PLEASE HELP! 1. There are four stages in the conversion of sulphur into sulphuric acid.
Stage 1: Sulphur is burnt to make sulphur dioxide.
Stage 2: Sulphur dioxide is oxidised to sulphur trioxide (the Contact Process).
Stage 3: Sulphur trioxide is dissolved in sulphuric acid to form oleum.
Stage 4: Oleum is diluted with water to form concentrated sulphuric acid.
(a) State the catalyst and give the equation for stage 2 (the Contact Process).
[3]
(b) Calculate the mass of sulphur needed to make 196 kg of sulphuric acid.
[3]
(c) Give two uses of sulphuric acid.
[2]
(d) Describe what you would see and name the products formed when dilute sulphuric acid reacts
with magnesium carbonate.
[2]​

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.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

d

explanation: