Answer:
I deeply believe that it would be options 1, 2, and 4? Sorry if i'm wrong and good luck!
Answer:
prototype
Explanation:
don't go right to designing the original thing
Body fossils are exactly what they sound like of the body which includes bones,shell, teeth, skin impression,etc.
Trace fossils are fossils such as footprints, corpolites, etc, which are traces of prehistoric animals
Answer : The energy change for the reaction is CsCl is, 95 KJ/mole
Explanation :
The steps involved in the formation of
:
(1) Conversion of gaseous potassium atoms into gaseous potassium ions.
![K(g)\overset{\Delta H_I}\rightarrow K^{+1}(g)+1e^-](https://tex.z-dn.net/?f=K%28g%29%5Coverset%7B%5CDelta%20H_I%7D%5Crightarrow%20K%5E%7B%2B1%7D%28g%29%2B1e%5E-)
= ionization energy of potassium = 419 kJ/mol
(2) Conversion of gaseous bromine atoms into gaseous bromine ions.
![Br(g)+1e^-\overset{\Delta H_E}\rightarrow Br^-(g)](https://tex.z-dn.net/?f=Br%28g%29%2B1e%5E-%5Coverset%7B%5CDelta%20H_E%7D%5Crightarrow%20Br%5E-%28g%29)
= electron affinity energy of bromine = -324 kJ/mol
The overall reaction will be:
![K(g)+Br(g)\rightarrow K^+(g)+Br^-(g)](https://tex.z-dn.net/?f=K%28g%29%2BBr%28g%29%5Crightarrow%20K%5E%2B%28g%29%2BBr%5E-%28g%29)
To calculate the overall energy change the expression used is:
![\Delta H=\Delta H_I+\Delta H_E](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5CDelta%20H_I%2B%5CDelta%20H_E)
Now put all the given values in this equation, we get:
![\Delta H=419KJ/mole+(-324KJ/mole)](https://tex.z-dn.net/?f=%5CDelta%20H%3D419KJ%2Fmole%2B%28-324KJ%2Fmole%29)
![\Delta H=95KJ/mole](https://tex.z-dn.net/?f=%5CDelta%20H%3D95KJ%2Fmole)
Therefore, the energy change for the reaction is CsCl is, 95 KJ/mole