Answer:
Electromagnetic Wave Medium Matter:The ability to move or change an object, or what a wave
Longitudinal Wave Trough Rarefaction: The area in a longitudinal wave where the particles are close together.
Transverse Wave Energy Wavelength: The highest point of a transverse wave
Explanation:
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Answer:
He was the first scientist to observe and describe bacteria and protozoa by looking at a drop of water from a pound under a microscope. He also was the one to build the first compound microscope.
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Radius of Xenon = 1.3Ă—10â’8 cm
Volume = 100 ml = 0.1 L
Pressure P = 1.2 atm = 121.59 Kpa
Temperature = 281 K
R = Gas Constant = 8.31 J mol^-1 K^-1
Now find the number of atoms
PV = nRT => n = PV / RT
n = (121.59 x 0.1) / (8.31 x 281) = / 2335.11 = 0.0052
Number of atoms in a mole is same as Avogadro constant A, which is 6.02 x
10^23 particles.
n = number of atoms= 0.0052
N = number of particles
Avogadro constant A = 6.02 x 10^23
n = N/A => N = n x A = 0.0052 x 6.02 x 106^23 = 3.13 x 10^20
Volume of Xe atom which would be a sphere = (4/3) x pi x r^3
Volume = = (4/3) x 3.14 x (1.3Ă—10â’8)^3 = 9.2 x 10^-24
Volume occupied by these particles = n x Volume = 3.13 x 10^20 x 9.2 x
10^-24 = 0.00288
Fraction of volume will be = 0.00288 / 0.1 = 0.0288
Answer:
ΔHrxn = - 3294.8 KJ/mol
Explanation:
H - H H - O - H
H - H + O = O → H - O - H
broken bond:
⇒ 2 bond H - H + 1 bond O = O
bond formed:
⇒ 4 bond H - O
bond energies:
∴ H - H: 436.4 KJ/mol
∴ O = O: 494 KJ/mol
∴ H - O: 482 KJ/mol
broken bond:
⇒ bond energie = 2(436.4) + 494 = 1366.8 KJ/mol
bond formed:
⇒ bond energie = 4(- 482) = - 1928 KJ/mol
- ΔHrxn = ∑ΔHproducts - ∑ΔHreagent
⇒ ΔHrxn = - 1928 KJ/mol - (1366.8 KJ/mol)
⇒ ΔHrxn = - 3294.8 KJ/mol
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