What conditions on Earth allow life to thrive?

Chemistry

2 answers:

olga_2 [115]3 years ago

8 0

Answer:

atmosphere containing free oxygen --> atmosphere shielding against UV --> ozone layer in upper atmosphere --> axis of rotation generally perpendicular to orbital plane --> magnetic field that deflects the solar wind --> liquid water --> temperature near the triple point of water --> range of temperature sufficiently narrow, over appreciable portion of the planet's surface, conducive to the chemistry of life

satela [25.4K]3 years ago

7 0

Ugghhhhhhhhhhhhhhhhhhhhhhhhhh

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Determine a massa de um átomo de carbono12 em gramas

lapo4ka [179]

I believe it would be 1.660539040 × 10−24 gram.

3 0

3 years ago

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Lead(II) nitrate is added slowly to a solution that is 0.0800 M in Cl− ions. Calculate the concentration of Pb2+ ions (in mol /

barxatty [35]

Answer:

$[Pb^{2+}]=3.9 \times 10^{-2}M$

this is the concentration required to initiate precipitation

Explanation:

$PbCl_2$ ⇄ $Pb^{2+}+2Cl^-$

Precipitation starts when ionic product is greater than solubility product.

Ip>Ksp

Precipitation starts only when solution is supersaturated because solution become supersaturated then it does not stay in this form and precipitation starts itself only solution become saturated.

This usually happens when two solutions containing separate sources of cation and anion are mixed together and here also we are mixing lead (||)nitrate solution(source of lead(||)) into the Cl- solution.

$Ip=[Pb^{2}][2Cl^-]^2=Ksp$