State and explain the trends in the atomic radius and ionization energy for elements Li to Cs.
Answers
Explanation:
ionisation energy decrease down the group as the atomic radius increases. Nuclear charge increases. Number of shell increases so the electron will experience more shielding so it would be easier for the atom to loss electron.
Final answer:
The atomic radius increases as you move down a group from Li to Cs, while the atomic radius generally decreases as you move across a period from Li to Cs. The ionization energy decreases down a group and increases across a period.
Explanation:
The atomic radius is the size of an atom, while ionization energy is the energy required to remove an electron from an atom. In general, as we move down a group from Li to Cs, the atomic radius increases due to the addition of more energy levels. This is because the electrons occupy higher energy orbitals farther away from the nucleus. On the other hand, as we move across a period from Li to Cs, the atomic radius generally decreases. This is because the effective nuclear charge increases, pulling the electrons closer to the nucleus.
Regarding ionization energy, it generally decreases down a group from Li to Cs. This is because the atomic radius increases, therefore making it easier to remove an electron from a larger, higher energy orbital. Conversely, as we move across a period, the ionization energy generally increases. This is because the atomic radius decreases, and the electrons are held more tightly by the increasing nuclear charge.
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What is ionization energy? a. the minimum energy required to remove one electron from an atom. b. the maximum energy required to remove one electron from an atom. c. the maximum energy required to move one electron to the valence shell. d. the minimum energy required to remove one electron from another electron.
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A) How many moles of gold atoms are present in a 295-gram sample of gold? B) How many gold atoms would there be in the sample?
½N2(g) + O2(g) + 8.1 kcal → NO2(g)
½N2(g) + 3/2H2(g) → NH3(g) + 11.0 kcal
C(diamond) + O2(g) → CO2, ΔH = -94.50 kcal
Answers
Answer:
2) ½N2(g) + O2(g) + 8.1 kcal → NO2(g)
Explanation:
Chemical reactions in general can be classified as endothermic and exothermic reactions.
Endothermic reactions are accompanied by the absorption of energy. Here, the enthalpy (ΔH) change of the reaction is positive.
Exothermic reactions are accompanied by the release of energy. Here, the enthalpy (ΔH) change of the reaction is negative.
1)H2(g) + ½O2(g) → H2O(g), ΔH = -57.82 kcal
Here, ΔH is negative, hence exothermic
2)½N2(g) + O2(g) + 8.1 kcal → NO2(g)
Here, energy is being absorbed, hence endothermic
3) ½N2(g) + 3/2H2(g) → NH3(g) + 11.0 kcal
Here, energy is released, hence exothermic
4)C(diamond) + O2(g) → CO2, ΔH = -94.50 kcal
Here, ΔH is negative, hence exothermic
Answers
Answer:
Atomic models have similarities and differences
Explanation:
Hi
Dalton proposes an indivisible model of the atom.
Thomson proposes an atom formed by negative electric charges (electrons) embedded in a positive mass.
successes with your homework
large amounts of matter.
(2) Small amounts of matter are converted into
large amounts of energy.
(3) Heavy nuclei are split into lighter nuclei.
(4) Light nuclei are combined into heavier nuclei
Answers
Fusion and fission are nuclear reactions that convert a small amount of matter into a large amount of energy.
The fusion reaction is the reaction in which the molecules combine and form energy. The fission reaction is the decomposition nuclear reaction where the matter is degraded into a small entity and the energy is released.
The energy is not converted into matter in both reactions. There is no splitting or combination of nuclei in both reactions.
Thus, the small amount of matter is converted into a large amount of energy is correct.
For more information, refer to the link:
large amounts of energy occurs in both fusion and fission reactions. They are nuclear reactions where a change in the identity or characteristics of an atomic nucleus results when it is bombarded with an energetic particle, as in fission, fusion, or radioactive decay.
4.0 mol
6.0 mol
12 mol
36 mol
Answers
Answer : The correct option is, 4.0 mole
Explanation : Given,
Moles of lithium = 12 mole
The given balanced chemical reaction is:
By the stoichiometry we can say that, 6 moles of Li react with 1 mole of to give 2 moles of
As, 6 moles of lithium react to give 2 moles of lithium nitride
So, 12 moles of lithium react to give moles of lithium nitride
Therefore, the number of moles of lithium nitride produced will be 4.0 mole.
2: Chlorine free radicals are produced in the upper atmosphere when ultraviolet radiation interacts with chlorofluorocarbons (CHCs). The free radicals catalyze the conversion of ozone to oxygen. How is this catalysis harmful to humans
Answers
1. By using less energy, reactions that are catalysed are also more sustainable, and therefore better for the environment.
2. By catalysing the conversion of ozone into oxygen, the ozone layer sees a reduction, also reducing the amount of protection from direct UV rays given to humans and other forms of life by the ozone layer.