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Norma-Jean [14]
3 years ago
8

Periodicity is best defined as:

Chemistry
2 answers:
Elis [28]3 years ago
7 0
The repeating nature of physical and chemical properties with increasing atomic number.
qwelly [4]3 years ago
6 0

Answer:the quality or character of being periodic; the tendency to recur at intervals.

"the periodicity of the sunspot cycle"

Explanation:

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The center of hemoglobin is made of which of the following?
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<span>The center of hemoglobin is made of which of the following?

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4 points<br> 9. Name the scientists that played a major role in the development of cell theory. *
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Hope this helps

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At 35.0°C and 3.00 atm pressure, a gas has a volume of 1.40 L. What pressure does the gas have at 0.00°C and a volume of 0.950 L
Luba_88 [7]

The answer to your question is

A. P2=P1V1T2/T1V2

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THE RIGHT ANSWER WILL RECIEVE A BRAINLEST AND POINTS!!!
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3 0
3 years ago
An iron ore sample weighing 0.5562 g is dissolved HCl (aq), and the iron is obtained as Fe2 in solution. This solution is then t
erik [133]

Answer:

\% Fe^{+2}=70%

Explanation:

Hello,

In this case, we could considering this as a redox titration:

Fe^{+2}+(Cr_2O_7)^{-2}\rightarrow Fe^{+3}+Cr^{+3}

Thus, the balance turns out (by adding both hydrogen ions and water):

Fe^{+2}\rightarrow Fe^{+3}+1e^-\\(Cr_2^{+6}O_7)^{-2}+14H^++6e^-\rightarrow 2Cr^{+3}+7H_2O\\\\6Fe^{+2}+(Cr_2^{+6}O_7)^{-2}+14H^++6e^-\rightarrow Cr^{+3}+7H_2O+6Fe^{+3}+6e^-

Thus, by stoichiometry, the grams of Fe+2 ions result:

m_{Fe^{+2}}=0.04021\frac{molK_2Cr_2O_7}{L}*0.02872L*\frac{6molFe^{+2}}{1molK_2Cr_2O_7}*\frac{56gFe^{+2}}{1molFe^{+2}}=0.388gFe^{+2}

Finally, the mass percent is:

\% Fe^{+2}=\frac{0.388g}{0.5562g}*100\%\\  \% Fe^{+2}=70%

Best regards.

8 0
3 years ago
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