2 Fill in the blanks.
a. Meteors burn and appear as shooting
stars in the
(thermosphere/mesosphere).
(Carbon dioxide/Nitrogen) is the most abundant gas
present in the atmosphere.
c. Nitrogen(supports/does not support)combustion of fuels.
(Argon/Radon) is used
in the treatment of cancer.
e. Burning of fossil fuels releases
(nitrogen/carbon
dioxide) into the atmosphere.
f. Rusting of iron objects makes them
(strong/brittle).
Answers
Answer: Given below.
Explanation:
A) Mesosphere Layer
-> Many people call them shooting stars and they burn and appear in the Mesosphere layer of the atmosphere.
B) Nitrogen
-> The most abundant naturally occurring gas is nitrogen (N2), which makes up about 78% of air.
C) They don't support it.
-> Nitrogen gas is not highly reactive. So, they do not support combustion with other molecules in the atmosphere and are mainly present in the air as N2 (78%). Unreactive behavior results from the powerful bonds that form between the three pairs of electrons shared between two nitrogen atoms.
D) Radon
-> It is a radioactive, odorless, and tasteless noble gas. It is represented by Rn.
E) Carbon
-> They release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, causing global warming.
F) Brittle
-> They weaken the metal, making the structure brittle and crumbly.