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Veronika [31]
3 years ago
12

Consider an atom that has an electron in an excited state. The electron falls to a lower energy level. What effect does that hav

e on the electron?
A. The electron releases energy in the form of light.

B. The electron absorbs energy in the form of light.

C. The electron retains its energy without any change.

D. The electron transfers its energy to other electrons.
Chemistry
1 answer:
ANTONII [103]3 years ago
8 0
Did you happen to find the answer yet? I've tried to find it, but I haven't succeeded yet
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Read 2 more answers
Calculate the number of chlorine atoms that are present in 66.05 g of dichloromethane, ch2cl2. when you have the number, take it
Whitepunk [10]
From the periodic table:
mass of carbon = 12 grams
mass of hydrogen = 1 gram
mass of chlorine = 35.5 grams
Therefore,
molar mass of CH2Cl2 = 12 + 2(1) + 2(35.5) = 85 grams

number of moles = mass / molar mass
number of moles of CH2Cl2 = 66.05 / 85 = 0.777 moles

One mole of CH2Cl2 contains two moles of Cl and each chlorine mole has Avogadro's number of atoms in it.
Therefore,
number of chlorine atoms in 0.777 moles of CH2Cl2 can be calculated as follows:
number of atoms = 0.777 * 2 * 6.022 * 10^23 = 9.358 * 10^23 atoms

Now, we will take log base 10 for this number:
log (9.358 * 10^23) = 23.97119
5 0
2 years ago
At a certain temperature this reaction follows first-order kinetics with a rate constant of 2.01 s^−1
ddd [48]

Answer:

0.80 seconds (2 significant figures)

Explanation:

The equation of the reaction is given as;

CICH2CH2Cl (g) --> CH2CHCI (g) + HCl(g)

Rate constant (k) = 2.01 s^-1

From the units of the rate constant, this is a first order reaction.

Initial Concentration = 1.34 M

t = ?

Final concentration = 20% of 1.34 = 0.268 M

The integrated rate law for a first order reaction is given as;

ln[A] = ln[A]o - kt

ln(0.268) = ln(1.34) - 2.01(t)

-2.01(t) = - 1.6094

t = 0.8007 ≈ 0.80 seconds (2 significant figures)

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2 years ago
Earths mantle is made of a dense thick material that allows movement of crystal plates. Crust plate movement occurs because the
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Answer:

Convection cells

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2 years ago
A certain solid substance, that is very hard, has a high melting point and is nonconducting unless melted is most likely to be:A
svetlana [45]

Answer: B) KCl

Explanation:

It is an odourless gas with a melting point of of 770°c and a boiling point of about 1420°c, it exists in a white crystalline solid form. KCl is highly water soluble and also soluble in other variety of polar solvent but insoluble in many organic solvents.

7 0
3 years ago
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