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3 years ago

Why do electrons gain energy?

2 answers:

8 0

Electrons can gain the energy it needs by absorbing light. If the electron jumps from the second energy level down to the first energy level, it must give off some energy by emitting light. The atom absorbs or emits light in discrete packets called photons, and each photon has a definite energy.

adoni [48]3 years ago

6 0

☁️My Answer☁️:

Atomic electrons lose / gain energy when transferring from one orbital to another and hence emitting / absorbing a photon. Free electrons (by which I mean electrons that are not part of an atom) lose or gain energy by scattering inelastic ally with atoms or molecules. In this case, energy is transferred to / from the atom or molecule from / to the electron in the form of kinetic energy

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Iron has many isotopes but only 4 are found in significant amounts in naturally found mixtures. The amounts by mass percent are:

AnnZ [28]

Answer:

The average mass of iron to be is 54.76 amu.

Explanation:

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$

Mass of Fe-54 isotope = 53.9396 amu

Percentage abundance of Fe-54 = 5.845%

Fractional abundance of Fe-54 = 0.05845

Mass of Fe-56 isotope = 55.9349 amu

Percentage abundance of Fe-56 = 91.754 %

Fractional abundance of Fe-56= 0.91754

Mass of Fe-57 isotope = 56.9354 amu

Percentage abundance of Fe-57 = 2.119%

Fractional abundance of Fe-57 = 0.002119

Mass of Fe-58 isotope = 57.9333 amu

Percentage abundance of Fe-58 = 0.282%

Fractional abundance of Fe-58 = 0.00282

Average atomic mass of iron :

$=53.9396 amu\times 0.05845+55.9349 amu\times 0.91754 +56.9354 amu\times 0.002119 + 57.9333 amu\times 0.00282=54.76 amu$

The average mass of iron to be is 54.76 amu.

5 0

3 years ago

Which of the following is the smallest volume? 500 mL 2,500 cm3 5.5 x 10-1 L 25 m3

Anni [7]

500 ml is the answer

6 0

4 years ago

How many grams of NaOH is needed to neutralize 90 mL of 1.5 N HCl?

AnnZ [28]

mol = conc × v

= 1.5 × 0.09

= 0.135 moles of HCl

HCl + NaOH > NaCl + H2O

1 mole HCl = 1 mole NaOH

0.135 mol HCl = x

x = 0.135 mol NaOH

mass = mol × molar mass

= 0.135 × 40

= 5.4 g

NaOH = 23 + 16 + 1 = 40 g/mol

I'm not a 100% sure if it's correct

6 0

3 years ago

What type of bond does hafnium oxide have? A. ionic B. covalent C. Metallic

Dima020 [189]

Answer:

C) METALLIC IS THE CORRECT ANSWER

Explanation: I just did the exam

6 0

3 years ago

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ________

LiRa [457]

The given question is incomplete. The complete question is :

What is the coefficient of $H_2O$ when the following equation is properly balanced with the smallest set of whole numbers? $PCl_3(l)+H_2O(l)\rightarrow H_3PO_3(aq)+HCl(aq)$

Answer: The coefficient of $H_2O$ is 3

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reaction is:

$PCl_3(l)+3H_2O(l)\rightarrow H_3PO_3(aq)+3HCl(aq)$

The coefficient of $H_2O$ is 3

7 0

3 years ago