Answer 19.9g. I’ve took the test last week at my uncle randy’s house
POH = - log [ OH-]
pOH = - log [ 1 x 10⁻¹²]
pOH = 12
The answer is; D
Enthalpy is the system’s internal energy ( considering the product of its pressure and volume). When the enthalpy is negative, it means that the products have a lower energy level than the reactants - meaning the system has dispensed some energy into the environment.
Answer:
Explanation:
Using the expression for the photoelectric effect as:
Also, 
Applying the equation as:
Where,
h is Plank's constant having value 
c is the speed of light having value 
is the wavelength of the light being bombarded
Given, 
is the binding energy or threshold energy
is the kinetic energy of the electron emitted. = 
Thus, applying values as:
