Answer:
3,200 joules
Explanation:
q = mcΔT = (250.0 g)(0.128 j/g°C)(100°C -25°C) = 3,200 joules
Answer:
V2 = 600ml
Explanation:
dilution principle formula
M1V1 = M2V2
C1V1 = C2V2
3 X 20 = 0.1 x V2
60 = 0.1 x V2
V2 = 60/0.1
V2 = 600ml
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Answer :
AgBr should precipitate first.
The concentration of 
when CuBr just begins to precipitate is, 
Percent of remains is, 0.0018 %
Explanation :
for CuBr is 
for AgBr is 
As we know that these two salts would both dissociate in the same way. So, we can say that as the Ksp value of AgBr has a smaller than CuBr then AgBr should precipitate first.
Now we have to calculate the concentration of bromide ion.
The solubility equilibrium reaction will be:
The expression for solubility constant for this reaction will be,
![K_{sp}=[Cu^+][Br^-]](https://tex.z-dn.net/?f=K_%7Bsp%7D%3D%5BCu%5E%2B%5D%5BBr%5E-%5D)
![4.2\times 10^{-8}=0.073\times [Br^-]](https://tex.z-dn.net/?f=4.2%5Ctimes%2010%5E%7B-8%7D%3D0.073%5Ctimes%20%5BBr%5E-%5D)
![[Br^-]=5.75\times 10^{-7}M](https://tex.z-dn.net/?f=%5BBr%5E-%5D%3D5.75%5Ctimes%2010%5E%7B-7%7DM)
Now we have to calculate the concentration of silver ion.
The solubility equilibrium reaction will be:
The expression for solubility constant for this reaction will be,
![K_{sp}=[Ag^+][Br^-]](https://tex.z-dn.net/?f=K_%7Bsp%7D%3D%5BAg%5E%2B%5D%5BBr%5E-%5D)
![7.7\times 10^{-13}=[Ag^+]\times 5.75\times 10^{-7}M](https://tex.z-dn.net/?f=7.7%5Ctimes%2010%5E%7B-13%7D%3D%5BAg%5E%2B%5D%5Ctimes%205.75%5Ctimes%2010%5E%7B-7%7DM)
![[Ag^+]=1.34\times 10^{-6}M](https://tex.z-dn.net/?f=%5BAg%5E%2B%5D%3D1.34%5Ctimes%2010%5E%7B-6%7DM)
Now we have to calculate the percent of remains in solution at this point.
Percent of remains = 
Percent of remains = 0.0018 %
A-leads to the abrasion of rocks and minerals
A-dense vegetation cover
True
Explanation:
Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils.
Agent of weathering are wind, water and glacier.
Chemical weathering contributes to physical weathering in that it leads to the abrasion of rocks and minerals.
During chemical weathering, a rock chemically combines with materials in the environment and weakens it.
When physical weathering processes are induced, grains produced independently weakening of bonds in rocks grind against one another and wears each other off.
An area with a dense vegetation cover undergoes rapid chemical weathering:
- Plant roots penetrates deep into the rock and increases the surface area of chemical action.
- Plants produce chemicals that combines with rocks and causes them to decay.
- Since the area is always moist, chemical action becomes more severe.
Buildings and statues made of stone are subjected to the same degree of weathering as rocks exposed naturally.
This is true.
Statues and buildings weather just like rocks we find in nature.
It is the same sunshine and rain that impacts rocks that also impacts buildings and statues.
So they degrade at the same rate except they are protected.
learn more:
Erosion brainly.com/question/2473244
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Overuse of the same chemicals can result in the pest becoming immune to the pesticides.
