About how long ago did oxygen begin to accumulate in earth’s atmosphere?
a.2 million
b.20 mil...
Chemistry, 16.04.2021 05:20 love123jones
About how long ago did oxygen begin to accumulate in earth’s atmosphere?
a.2 million
b.20 million
c.0.2 million
d.2 billion years
Answers: 1
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Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o sncl2•4h2o sncl2•6h2o
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Anurse used a 0.02-mg/l solution of disinfection to clean a patients wound. what is the concentration of the solution expressed as a percentage?
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