Usually polar molecules have lone pairs because of their asymmetrical distribution of charge.
you can determine a molecules polarity by using a chart showing elements different electronegativities and subtracting them
ex. NonPolar molecules have electronegativities from 0.0 to 0.2, I have polar molecules have electronegativities from 0.2-1.4.
Since the electron is de-exited from 1(st) exited state (i.e n=2) to ground state (i.e n=1) for first line of Lyman series. Since the atomic number of Hydrogen is 1. λ = 4/3⋅912 A. 1/R = 912 A
57.5 sleps
92 quibs × (5 sleps/8 quibs) = 57.5 sleps
Note that
The heating value of standard coal is about 30,080 kJ/kg
1 L of water has a mass of 1.0 kg
The mass of 15 L of water = 15 kg.
The latent heat of vaporization of water is about 2260 kJ/kg,
The energy required to boil 15 L of water is
(2260 kJ/kg)*(15 kg) = 33900 kJ
The mass of coal required to provide this energy is
(33900 kJ)/(30080 kJ/kg) = 1.127 kg
Because 1 kg = 2.205 lb, the mass of coal required is
(1.127 kg)*(2.205 lb/kg) = 2.485 lb
Answer: 2.49 lb (nearest hundredth)
Answer:
false
Explanation:
A combustion reaction is a burning process that occurs in the presence of an oxidant and a fuel. It is usually an energy releasing procedure in which the temperature of the environment is greater than that of the reactants.
Not all combustion reactions are redox reactions
In a redox reaction, one specie is oxidized and the other becomes reduced simultaneously.
Redox reactions are usually facilitated by the transfer of electron. One specie loses electrons to be gained by another specie.
Certain atoms in a combustion reaction will have to change their oxidation state.
During combustion, during combustion reaction, there is no transfer of electrons between reactants . None of the molecules changes oxidation state. For example;
CH₄ + 2O₂ → CO₂ + 2H₂O
The algebraic sum of all oxidation number of all atoms in a neutral compound is zero.
In the reaction above, all the atoms in going from reactants to products have a net oxidation number of zero.
carbon on both sides is 0
oxygen is 0
Hydrogen is 0
So there is no transfer electrons