Answer: <em>The hydrogen spectrum is an important piece of evidence to show the quantized electronic structure of an atom. ... It results in the emission of electromagnetic radiation initiated by the energetically excited hydrogen atoms. The hydrogen emission spectrum comprises radiation of discrete frequencies.</em>
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Explanation: hope this helps ;D
Answer:
I believe the answer is A: *It is the simplest form of matter" not 100% sure but I think that's correct
Explanation:
Crystalline Polymer = a polymer in a solid structure which is ordered.
Amorphous Polymer = a polymer without a clearly defined shape/form
Thermal Energy
Thermal energy is the energy that comes from heat. This heat is generated by the movement of tiny particles within an object. The faster these particles move, the more heat is generated
Total volume required = 100mL
The concentration of carbonic acid = 0.025
Let concentration of sodium bi carbonate = [NaHCO3]
From Hendersen Hassalbalch's equation for buffers
pH = pKa + log [salt] / [acid]
pKa of carbonic acid = 6.35
7.25 = 6.35 + log [NaHCO3] / 0.025
0.9 = log [NaHCO3] / 0.025
Taking antilog
7.943 = [NaHCO3] / 0.025
[NaHCO3] = 7.943 X 0.025
[NaHCO3] = 0.199 M
Volume is 100mL
Moles of NaHCO3 = molarity X volume (L) = 0.199 X 0.1 = 0.0199
Mass of NaHCO3 = moles X molar mass = 0.0199 X 84 = 1.672 g
moles of H2CO3 = molarity X volume (L) = 0.025 X 0.1 = 0.0025
Mass of H2CO3 = moles X molar mass = 0.0025 X 62 = 0.155 g