For a beaker containing the reaction below that is at equilibrium, using lechatlier's principle, predict which way the equilibrium conditions will shift (type in left, right, or no change) if silver chloride was added to a beaker.
agno3 (aq) + nacl (aq) → agcl (s) + nano3 (aq)

Explanation:

LeChatlier's principle states that any  change in pressure, temperature, or concentration of a reactant applied to a system in equilibrium, the equilibrium will shift so as to tend to counteract the effect of the change.

In our question, is added.

is a product.

When product concentration increases,the reaction goes to the left so as to decrease the product concentration.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

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.