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Whitepunk [10]
3 years ago
10

Based on the information above, do you think that fluorine has common isotopes? Justify your answer.

Chemistry
2 answers:
Simora [160]3 years ago
5 0

Answer is: fluorine does not have common isotopes, because its average atomic mass is 19.

Fluorine has only one isotope occurs naturally in abundance, the stable isotope F-19.

This isotope has:

1) n(p⁺) = 9; fluorine has atomic number Z = 9 (total number of protons).

2) n(e⁻) = 9; in an element, number of electrons and protons are the same.

3) n(n°) = 10; mass number of this isotope is A = 19. Mass nummber is total number of protons and neutrons in a nucleus, so number of neutrons is:  

n(n°) = A-Z.

n(n°) = 19-9.

n(n°) =10.

andre [41]3 years ago
4 0

Answer:

No, it hasn't. Because it has 9 protons and 10 neutrons and its average mass is 19, it has no common isotopes.

Explanation:

An isotope is an atom of the element which has the same atomic number (number of protons), but a different mass number. For example, hydrogen has 3 isotopes: H¹, H², and H³, all with an atomic number equal to 1.

The mass that is represented in the periodic table is the weighted average of the masses of the isotopes, based on the percentage that they're found in nature.

The mass of an atom is concentrated in the nucleus, so it is the mass of the protons plus the mass of the neutrons, which are equal to 1 amu (atomic mass unity).

For the fluorine atom with mass 19.00 and atomic number 9, we can infer it has 10 neutrons. Because the average mass is exactly 19.00 we can infer that all the fluorine atoms have 9 protons and 10 neutrons ( it's easy to observe in the periodic table that the masses are not exactly).

Then, we can infer for the information that fluorine has no common isotopes.

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3 years ago
Acetic acid and ethanol react to form ethyl acetate and water, like this:
ladessa [460]

Answer:

1.) Option C is correct.

The rate of reverse reaction is greater than zero, but equal to the rate of the forward reaction.

2) Option B is correct.

The rate of reverse reaction is Greater than zero, but less than the rate of the forward reaction.

3) Option C is correct.

The rate of reverse reaction is Greater than zero, and equal to the rate of the forward reaction.

4) Option A is correct.

How much less C2H5CO2CH3 is in the flask when the system has again reached equilibrium? Zero.

Explanation:

HCH,CO2(aq) + C2H5OH(aq) ⇌ C2H,CO2CH3(aq) + H2O

1) Before the main product is removed from the reaction setup, the chemical reaction is at equilibrium.

Chemical equilibrium is a state of dynamic equilibrium such that the concentration of the reactants and the products do not always remain the same but the rate of forward reaction always matches the rate of backward reaction.

2) When 246. mmol of C2HCO2CH3 are removed from the reaction mixture....

And when one of the factors involved in chemical equilibrium changes, Le Chatellier's principle explains that the system then adjusts to remedy this change and takes time to go back to equilibrium again.

When one of the species involved in the chemical reaction at equilibrium, is removed from the reaction mixture, the rate of reaction begins to favour that side of the reaction until equilibrium is re-established.

So, when 246 mmol of one of the products is removed, the response is to cause the rate of forward reaction to be favoured to produce more of products as there are fewer, and the rate of reverse reaction at this moment becomes less than the rate of forward reaction.

3) The rate of the reverse reaction when the system has again reached equilibrium

Like I said in (2) above, the reaction remedies this change in concentration of one of the products until equilibrium is re-established and when chemical equilibrium is re-established the rate of forward reaction once again matches the rate of backward reaction.

4) How much less C2H5CO2CH3 is in the flask when the system has again reached equilibrium?

By the time equilibrium is re-established, the system goes back to how it all was and the concentration of C2H5CO2CH3 goes back to the same as it was at the start of the reaction.

Hope this Helps!!!

3 0
2 years ago
What is the affect of neutrons on atoms
Evgen [1.6K]

Answer:

It's better to explain it.

Explanation:

Neutrons do not affect the electron configuration, but the sum of atomic number and the number of neutrons, or neutron number, is the mass of the nucleus. You know that neutrons are found in the nucleus of an atom. Under normal conditions, protons and neutrons stick together in the nucleus. During radioactive decay, they may be knocked out of there. Neutron numbers are able to change the mass of atoms, because they weigh about as much as a proton and electron together. if your asking What is the role of a neutron in an atom? then, Neutrons are very important in providing stability for an atom. Some atoms don't "need" neutrons - The hydrogen atom does not have any neutrons. However, as the atomic number ( # of protons ) increases, the number of neutrons increases as well.

Protons don't like each other. Naturally, 'positive charges repel', so it wouldn't be possible to have more than one proton in the nucleus. Here's where the neutron comes in.

Hope this helps. :)

7 0
3 years ago
Which combination(s) of alkyl bromide and carbonyl compound can be used to prepare the following product by reaction of the Grig
Fiesta28 [93]

Answer:

D. only 2 and 3

Explanation:

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7 0
3 years ago
PLEASE HELP!
KatRina [158]
Hello the answer is c love
7 0
2 years ago
Read 2 more answers
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