<h3><u>Answer:-</u></h3>
3. <u>Proton</u> is the subatomic particle which accounts for most of an atom's mass.
4. <u>Electrons</u> are the subatomic particle which accounts for most of atoms volume.
Answer:
Measuring a pencil in meters would be very difficult, as a single meter is much longer than one pencil. Also, measuring a hallway in millimeters would be very difficult considering how small millimeters are in comparison to a hallway. However, if you switch these two then they would work very well.
Answer:
a) Platinum > Beryllium > Aluminum > Magnesium > Potassium > Cesium
b) Cesium > Potassium > Magnesium > Aluminum > Beryllium > Platinum
c) Cesium > Potassium
Explanation:
We must recall that the frequency of an electromagnetic wave is directly proportional to its energy. Hence as the work function of the metal increases, the minimum frequency required for emission of electrons occur increases accordingly.
Similarly, the maximum wavelength required for electron emission to occur varies inversely as the work function of the metal hence the answer provided.
Lastly, only caesium and potassium has work function less than the energy of the incident photon hence only these two metals experience electron emission with the kinetic energy of electrons emitted from caesium greater than that emitted from potassium.
Answer : The partial pressure of is 102.3 mmHg.
Explanation :
As per question,
Mass of = 62.9 g
Mass of = 33.2 g
Molar mass of = 18 g/mole
Molar mass of = 62 g/mole
First we have to calculate the moles of and .
Now we have to calculate the mole fraction of and .
Now we have to partial pressure of .
According to the Raoult's law,
where,
= partial pressure of water vapor
= total pressure of gas
= mole fraction of water vapor
Therefore, the partial pressure of is 102.3 mmHg.
Answer :
- <u>Part A :</u> The given unbalanced redox reaction is,
Now we have to balance the given redox reaction in acidic medium by half reaction method.
1st half reaction :
2nd half reaction :
For net balanced reaction, 1st half reaction is multiplying by 8 and 2nd half reaction is multiplying by 5
The net balanced redox reaction is,
- <u>Part B :</u> The given unbalanced redox reaction is,
Now we have to balance the given redox reaction in basic medium by half reaction method.
1st half reaction :
2nd half reaction :
For net balanced reaction, 1st half reaction is multiplying by 2.
The net balanced redox reaction is,