Resources are categorized as renewable or non-renewable. A renewable resource may replenish at the rate it is being used, while a non-renewable resource has a limited supply.
<u>Explanation:</u>
<u>Renewable Energy:</u>
- It is the energy that is obtained from natural resources like sun, wind, etc..
- It is the cleanest form of energy.
- 15% of the world's total energy depends upon renewable energy.
<u>Advantages of renewable energy:</u>
- Renewable energy is free to use and it is available in the abundant quantity.
- They produce low carbon emissions and it does not affect the environment.
<u>Dis-Advantages of renewable energy:</u>
- The initial step cost much like setting up the windmill and solar panels to obtain energy.
- Solar energy needs backup during the winter season.
<u>Non-Renewable Energy</u>
- A natural resource or source of energy existing finite quantity and not capable of being replenished.
- They are not environmentally friendly and it leads to environmental issues.
<u>Advantages of Non-Renewable Sources:</u>
- The Non-Renewable Sources is considered as cheap to use.
- They produce a tremendous amount of energy
<u>Disadvantages of Non-Renewable Sources:</u>
- Non-renewable sources release toxic gases in the air when burnt which are the major cause of global warming.
Answer:
The standard enthalpy of formation of NOCl(g) at 25 ºC is 105 kJ/mol
Explanation:
The ∆H (heat of reaction) of the combustion reaction is the heat that accompanies the entire reaction. For its calculation you must make the total sum of all the heats of the products and of the reagents affected by their stoichiometric coefficient (number of molecules of each compound that participates in the reaction) and finally subtract them:
Enthalpy of the reaction= ΔH = ∑Hproducts - ∑Hreactants
In this case, you have: 2 NOCl(g) → 2 NO(g) + Cl₂(g)
So, ΔH=
Knowing:
- ΔH= 75.5 kJ/mol
- = 90.25 kJ/mol
- = 0 (For the formation of one mole of a pure element the heat of formation is 0, in this caseyou have as a pure compound the chlorine Cl₂)
- =?
Replacing:
75.5 kJ/mol=2* 90.25 kJ/mol + 0 -
Solving
-=75.5 kJ/mol - 2*90.25 kJ/mol
-=-105 kJ/mol
=105 kJ/mol
<u><em>The standard enthalpy of formation of NOCl(g) at 25 ºC is 105 kJ/mol</em></u>
What biochemical reaction??
Answer:
SN2 mechanism
Explanation:
This is a situation were substitution occurs with inversion of configuration at the chiral centers which proceed through concerted backside attack where nucleophile approaches the alkyl halides 180° from c-br bond, as c-(nucleophile) bond forms , the c -(leaving group) bond breaks.
8 electrons are in the third level
Electrons in this level are called valence electrons
Valence electrons are used in any and all chemical reactions