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Tcecarenko [31]
3 years ago
7

7. *

Chemistry
1 answer:
umka2103 [35]3 years ago
3 0

Answer:

b bowel infections

Explanation:

I think

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1. With the aid of a Hess cycle, determine the enthalpy of the decomposition reaction of sodium nitrate, NaNO3 to sodium nitrite
lakkis [162]

Answer:

Explanation:

2NaNO₃ = 2NaNO₂ + O₂

NaNO₃    =     NaNO₂   +    1/2 O₂

- 468 kJ           -369 kJ           0  kJ

enthalpy of decomposition reaction

= - 369 - ( - 468 ) kJ

= 99 kJ / mol .      

5 0
4 years ago
Element 2 is:<br> A) Cobalt<br> B)Chlorine <br> C)Calcium<br> D)Carbon
saul85 [17]

Answer:

D: Carbon

Explanation:

Carbon is the sixth element with a total of 6 electrons in the periodic table. Hence the atomic number Z = 6. The ground state electron configuration of carbon is 1s2 2s2 2p2. An excited state electron configuration of carbon is 1s2 2s1 2p3.

4 0
3 years ago
Which series of labels correctly identifies the indicated structures in this sketch of a cell viewed under a microscope? A.mitoc
kifflom [539]

Answer:

for the first it is B i do not know for the second

Explanation:

i took the quiz hope this helped

4 0
4 years ago
Read 2 more answers
If you want 1,775 mL of 48 M MgCl2 solution, how many grams of MgCl2 do you need?
vlada-n [284]

Answer:

0.1

Explanation:

3 0
3 years ago
Explain why some nuclei cannot experience magnetic resonance and give two examples. ​
zhenek [66]

Answer:

Any nucleus that has an overall spin quantum number of zero (I=0) is NMR inactive

Explanation:

A wide range of nuclei are found to be NMR active. NMR is the acronym for nuclear magnetic resonance. It is a powerful spectroscopic tool which uses radio waves. The nuclear spin is described by the nuclear quantum number I and can take on values of; 0,1/2, 1, 3/2,2,5/2 etc.

Any nucleus that has an overall spin quantum number of zero (I=0) is NMR inactive e.g Carbon-12 and Oxygen-16 nuclei.

Commonly, all NMR active nuclei posses I ≥ 1/2, Hydrogen -1 , Carbon-13 and boron-11 are common examples of NMR active nuclei.

5 0
3 years ago
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