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3 years ago

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?

sveticcg [70]

The center of hemoglobin is made of which of the following?

amino acids

5 0

3 years ago

4 points 9. Name the scientists that played a major role in the development of cell theory. *

jeyben [28]

The answer would be Theodore Schwann, Matthias Jakob Schleiden and Rudolf Virchow(he contributed but is not credited)

Hope this helps

Have a great day/night

5 0

3 years ago

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

Trust me I am learning this stuff in class and I got everything memorized

I hope this helps

May I have brainliest I am working on my ranks! :)

7 0

3 years ago

Read 2 more answers

THE RIGHT ANSWER WILL RECIEVE A BRAINLEST AND POINTS!!!

Vika [28.1K]

If you drop a bath bomb into water then it will start to fizz. It will fizz because there is a chemical reaction from the different ingredients taking place meaning that these ingredients react to water.

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