Answer:
439.7nm
Explanation:
Energy of a quantum can be calculated using below formula
E=hv...........eqn(1)
But v=λ/ c .........eqn(2)
If we substitute eqn(2) into eqn(1) we have
E= hc/(λ)
Where E= energy
h= Plank's constant= 6.62607004 × 10-34 m2 kg / s
c= speed of light
c= 2.998 × 10^8 m/s
λ= wavelength= ?
But the energy was given in Kj , it must be converted to Kj/ photon for unit consistency.
Energy E= 272 kJ/mol × 1mol/6.02× 10^23
Energy= 451.83× 10^-24 Kj/ photon
E= hc/(λ)...........eqn(1)
If we make λ subject of the formula
λ= hc/E
Then substitute the values we have
λ= [(6.626 × 10^-34) × (2.998 × 10^8)]/451.83× 10^-24
λ=(0.00043965) × (1Kj/1000J) × (10^9nm/1m)
λ=439.7nm
Hence, the longest wavelength of radiation with enough energy to break carbon-sulfur bonds is 439.7nm
Chemical equation
<h3>
What is a chemical equation?</h3>
- The reactants and products of a chemical reaction are represented symbolically in a chemical equation by the appropriate chemical formulas.
- A chemical equation that illustrates how Calcium oxide (quicklime) and carbon dioxide are produced during the breakdown of limestone.
CaCo3 → CaO+ CO2 (Decomposition reaction)
- The portion of the chemical equation on the reactant side is to the left of the symbol "→," and the portion on the product side is to the right of the arrow symbol.
<h3>
Decomposition reaction:-</h3>
A chemical reaction that results in the breakdown of one reactant into two or more products is known as a decomposition reaction.
Learn more about Chemical equations here:-
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Answer:
:)
Explanation:
Recycling paper helps to reduce greenhouse gas emissions that can contribute to climate change. It takes 70% less energy and water to recycle paper than to create new paper from trees. Manufacturing with recovered paper cuts down on pollution that contributes to smog (and ill health).
Answer:
5.5
Explanation:
Phenol is a weak acid that dissociates according to the following reaction.
C₆H₅OH(aq) ⇄ C₆H₅O⁻(aq) + H⁺(aq)
The pKa is 9.90. The acid dissociation constant (Ka) is:
pKa = -log Ka
Ka = antilog -pKa = antilog -9.90
Ka = 1.26 × 10⁻¹⁰
Given the concentration of the acid, Ca = 0.10 M, and the Ka, We can find [H⁺] using the following expression.
[H⁺] = √(Ka × Ca)
[H⁺] = √(1.26 × 10⁻¹⁰ × 0.10)
[H⁺] =3.5 × 10⁻⁶ M
The pH is:
pH = -log [H⁺]
pH = -log 3.5 × 10⁻⁶
pH = 5.5
Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density. ... Cold water is more dense and will sink in room-temperature water.