Answer:
468 h
Explanation:
Let's consider the reduction of chromium (III) to chromium that occurs in the electrolytic purification.
Cr³⁺ + 3 e⁻ → Cr
We can establish the following relations.
- 1 kg = 1,000 g
- The molar mass of Cr is 52.00 g/mol
- 1 mole of Cr is deposited when 3 moles of electrons circulate
- The charge of 1 mole of electrons is 96,468 c (Faraday's constant)
- 1 A = 1 c/s
- 1 h = 3,600 s
The hours that will take to plate 11.5 kg of chromium onto the cathode if the current passed through the cell is held constant at 38.0 A is:
Answer: 3.26x10^5L
Explanation:
P1 = 101kPa
P2 = 95kPa
T1 = 27°C = 27 +273 =300k
T2 = —10°C = —10 +273 = 263k
V1 = 3.5 x 10^5 L
V2 =?
P1V1 / T1 = P2V2 /T2
(101 x 3.5 x 10^5)/300 = (95xV2)/263
300x95xV2 = 101x 3.5x10^5x263
V2 = (101x 3.5x10^5x263) /(300x95)
V2 = 3.26x10^5L
Nature of the solute and solvent - The amount of solute that dissolves depends on what type of solute it is. While only 1 gram of lead (II) chloride can be dissolved in 100 grams of water at room temperature, 200 grams of zinc chloride can be dissolved. This means that a greater amount of zinc chloride can be dissolved in the same amount of water than lead II chloride.
Temperature - Increasing the temperature not only increases the amount of solute that will dissolve but also increases the rate at which the solute will dissolve. For gases, the reverse is true. An increase in temperature decreases both solubility and rate of solution.
Pressure - Changes in pressure have practically no effect on solubility. For gaseous solutes, an increase in pressure increases solubility and a decrease in pressure decreases solubility. Example: When the cap on a bottle of soda pop is removed, pressure is released, and the gaseous solute bubbles out of solution. This escape of a gas from solution is called effervescence.
Stirring - Stirring brings fresh portions of the solvent in contact with the solute. Stirring, therefore, allows the solute to dissolve faster.
Hope this helps!! (If not I'm sorry!)
Answer:
B.
Explanation:
This is physical change as the popcorn has expanded in size.
Answer:
B.bonds are broken and new bonds are formed
