In Bohr's atomic model, the electrons are orbiting outside in orbitals around the nucleus. The farther the electron is from the nucleus, the lower its energy level becomes. That is why when reactions occur, it is the valence electrons (outermost electrons) that gets involve in the bonding. The way you write an electronic configuration is how the energy levels decreases. The first is orbital 1s which is the highest energy level because it is nearest to the nucleus. Then, it is followed by 2s2p, and so on and so forth. The energy levels are represented by the numbers.
When electrons transfer from orbital to orbital, they may release (high to low) or absorb (low to high) energy in the form of light which can be measuredin wavelength. The formula to be used is Rydberg's formula:
1/λ = R(1/n₁² - 1/n₂²), where
λ is wavelength measured in meters
n₁ and n₂ are the energy levels such that n₂>n₁
R is the Rydberg constant equal to 1.097×10⁷ m⁻¹
1/λ =1.097×10⁷ m⁻¹ (1/2² - 1/4²)
λ = 4.86×10⁻⁷ or 4.86 pm
Percent error is an expression that is used as a tool for determining the precision of your calculations. It is calculated by the absolute value of the difference of experimental and theoretical values over the theoretical values multiplied by 100%. Hope this helps.
Use stoichometry to calculate this. In order to calculate this answer, you need to divide the grams by the molar mass of sodium bromide. The molar mass of sodium bromide is approximately 103 g/mol. 0.50/103 equates to about 0.00485 moles of sodium bromide.
Explanation for each.
A) if heat is removed.. the reaction would want to produce more heat and hence reaction will shift backward causing a decrease in PCl3.
B)if Cl2 is added..the reaction will shift in such a direction such to decrease the amount of Cl2..so backward ..again PCl3 will decrease.
C)Reactant :product is 1:2.. wrong as increase pressure imply decrease volume...
D) is correct as if the Pcl3 is removed .. more PCl3 will be produced
Answer: Option <span>D. Uranium is mined from rock.
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Reason:
Energy sources falls into following two categories
(i) nonrenewable and
(ii) renewable.
Nonrenewable energy resources includes nuclear, coal, oil, and natural gas. These sources of energies are available in limited supplies. This is because it takes long for them to be replenished. On other hand, renewable resources are replenished at relatively short periods of time. These includes </span><span>wood, water, </span>solar energy<span> and </span>biomass.
Thus, among the available options, <span>Uranium is a non-renewable source of energy. </span>
