Answer:
Explanation:
Metal elements form positively charged ions called cations because they are located on the left side of the periodic table These elements all have valence electrons in an s orbital. These electrons are relatively easy for the atom to lose to achieve a stable octet of electrons in its outermost energy shell.
Answer:
In the same way, a solution with a pH of 5 contains 10-5mol/l of hydrogen ions, a solution with a pH of 6 contains 10-6mol/l of hydrogen ions, while the solution with a pH of 7 contains 10-7mol/l of hydrogen ions.
Explanation:
The answer to this question is A- evaporation
Answer:
B
Explanation:
For solving this we need a heat balance
![Q_{a} = Q_{b}\\m_{a}*C_{a}*\Delta T_{a} = m_{b}*C_{b}*\Delta T_{b}](https://tex.z-dn.net/?f=Q_%7Ba%7D%20%3D%20Q_%7Bb%7D%5C%5Cm_%7Ba%7D%2AC_%7Ba%7D%2A%5CDelta%20T_%7Ba%7D%20%3D%20m_%7Bb%7D%2AC_%7Bb%7D%2A%5CDelta%20T_%7Bb%7D)
By changing the corresponding relations, we have
![m_{a}*C_{a}*\Delta T_{a} = \frac{1}{2}m_{a}*4C_{a}*\Delta T_{b} \\\\\\](https://tex.z-dn.net/?f=m_%7Ba%7D%2AC_%7Ba%7D%2A%5CDelta%20T_%7Ba%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dm_%7Ba%7D%2A4C_%7Ba%7D%2A%5CDelta%20T_%7Bb%7D%20%5C%5C%5C%5C%5C%5C)
By cancelling similar factor, we obtain
![\Delta T_{a} = 2 \Delta T_{b}\\\frac{\Delta T_{a}}{\Delta T_{b}} = 2\\](https://tex.z-dn.net/?f=%5CDelta%20T_%7Ba%7D%20%3D%202%20%5CDelta%20T_%7Bb%7D%5C%5C%5Cfrac%7B%5CDelta%20T_%7Ba%7D%7D%7B%5CDelta%20T_%7Bb%7D%7D%20%3D%202%5C%5C)
Which means that the change of temperature in A is twice the change of B