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True or false The molar enthalpy values and fusion stay the same if you were to reverse the process?
True. The molar enthalpy values for fusion (also known as the enthalpy of fusion) are independent of the direction of the process. This means that the enthalpy change for melting a substance is equal in magnitude, but opposite in sign, to the enthalpy change for freezing the substance.
What does it mean to say that the hydrogen atom has discrete energy level?
It means that the energy of the electron in a hydrogen atom can only have specific, quantized values. These energy levels are defined by the electron's distance from the nucleus and are distinct from each other. When the electron transitions between these levels, it emits or absorbs photons of specific energies.
What group of elements give off the most energy when they gain an electrons?
Group 8A, the noble gases because they have high electron affinity.
What change takes place as you move down in group 17 of periodic table in electron gain enthalpy?
on moving down the group the atomic size as well as nuclear charge inreases.But the effect of increase in atomic size is much more pronounced than that of nuclear charge and thus the additional electrons feels less attraction consequently electron gain enthalpy becomes less negative on going down the group
What is the statement that niels bohr made about the angular momentum of the electron in the hydrogen atom?
Niels Bohr's statement about the angular momentum of the electron in the hydrogen atom is that the angular momentum of the electron is quantized and can only take on certain specific values that are integer multiples of Planck's constant divided by (2\pi). This formed the basis of the Bohr model of the atom, which helped explain the stability of atoms and the discrete nature of their energy levels.
What is the significance of isolated gaseous atom while defining the ionization enthalpy?
isolated gaseous atoms ionization enthalpy is taken as reference value and its required to compare this values to various ions of this elements and to compare this values with various elements
The ionization energy for sodium is 496 kJmol The electron affinity for chlorine is -349 kJmol what is the enthalpy?
The enthalpy change for forming sodium chloride from its elements can be calculated using the equation: Enthalpy change = Ionization energy of sodium + Electron affinity of chlorine. Plugging in the values, we get: 496 kJ/mol + (-349 kJ/mol) = 147 kJ/mol. Therefore, the enthalpy change for forming sodium chloride is 147 kJ/mol.
True or false The molar enthalpy values and fusion stay the same if you were to reverse the process?
True. The molar enthalpy values for fusion (also known as the enthalpy of fusion) are independent of the direction of the process. This means that the enthalpy change for melting a substance is equal in magnitude, but opposite in sign, to the enthalpy change for freezing the substance.
Which has a lower enthalpy ethanol or dimethyl ether?
Dimethyl ether has a lower enthalpy compared to ethanol because dimethyl ether has a simpler structure and weaker intermolecular forces, leading to lower enthalpy values. Ethanol has more complex molecular structure and stronger intermolecular forces, resulting in higher enthalpy values.
How do you calculate the enthalpy of a reaction?
To calculate the enthalpy of a reaction, you subtract the sum of the enthalpies of the reactants from the sum of the enthalpies of the products. This is known as the enthalpy change (H) of the reaction. The enthalpy values can be found in tables or measured experimentally using calorimetry.
What are some common Hess Law problems and how can they be solved?
Common Hess Law problems include determining the enthalpy change of a reaction using given enthalpy values of other reactions, and calculating the overall enthalpy change of a reaction using Hess's Law. These problems can be solved by carefully balancing the chemical equations, manipulating the given enthalpy values, and applying the principle that enthalpy changes are additive.
How to calculate the enthalpy of a reaction?
To calculate the enthalpy of a reaction, you need to find the difference between the sum of the enthalpies of the products and the sum of the enthalpies of the reactants. This is known as the enthalpy change (H) of the reaction. The enthalpy change can be determined using Hess's Law or by using standard enthalpy of formation values.
What does it mean to say that the hydrogen atom has discrete energy level?
It means that the energy of the electron in a hydrogen atom can only have specific, quantized values. These energy levels are defined by the electron's distance from the nucleus and are distinct from each other. When the electron transitions between these levels, it emits or absorbs photons of specific energies.
What is the enthalpy of air at 700 kPa and 450 K?
The enthalpy of air at 700 kPa and 450 K can be determined using specific enthalpy values for these conditions from thermodynamic tables or equations. Without specific values, it is not possible to provide an exact answer.
What is the relationship between the formation reactions that are exothermic and their corresponding enthalpy of formation values (hf)?
The relationship between exothermic formation reactions and their enthalpy of formation values is that exothermic reactions release heat energy when the compound is formed. This results in a negative enthalpy of formation value (hf) because the reaction is giving off energy.
Is the ionization enthalpy of the first two elements of isotopes same?
Ionization enthalpy of isotopes should be theoretically the same.But the recorded values aren't equal..nobody knows why..
What group of elements give off the most energy when they gain an electrons?
Group 8A, the noble gases because they have high electron affinity.
