The reaction is a decomposition…
… because one substance is forming two other substances.
It is also a <em>reduction-oxidation reaction</em> because the <em>oxidation number of N decreases</em> from +5 to +3 and the <em>oxidation number of O increases</em> from -2 to 0.
The correct answer is A. It shows how electrons are distributed in the shells of an iron atom.
Explanation:
In the model described, the circles represent the orbitals or shells of the atom, while the dots represent the distribution of electrons (negatively charged sub-particles). Additionally, the description shows the general electronic configuration of this atom is 2, 8, 14, 2, which means in the first orbital there are two electrons, in the second there are eight electrons, in the third, there are fourteenth electrons and in the fifth orbital there are two electrons. This electronic configuration occurs in the atoms of iron. Also, this differs from Cobalt because in cobalt the third orbital has 15 electrons. Thus, the model "shows how electrons are distributed in the shells of an iron atom".
Answer: 7.226 x 10^22 oxygen atoms
EXPLANATION :
we know that 1 mole of anything is 6.022 x 10^23 of that thing.
The formula of Quartz is SiO2. So, 1 mole of Quartz will have 2 moles of oxygen atoms, i.e. 2 x 6.022 x 10^23 atoms of oxygen.
The molar mass of quartz is 60 g per mol. So, 60 g quartz means 1 mole quartz. We are given 3.6 g quartz,
60 g quartz means 1 mole quartz or 2 x 6.022 x 10^23 oxygen atoms.
then 3.6 g quartz will have oxygen atoms equal to (2 x 6.022 x 10^23 x3.6) / 60 = 0.7226 x 10^23 oxygen atoms or 7.226 x 10^22 oxygen atoms.
Answer:
- Option A): <em>Due to the constraints upton the angular momentum quantum number, the subshell </em><u><em>2d</em></u><em> does not exist.</em>
Explanation:
The <em>angular momentum quantum number</em>, identified with the letter l (lowercase L), number is the second quantum number.
This number identifies the shape of the orbital or <em>kind of subshell</em>.
The possible values of the angular momentum quantum number, l, are constrained by the value of the principal quantum number n: l can take values from 0 to n - 1.
So, you can use this guide:
Principal quantum Angular momentum Shape of the orbital
number, n quantum number, l
1 0 s
2 0, 1 s, p
3 0, 1, 2 s, p, d
Hence,
- <u>the subshell 2d (n = 2, l = 2) is not feasible</u>.
- 2s (option B) is possible: n = 2, l = 0
- 2p (option C) is possible: n = 2, l = 1
i) 2KClO3 → 2KCL + 3O2
ii) HNO3 + NaHCO3 → H20 + CO2
iii) 2Na + 2H2O → 2NaOH + H2