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vlada-n [284]
3 years ago
6

Which ion was formed by providing the second ionization energy to remove an electron?

Chemistry
1 answer:
DerKrebs [107]3 years ago
6 0
If we remove 2 electrons, the new charge will be positive by 2 units. Hence, the ion is Ca^{2+}.
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Which of the following sets represents a pair of isotopes? 14C and 14N 206Pb and 208Pb O2 and O3 32S and 32S2-
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Isotopes are substances that have the same number of protons but differ in the number of neutrons. Hence, the pair of isotopes above should be of the same element. In the given choices, 14C is not an isotope of 14N. 206Pb is an isotope of 208 Pb. O2 and O3 differ in molecular formula but still made up of same kind of atom, hence they are allotropes, while 32S and 32S2- are not isotopes.  
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3 years ago
What is calorimetry​
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sweet [91]

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4 0
3 years ago
A fossilized leaf contains 24% of its normal amount of carbon 14. how old is the fossil (to the nearest year)? use 5600 years as
sergij07 [2.7K]
The Half life is the time taken for a radioisotope or a radioactive substance to decay by half its original amount. The half life of carbon 14 is 5600 years. 
Original mass is 100%
Remaining amount is 24% 
Therefore; 0.24 = 1 × (1/2)^n
                     n = log 0.24/log 0.5
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therefore, the age of the fossil is 5600×2.06
 = 11529.8 
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7 0
4 years ago
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