Calcium carbonate is neither acid nor base, it's a SALT.
Answer:
the possibility of contamination in the laboratory is minimized
Explanation:
When a particular laboratory equipment is used for a given purpose, it can not be used four another purpose until it has been thoroughly washed. This is done in order to avoid contamination when the equipment is subsequently used for a different purpose.
Hence, if a laboratory equipment is not properly cleaned and stored after use, they remain contaminated and give inaccurate results when subsequently used.
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
Answer:
Ba3N2
Explanation:
valency of barium is+2and nitrogen is-3.