Answer:
Electrons have a negative charge
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Q = mCΔT
Q is heat in Joules, m is mass, C is the specific heat of water, delta T is the change in temperature
Q = (35g)(4.18)(35 degrees) = 5121 Joules or 5.12 kJ required
Answer:
ΔT = 0.61°C
Explanation:
That's the formula for the colligative property of freezing point depression:
ΔT = m . Kf . i
AlCl₃ is a ionic salt that be dissociated:
AlCl₃ → Al³⁺ + 3Cl⁻ i = 4
In solution, we can have 4 moles of ions, 1 mol of Al³⁺ plus 3 moles of chloride. (We assume 100 %ionization)
Let's replace data: ΔT = 0.082 m . 1.86 °C/m . 4
ΔT = 0.61°C
Based on the standards of units conversion, to convert from micrometer to meter, we multiply by 10^-6.
Since we there is a square (10^2) to consider, then to convert from micrometer squared to meter squared, we will multiply by (10^-6)^2 as follows:
1.5 <span>μm2 = 1.5 x (10^-6)^2 = 1.5 x 10^-12 meter sqaures</span>