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Julli [10]
3 years ago
7

Certain "rules" of chemistry are used to simplify concepts when in fact sometimes these rules are often "broken." Place the prop

er word into each sentence illustrating some of these exceptions.

Chemistry
1 answer:
True [87]3 years ago
4 0

Answer:

The question is incomplete but this is the complete question in picture format.

Explanation:

1. An ION is the violation of the rule that suggests that electron and proton will be equal in number for each atom.

2. An ISOTOPE violates the rule that number of neutrons always equals the number of protons.

3. The original term ELEMENT meant to be indivisible, a term that doesn't consider the modern understanding of atom splitting and radioactive decay.

4. Often depicted with a central nucleus with concentric rings housing electrons, the ORBITAL models incorrectly conveys the idea that electrons rotate around the nucleus in a predictable orderly fashion.

5. The large number of naturally existing isotopes violate the rule that adding the number of neutrons and protons will yield and accurate ATOMIC weight.

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B. if 6.73 g of na2co3 is dissolved in enough water to make 250. ml of solution, what is the molar concentration of sodium carbo
BARSIC [14]

Answer:- [Na_2CO_3]=0.254M , [Na^+]=0.508 M , [CO_3^2^-]=0.254M

Solution:- We are asked to calculate the molarity of sodium carbonate solution as well as the sodium and carbonate ions.

Molarity is moles of solute per liter of solution. We have been given with 6.73 grams of sodium carbonate and the volume of solution is 250.mL.  Grams are converted to moles and mL are converted to L and finally the moles are divided by liters to get the molarity of sodium carbonate.

Molar mass of sodium carbonate is 105.99 gram per mol. The calculations for the molarity of sodium carbonate are shown below:

\frac{6.73gNa_2CO_3}{250.mL}(\frac{1mol}{105.99g})(\frac{1000mL}{1L})

= 0.254MNa_2CO_3

So, molarity of sodium carbonate solution is 0.254 M.

sodium carbonate dissociate to give the ions as:

Na_2CO_3(aq)\rightarrow 2Na^+(aq)+CO_3^2^-

There is 1:2 mol ratio between sodium carbonate and sodium ion. So, the molarity of sodium ion will be two times of sodium carbonate molarity.

[Na^+]=2(0.254M) = 0.508 M

There is 1:1 mol ratio between sodium carbonate and carbonate ion. So, the molarity of carbonate ion will be equal to the molarity of sodium carbonate.

[CO_3^2^-]=0.254M


5 0
3 years ago
What is the generic name of the drug <br> Ritalin
Vesnalui [34]

Answer:

Methylphenidate Hcl

Explanation:

pretty sure

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What is the mass of 4 × 1015 atoms of nickel<br> (Ni)?<br> Answer in units of g.
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Answer:

4060

Explanation:

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:It means that as they are removed the predators go hungry and they could become extinct.

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An explanation of what will happen every time in a specific situation
kramer
The one that is being described above is what we call SCIENTIFIC LAW. Scientific law is what explains of what will happen every time in a certain situation. This is also different from scientific theory since scientific theory only gives an explanation to a group of happenings and this can still be modified. Hope this helps.
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