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why d-block elements elements are called as outer transition elements and f-block elements as inner transition elements?
The d-block elements are called transition metals and have valence electrons in d orbitals. The inner transition elements are those who have their last 3 shells incompletely filled. The f...
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Which noble
gas was discovered extra
-
terrest
rially before its discovery on
Earth?
What were the reasons fo
r late discovery of noble gases
?
Helium was first discovered not on Earth, but in the Sun. In 1868 French astronomer Pierre Janssen studied light from the Sun during a solar eclipse. He found proof that...
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Why were the compounds
of noble gases discovered late
? Why do noble gases
form
compounds
only
with oxygen and fluorine
?
1. Noble gases were discovered later than other elements, because they were extremely un-reactive. Being inert, they were difficult to isolate via chemical reactions, thus difficult to distinguish as separate...
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Why were the compounds of noble gases discovered late? Why do noble gases
form compounds only with oxygen and fluorine?
noble gases (He, Ne, Ar, Kr, Xe, Rn) are the elements with the fully filled outer shell of valence electrons, so that under normal conditions their atoms do not need...
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Group 8 elements are referred to as noble gasses. [5]
(a) If any, which of the noble gas(es) react with fluorine? Why?
(b) Give a balanced reaction equation of any of the possible reactions in (a).
Xenon because it is more electronegative in the group due to the large size.Xe + 2F 2 --->XeF4
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Analyse the symmetry elements possessed by carbonate and hydronium ions. List the symmetry elements that both ions have in common.
A symmetry operation is an action that leaves an object looking the same after it has been carried out. For example, if we take a molecule of water and rotate...
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The pollutant gas CO is also found in the exhaust gases from petrol engines. Explain how CO and NO are removed from the exhaust gases and why the removal of each of them is desirable.
You can remove NO by O2 and H2O 2NO+O2---gt;2NO2 2H2O+4NO2+O2---gt;4HNO3 You can remove by NO NO+CO---gt;N2 + CO2
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A mixture of four gases exerts a total pressure of 860mmHg. Gas A and B each exert 220mmHg. Gas C exerts 110mmHg. What pressure is exerted by gas D?
For this task we use the Dalton’s law which says that total pressure of mixture of gases equals to the sum of partial pressures of individual gases: Ptotal=PA+PB+PC+PD Therefore PD...
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List 4 examples of noble gases and their uses
The examples of noble gases: helium, neon, xenon, argon.Helium is used in airships and rockets as a lifting gas, fuel, and coolant, in gas chromatography as a gas-carrier.Neon is used...
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Determine the partial pressures of ideal gases A, B, and C in a container with a total pressure of 3.5 atm. The number of moles for Gas A is twice that of Gas B and four times that of Gas C.
A = 2x , B = x , C = 0.5x A+B+C = 3.5atm2x+x+0.5x = 3.5atm3.5x = 3.5atmx = 1 atmA = 2x = 2×1 = 2atmB = x =...
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