Answer:
Plates sliding past each other cause friction and heat. Subducting plates melt into the mantle, and diverging plates create new crust material. Subducting plates, where one tectonic plate is being driven under another, are associated with volcanoes and earthquakes.
Explanation:
Answer : The enthalpy change for converting 1 mole of ice at 
to water at 
is, 7.712 KJ
Solution :
Process involved in the calculation of enthalpy change :
Now we have to calculate the enthalpy change.
![\Delta H=[m\times c_{ice}\times (T_2-T_1)]+\Delta H_{fusion}+[m\times c_{water}\times (T_3-T_2)]](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5Bm%5Ctimes%20c_%7Bice%7D%5Ctimes%20%28T_2-T_1%29%5D%2B%5CDelta%20H_%7Bfusion%7D%2B%5Bm%5Ctimes%20c_%7Bwater%7D%5Ctimes%20%28T_3-T_2%29%5D)
where,
= enthalpy change
m = mass of water = 
= specific heat of ice = 2.09 J/gk
= specific heat of water = 4.18 J/gk
= enthalpy change for fusion = 6.01 KJ/mole = 0.00601 J/mole
conversion : 
= initial temperature of ice =
= final temperature of ice = 
= initial temperature of water =
= final temperature of water = 
Now put all the given values in the above expression, we get
![\Delta H=[18g\times 2.09J/gK\times (273-248)k]+0.00601J+[18g\times 4.18J/gK\times (363-273)k]](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5B18g%5Ctimes%202.09J%2FgK%5Ctimes%20%28273-248%29k%5D%2B0.00601J%2B%5B18g%5Ctimes%204.18J%2FgK%5Ctimes%20%28363-273%29k%5D)
(1 KJ = 1000 J)
Therefore, the enthalpy change for converting 1 mole of ice at to water at is, 7.712 KJ
Answer:
Here
Explanation:
When the atom absorbs energy, it can move to a higher energy state, or excited state. Under what circumstances can an atom emit a photon? A photon is emitted when an atom moves from an excited state to its ground state or to a lower-energy excited state.
Answer:
1 g of Carbon
Explanation:
This is because because carbon has lower molar mass than thorium or copper so a 1-g sample of carbon contains more atoms than 1 g of cobalt or lead.
Answer:
MIXTURE
Explanation:
A mixture is a substance composed of a combination of other different substances. These component(s) of a mixture are physically combined, meaning that there is no chemical linkage between the individual components/constituents of a mixture.
This is the case of the gravel described in this question. The components of gravel can be separated using physical means because they are not chemically bonded to one another, hence, no chemical reactions are needed to separate different parts of gravel into pure substances. This makes gravel a MIXTURE.
