Answer:
The equation for the Kinetic Energy, 
, of the photo-emitted electrons is given as follows;
Please find attached the required plot of the kinetic energy versus the frequency
Explanation:
The equation for the Kinetic Energy, , of the photo-emitted electrons is given as follows;
Where:
h = Planck's constant = 6.63×10⁻³⁴ J·s
f = Frequency
BE = Binding Energy = 2.71 eV for Calcium metal
f₀ = Threshold frequency for the material
The ionization energy is the energy required to free an electron from an isolated atom
The percent yield of the reaction is 41.99 % If 1.0 mol of Mg is mixed with 2.0 mol of Br2, and 0.42 mol of MgBr2 is obtained.
Explanation:
Data given:
number of moles of magnesium = 1 mole
number of moles of bromine gas = 2 moles
moles of magnesium bromide obtained = 0.42 moles
percent yield =?
balance chemical reaction:
Mg +
⇒ Mg
1 mole of Mg reacted to give 1 mole of Mg
1 mole of Br2 reacted to give 1 moles of Mg
2 moles of Br2 reacted to give 2 moles of Mg
limiting reagent is Mg
so, mass obtained by 1 mole Mg = 1 x 184.11
mass obtained = 184.11 (theoretical yield)
actual yield = 0.42 x 184.11
actual yield = 77.32 grams
percent yield =
x 100
putting the values in the equation:
x100
percent yield = 41.99 %
Answer:
Sublimate
Explanation:
The solid obtained at the neck of a funnel in sublimation is called the sublimate.
This substance is a solid.
- Sublimation process is a phase change.
- In this process, a solid is directly changed to gas or gas changed to solid.
- Heat must be added to change the solid to gas and heat removed for the reverse process.
- Not all substances have this capability.
