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netineya [11]
3 years ago
5

Which statement best describes perigee? A. The Sun's orbit that is closest to the Moon End of exam B. The closest point in Earth

's orbit of the Sun C. The farthest point in the Moon's orbit to Earth D. The closet point in the Moon's orbit to Earth
Chemistry
1 answer:
zhenek [66]3 years ago
6 0

Answer:

The closet point in the Moon's orbit to Earth

Explanation:

In the Moon's ellipticalorbit around Earth the closest

point of the orbit to the Earth is called the perigee, in the same light, point farthest in the Moon's orbit from Earth is known as apoge

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What was the ratio im the formula for the iron (ll) oxide
kkurt [141]

The Fe charge is 2+ and the O charge is 2- so the ratio is 1:1

FeO

4 0
3 years ago
What's ligand and how are they classified​
KATRIN_1 [288]

Explanation:

<u>Ligands:</u> In co-ordination chemistry ligands are ion, molecule or any species which donates electron pair to central metal atom.

Depending on the type of interaction Ligands are of three types.

  1. Sigma donor only
  2. sigma as well as pi donor
  3. pi acceptor ligand

let's understand each type of Ligands individually & in more detail.

1 - Sigma donor only: This is a unidirectional interaction, in which filled ligand overlaps (head to head) with central metal atom/ion & donates pair of electron in the LUMO of metal.

generally all the molecules of 2nd period without pi bond comes in this category, below are few example of sigma donor ligands,

\small \sf NH_3, H_2O, CH_3^-, H^-, R-OH, R-NH_3, etc

2- Pi donor: This in also a unidirectional interaction between ligand & central metal atom but the along with head to head overlap, side overlapping takes place.

generally protonated neutral molecules who have more than one pair to donate show such interaction, for e.g.

NH3 have two lone pair to donate but the energy level of both the lone pairs are different hence when it is neutral it only donates one pair of electron. but when NH3 is protonated to NH2- it have two electron pairs (negative charge+ lone pair) to donate & both the pairs have same energy level. example of such ligands are below,

\sf \small NH_2^-, OH^-, R-O^-, R-NH^-, F^-, Cl^-, Br^- SH^- etc

3- Pi acceptor ligand: This is a bidirectional interaction between ligand & central metal atom/ion, the filled orbital of ligand undergoes head to head to overlap with vacant orbital of central metal atom, & filled D orbital of central metal donates their pair to vacant LUMO of ligand.

depending on the LUMO pi acceptor ligands are further classified into two categories.

d\pi - \sigma*   \small \sf When  \: lumo \:  is  \: \sigma*\\ d\pi - \pi*   \small \: \sf When  \: lumo  \: is  \: \pi*

The dπ-σ* is seen in molecules of 3rd period onwards without pi bond <em>for e.g.</em>

<em>PH3,</em><em> </em><em>PR</em><em>3</em><em>,</em><em> </em><em>AsR</em><em>3</em><em> </em><em>&</em><em> </em><em>SR</em><em>2</em><em> </em><em>etc</em>

The dπ-π* is seen in molecules of 2nd or3rd period with pi bond <em>for e.g.</em>

CO C N- SC N^- etc

<em><u>Thanks for joining brainly community!</u></em>

8 0
2 years ago
How many hydrogen atoms would be present in 12 molecules of water (h2o)?<br>3<br>2<br>24<br>12​
GalinKa [24]

Answer:

Two water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.

Explanation:

4 0
3 years ago
which of the following has to remain constant to allow you to use the combine gas law for calculations?​
kap26 [50]

Answer:

The amount of gas is what I came up with

5 0
3 years ago
How many bonds does dichlorine hexptide
mixas84 [53]

Answer:

8 bond

Explanation:

The Dichlorine heptoxide molecule contains a total of 8 bond(s) There are 8 non-H bond(s), 6 multiple bond(s) and 6 double bond(s).

7 0
3 years ago
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