The right answer for the question that is being asked and shown above is that: "(2) the cathode in a voltaic cell and the anode in an electrolytic cell." At the status of electrode does oxidation occur in a voltaic cell and in an electrolytic cell is that the cathode in a voltaic cell and the anode in <span>an electrolytic cell</span>
Write the symbols for the cation and the anion: Mg and Cl.
Determine the charge on the cation and anion. If the cation has a Roman numeral after it, that is the charge on that cation. ...
Determine formula.
Answer:
a) Approximate boiling point of HBr = -60.15 °C
b) Approximate boiling point of AsH₃ = -52.25 °C
Explanation:
Döbereiner stated that some elements could be arranged in groups of 3 similar elements ( known as "triads) , and the element of the middle ( elements are ordered with respect to their atomic mass) would have properties between the other 2 ( the average value)
a) In the first case the triad would be the halogen triad ( Cl , Br and I ) . And according to Döbereiner , the boiling point of HBr should be the average of HCl and HI . Therefore
Approximate boiling point of HBr = [(- 84.9°C) + (-35.4°C)]/2 = -60.15 °C
b) Simmilarly for AsH₃ , PH₃ and SbH₃ , the boiling point of AsH₃ would be
Approximate boiling point of AsH₃ = [(- 87.4°C) + (-17.1°C)]/2 = -52.25 °C
The nitrate reduction test identifies whether the given strain of bacteria is able to reduce nitrate to nitrite using anaerobic respiration.
In this test, the solution is incubated after adding the bacteria strain. After the incubation period is over, additional solutions Sulfuric acid (a) and Naphthylamine (b) are added to it.
If the reduction has occurred and the nitrite is present, then the solution gives red color.
If there is no color change, then the solution is tested for the presence of other reduction products like N2 gas , NH3 gas etc. This is done by adding zinc to the solution.
Zinc is able to reduce nitrate to nitrite only. Therefore a color change after the addition of zinc indicates that the bacterial strain was not able to reduce nitrate and nitrates are still present which were reduced by zinc.
If there is no color change, that means the nitrates are absent and the bacteria has reduced nitrate to some other species like N2 or NH3 gas.
Therefore , In the nitrate reduction test, only after the addition of zinc to your 24-hour incubated solutions a and b is there a color change. This indicates that the bacteria was not able to reduce nitrate to nitrite.
