Answer: The distillation flask being heated in a heating mantle. The vapors condense and drip from the condenser into the flask. As the distillate begins to drop from the condenser, the temperature observed on the thermometer should be changing steadily.
Explanation:
answer above
Answer:
1.26 × 10¹⁵ s⁻¹
Explanation:
Work function is the minimum energy required to remove an electron from the surface of metal
energy of the electron = hf - Φ
Φ = work function = hf₀ where f₀ = threshold frequency
f₀ = Φ / h where h ( Planck constant = 6.626 × 10⁻³⁴ Js)
Φ = 5.22eV = 5.22 × 1 eV where 1 eV = 1.60217662 × 10⁻¹⁹ J
Φ = 5.22 × 1.60217662 × 10⁻19 J = 8.363362 × 10⁻¹⁹ J
f₀ = (8.363362 ×10⁻¹⁹ J) / (6.626× 10⁻³⁴ Js) = 1.26 × 10¹⁵ s⁻¹
The frequency must be greater than the 1.26 × 10¹⁵ s⁻¹ to observe the emission
<h3>Pressure has additive properties meaning that if you add the partial pressures together, you obtain total pressure. P total = P1 + P2 + P3 + ... Pressure of container = pressure of H2 + Pressure of N2 + Pressure of F2 = 3atm + 2atm + 5atm = 10atm Hope that helped. ;)</h3>
Heat required : Q = 83500 J = 83.5 kJ
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Further explanation
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Given
mass ice = 250 g at 0°C
Required
The heat required
Solution
The heat to change the phase can be formulated :
Q = m.Lf (melting/freezing)
Lf=latent heat of fusion
Input the value :
Q = 250 g x 334 J/g
Q = 83500 J
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