Answer:
An energy pyramid shows the flow of energy at each trophic level in an ecosystem. A pyramid shape is used because energy is lost at each trophic level when organisms use it up.
Explanation:
Answer:
Hydroxide concentration of the sample is 1.3x10⁻⁶M
Explanation:
The equilibrium constant of water, Kw, is:
H₂O(l) ⇄ H⁺(aq) + OH⁻(aq)
Kw is defined as:
Kw = 1.7x10⁻¹² = [H⁺] [OH⁻]
As the sample is of pure water, both H⁺ and OH⁻ ions have the same concentration because come from the same equilibrium, that is:
[H⁺] = [OH⁻]
We can write the Kw expression:
1.7x10⁻¹² = [OH⁻] [OH⁻]
1.7x10⁻¹² = [OH⁻]²
1.3x10⁻⁶M = [OH⁻]
<h3>Hydroxide concentration of the sample is 1.3x10⁻⁶M</h3>
Answer:
a) pH = 11.5
b) pH= 3
Explanation:
a) lets calculate the number of moles of each reactant
moles of HCl = 32/1000 * 0.32 = 0.01024 mole
moles of NaOH = 42/1000 * 0.32 = 0.01344 moles
1 moles of HCl reacts with 1 moles of NaOH , so 0.01024 mole of HCl should react with 0.01024 moles of NaOH , but there is some excess NaOH.
excess NaOH= 0.01344 -0.01024 = 0.0032 moles
[H+]= 
pH= -log [3.125*10^-12) = 11.5
b) moles of NaOH = 0.00924
excess HCl present = 0.01024 - 0.00924 =.001
so excess [H+] = 0.001
pH= -log( 0.001) = 3
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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Chemical energy in the coal is converted into thermal energy in the exhaust gases of combustion
thermal energy of the exhaust gas is converted into thermal energy of steam through heat exchange
