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Whitepunk [10]
3 years ago
10

how does a spectral signature help scientists determine the composition of planets and other stars???

Chemistry
1 answer:
sveticcg [70]3 years ago
6 0

Answer:

How do scientists determine the chemical compositions of the planets and stars? Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object's spectrum, they can determine its composition based on these wavelengths. ... That fingerprint often appears as the absorption of light.

Explanation:

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How do you do problem #15?
SVETLANKA909090 [29]
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7 0
3 years ago
For alkyl halides used in SN1 and SN2 mechanisms, rank the leaving groups in order of reaction rate. You are currently in a rank
Alex777 [14]

Answer:

Iodide> Bromide > chloride > flouride

Explanation:

During a nucleophilic substitution reaction, a nucleophilie replaces another in a molecule.

This process may occur via an ionic mechanism (SN1) or via a concerted mechanism (SN2).

In either case, the ease of departure of the leaving group is determined by the nature of the C-X bond. The stronger the C-X bond, the worse the leaving group will be in nucleophilic substitution. The order of strength of C-X bond is F>Cl>Br>I.

Hence, iodine displays the weakest C-X bond strength and it is thus, a very good leaving group in nucleophillic substitution while fluorine displays a very high C-X bond strength hence it is a bad leaving group in nucleophilic substitution.

Therefore, the ease of the use of halide ions as leaving groups follows the trend; Iodide> Bromide > chloride > flouride

4 0
2 years ago
Assume a density of water of 1.00 g/mL, and calculate the mass of water in the solution
tiny-mole [99]

Answer:

1g or 10^-3kg

Explanation:

as you know , the density =mass \volume

so  you have the mass from the number it self

<h2>\frac{1g}{1 ml} so from this equation, you will get 1 g and you can to SI to be 10^{-3}kg</h2>
5 0
3 years ago
How many electrons are in Fe3+ ?
Annette [7]

Answer:

There are 23 electrons in Fe3+

4 0
3 years ago
Read 2 more answers
What is the first step to determine the sequence of filling electron configurations of an element?
faust18 [17]
Basically, the arrangement of electrons in electronic configuration follows three principles:

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2. Hund's Rule
Each box in the configuration can hold up to 2 electrons. This rule tells you to fill all boxes of one particular subshell with 1 electron first, before double occupying them.

3. Pauli's Exclusion Principle
This rule tells you that the two electrons in a box shall always have opposite spins, represented by one half-arrow up and one half-arrow down.</span>
6 0
3 years ago
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