If a translucent blue copper sulfate solution is mixed with another solution and changes to a translucent lighter blue color does that mean a physical change occurred or a chemical change?
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Ответ:
Chemical reaction indicated by a change in color(blue to red), sedimentation, gas/bubbles, odor, and temperature changes. The lighter color(blue to lighter blue) is more likely to be physical changes than chemical
Ответ:
1) n(nonelectrolyte solute) = 0.656 mol.
m(C₆H₆ - benzene) = 869 g ÷ 1000 g/kg.
m(C₆H₆) = 0.869 kg.
b(solution) = n(nonelectrolyte solute) ÷ m(C₆H₆).
b(solution) = 0.656 mol ÷ 0.869 kg.
b(solution) = 0.754 mol/kg.
2) ΔT = Kf(benzene) · b(solution).
ΔT = 5.12°C/m · 0.754 m.
ΔT = 3.865°C.
Tf = 5.50°C - 3.865°C.
Tf = 1.63°C.
3) ΔTb = Kb(benzene) · b(solution).
ΔTb = 2.53°C/m · 0.754 m.
ΔTb = 1.91°C.
Tb = 80.1°C + 1.91°C.
Tb = 82.01°C.