamic parameter itself depends on the reaction's enthalpy and entropy changes at the given conditions, as well as the temperature. The signs of the enthalpy and entropy changes can usually be predicted for a given reaction. Here you must consider such details as the chemical bonds being broken/formed, as well as the net increase/decrease of disorder during product formation.
Answer and Explanation:
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Silicon dioxide is a solid. Water vapor is gaseous water. Adsorption of water vapor on silica requires new interactions (chemical bonds) to be formed,...
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Spontaneous Reactions & Gibbs Free Energy
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Chapter 12 / Lesson 8
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Spontaneous reactions are processes that occur on their own without any outside interference. Review the definition of the spontaneous process, explore concepts such as enthalpy, entropy, and Gibbs free energy, and learn how to predict a spontaneous reaction.
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The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is
The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.
Chemistry
The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is
The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.
Answers
So we look equation for the free Gibbs free energy (ΔG) which depends on entalpy (ΔH), temperature (T) and entropy (ΔS):
ΔG = ΔH - TΔS
ΔG is negative (-) because the water absorption on the silica gel surface is a spontaneous process.
ΔH is negative (-) because the water absorption on the silica gel surface is a exothermic process (it releases heat and if you want to desorb the water form the silica gen you need to add heat which is a endothermic process).
ΔS is negative (-) because the water is adsorbed, so from disorderly state you take the water molecules and put them in a orderly state and by doing that you decrease the entropy.
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Sapling #10 WK5/6
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4 posts • Page 1 of 1
Melody Haratian 2J
Sapling #10 WK5/6
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PostSun Feb 14, 2021 10:41 am
Hey guys, does anyone know how to find ΔH in this problem? The problem is #10 from sapling Wk 5/6:
The small bags of silica gel you often see in a new shoe box are placed there to control humidity. Despite its name, silica gel is a solid. It is a chemically inert, highly porous, amorphous form of SiO2. Water vapor readily adsorbs onto the surface of silica gel, so it acts as a desiccant.
Despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided, you should be able to make an educated guess about the thermodynamic characteristics of the process. Predict the signs of ΔG, ΔH, and ΔS.
Top Will Skinner
Re: Sapling #10 WK5/6
Quote
PostSun Feb 14, 2021 10:54 am
Once you determine the signs of ΔG and ΔS, look at the equation ΔG = ΔH - TΔS. Since ΔG is negative in this case, you have to determine which sign of ΔH keeps ΔG negative (also given the sign of ΔS).
Top Scot Widjaja Dis 1J
Re: Sapling #10 WK5/6
Quote
PostSun Feb 14, 2021 10:56 am
Since we know that the reaction is spontaneous because it is occurring naturally, we know delta G has to be negative. We also know that delta S is negative because a solid molecule has more order. Given that delta S is positive, n order for delta G to be negative, delta H has to be negative according to the equation:
Delta G = Delta H - T * Delta S
Top Megan Lu 3D
Re: Sapling #10 WK5/6
Quote
PostSun Feb 14, 2021 12:16 pm
Hi! Like others have mentioned above, we can start by looking at ∆G. Because this reaction is spontaneous, ∆G must be negative. Because the water molecules are moving from a more mobile form (gaseous) to being bound to the solid silica gel, ∆S must be negative. We can then apply this to the Gibbs equation, ∆G = ∆H - T∆S. If ∆S must be negative, and the temperature T is always positive in Kelvins, then ∆H must be a very negative value to make ∆G negative. Hope this helps!
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Guys, does anyone know the answer?