Answer:
Option 2 is correct.
Scintillation counters and Geiger Counters provide instantaneous measure of radioactivity.
Explanation:
Of the three means of measuring radioactivity presented. Only Film-badge dosimeter lacks a sensitive photo-detector piece that instantaneously converts the amount of radiation seen into electrical waves. It collects the radiation over time and the film is then developed after a particular point in time for the radioactivity collected to be measured.
Although used majorly for gamma rays and neutrons, the scintillation counters uses a scintillator to convert ionizing radiation (like the two mentioned at the start of this passage), into photons that the photo-detector (usually very sensitive) converts into electrical signals for immediate reading. It gives the energy and intensity of the radiation intended to.be measured.
The Geiger Muller counter, the most used measure of radioactivity across all fields, uses the tube (which contains inert gases) as the sensitive radiation detecting piece. High voltage maintained in the tube makes the gases conductive and it transmits the intemsity of radiation to the processing part of the counter which converts this reading to electrical signals, immediately for reading. Unlike the scintillation counters, it doesn't measure the energy of the radiation.
Hope this Helps!!!
2SO₂+O₂⇒2SO₃ ΔH=-197 kJ
<h3>Further explanation</h3>
Based on the principle of Hess's Law, the change in enthalpy of a reaction will be the same even though it is through several stages or ways
Reaction
2SO₂+O₂⇒2SO₃
Given :
1. S(s)+O₂(g)→SO₂(g) ΔH = -297 kJ
Reverse
SO₂(g) ⇒S(s)+O₂(g ΔH = +297 kJ
(sign change to +) x 2
2SO₂(g) ⇒2S(s)+2O₂(g ΔH = +594 kJ
2.2S(s)+3O2(g)→2SO3(g) ΔH=-791kJ
Add both reactions and remove/subtract the same compound for different sides
1. 2SO₂(g) ⇒2S(s)+2O₂(g) ΔH = +594 kJ
2.2S(s)+3O₂(g)→2SO₃(g) ΔH=-791kJ
--------------------------------------------------------+
2SO₂+O₂⇒2SO₃ ΔH=-197 kJ
We can prepare CaCO₃ and MgO from dolomite.
<h3 /><h3>
What is Dolomite?</h3>
- Common rock forming mineral is called dolomite.
- It's chemical composition is CaMg(CO₃)₂.
- The component of the sedimentary rock is called dolostone.
- It is the primary component of the metamorphic rock known as dolomitic marble.
- Limestone that contains some dolomite is known as dolomitic limestone.
Dolomite is a mineral which is rarely found in the environment , but dolostones are the minerals which are very commonly found.
<h3>Properties of Dolomite:</h3>
- The trigonal-rhombohedral system is used to crystallise dolomite
- It forms crystals that are white, tan, green, or pink in colour.
- Dolomite is a double carbonate of calcium and magnesium ions arranged in an alternating structural structure.
- Granular dolomite is a medium to dark grey, brown, or white granular dolomite found in rocks.
- The lustre varies from dull to subvitreous. Dolomite, like calcite, cleaves into six-sided polyhedrons with diamond-shaped faces.
- Dolomite vein grains may be several centimetres in diameter.
<h3>Uses of Dolomite:</h3>
- Ornamental stone is used as Dolomite, and a magnesium oxide source, as well as used in the Pidgeon magnesium production process.
- Dolomite is often used in place where calcite limestone is used as as a flux for the smelting of iron and steel when calcite limestone is not available or very expensive.
- Therefore, it is also called dolomite limestone.
- Dolomite and dolomitic limestone are often used in horticulture as a pH buffer and magnesium source in soils .
- Calcined dolomite is also used as a catalyst invery high-temperature gasification of biomass in order to kill tar.
<h3>Preparation of CaCO₃ and MgO from dolomite:</h3>
- Dolomite is a double salt which consists of calcium carbonate (CaCO3) and magnesium carbonate (MgO) and it is one of the two forms of limestone.
- This dolomite is found in the Bangkalan area, which only used in landfill and used to make light stone. Existence the great potential for dolomite as a biomaterial then in this research was carried by making CaCO3/MgO from dolomite using a simple calcination method at 600°C, 700°C and 800°C for one hour From the results of XRD found that the CaCO3/MgO phase was formed optimally at a temperature of 700°C.
Thus from the above conclusion we can say that, we can prepare CaCO₃ and MgO from dolomite.
Learn more about Dolomite here :brainly.com/question/10283539
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