Question 5 options: The cell potential for an electrochemical cell with a Zn, Zn2 half-cell and an Al, Al3 half-cell is V. Enter your answer to the hundredths place and do not leave out a leading zero, if it is needed.

The voltage is  

Explanation:

Generally the half reaction for Zn, Zn2 half-cell is mathematically represented as

      ⇔      (reference study academy)

and the electric potential for this is a constant value

Generally the half reaction for Al, Al3 half-cell is mathematically represented as

       ⇔  

and the electric potential for this is constant value  

Therefore the cell potential for an electrochemical cell  is mathematically represented as

substituting values

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.