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:
what it does to those around you.
Answer: 274.75 mL
Explanation:
Initial volume of gas V1 = 250.0 mL
Initial temperature of gas T1 = 30.0 C
Convert temperature in Celsius to Kelvin
(30.0°C + 273 = 303K)
New volume V2 = ?
New temperature T2 = 60.0 C
(60.0°C + 273 = 333K)
Since, volume and temperature are involved while pressure is constant, apply the formula for Charles law
V1/T1 = V2/T2
250.0 mL/303K = V2/333K
Cross multiply
250.0 mL x 333K = 303K x V2
83250 = 303V2
V2 = 83250/303
V2 = 274.75 mL
Thus, the volume will be 274.75 mL
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do you?
Answer:
H₂SO₄
Explanation:
A Brønsted acid is a proton donor. It loses protons.
This equation may be easier to understand if we write it ionically.
We see that the H₂SO₄ has lost two protons to become SO₄²⁻, so it is a Brønsted acid.