MSU CEM 141 Final Exam Prep Newest Actual Exam
With Complete Questions And Correct Detailed
Answers (Verified Answers) |Already Graded A+|Brand
New!!
do noble gases have high or low melting/boiling points? -
ANSWER-very low
why do noble gases exist as single atoms? - ANSWER-
because they have stable electron arrangements.
noble gases - ANSWER-The elements in group 18, on the
right of the modern periodic table, are called the noble
gases.
,Why are they called the 'Noble Gases'? - ANSWER-▪They
are all very unreactive.
▪ Noble gases were originally called 'inert gases', as they
were thought not to react with anything. Then a British
chemist, Neil Bartlett, made a compound with xenon.
▪ The name was changed to 'noble gases' as they were
considered like the very unreactive precious metals gold
and platinum, which are sometimes called 'noble' metals.
What is the second most abundant element in the
universe? - ANSWER-Helium
What contains helium? - ANSWER-▪Crude natural gas
often contains helium. Commercially available helium is
, obtained via its separation from these gaseous mixtures
by fractional distillation.
▪The other noble gases, apart from radon, are present in
small amounts in air and are commonly obtained by
fractional distillation of liquid air.
Uses of the noble gases - ANSWER-▪He-inert atmosphere
▪Helium-deep-sea diving.
▪Liquid helium (with a boiling point of 4.2 K)-coolant for
superconducting magnets in NMR and MRI instruments.
▪heliox
▪Argon-inert atmosphere.
▪The noble gases emit light of vivid colors when an
electrical discharge is passed through them; the color
With Complete Questions And Correct Detailed
Answers (Verified Answers) |Already Graded A+|Brand
New!!
do noble gases have high or low melting/boiling points? -
ANSWER-very low
why do noble gases exist as single atoms? - ANSWER-
because they have stable electron arrangements.
noble gases - ANSWER-The elements in group 18, on the
right of the modern periodic table, are called the noble
gases.
,Why are they called the 'Noble Gases'? - ANSWER-▪They
are all very unreactive.
▪ Noble gases were originally called 'inert gases', as they
were thought not to react with anything. Then a British
chemist, Neil Bartlett, made a compound with xenon.
▪ The name was changed to 'noble gases' as they were
considered like the very unreactive precious metals gold
and platinum, which are sometimes called 'noble' metals.
What is the second most abundant element in the
universe? - ANSWER-Helium
What contains helium? - ANSWER-▪Crude natural gas
often contains helium. Commercially available helium is
, obtained via its separation from these gaseous mixtures
by fractional distillation.
▪The other noble gases, apart from radon, are present in
small amounts in air and are commonly obtained by
fractional distillation of liquid air.
Uses of the noble gases - ANSWER-▪He-inert atmosphere
▪Helium-deep-sea diving.
▪Liquid helium (with a boiling point of 4.2 K)-coolant for
superconducting magnets in NMR and MRI instruments.
▪heliox
▪Argon-inert atmosphere.
▪The noble gases emit light of vivid colors when an
electrical discharge is passed through them; the color
