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antoniya [11.8K]
2 years ago
11

Hi there, giving brainliest to best answer. no spammers

Chemistry
2 answers:
Juli2301 [7.4K]2 years ago
4 0

Answer:

D. Earth's northern hemisphere is tilted toward the Sun

Explanation:

You can see in the picture above that the northern hemisphere is past the perpendicular to orbit line to the right.

Anna35 [415]2 years ago
4 0
I think it’s A but not sure
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Uranium-238 decays to lead-206 with a half-life of 4.5 x 109 yr. Determine how much uranium-238 decays in milligrams (to three s
Mamont248 [21]

Answer:

2.15 mg of uranium-238 decays

Explanation:

For decay of radioactive nuclide-

                        N=N_{0}.(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}

where N is amount of radioactive nuclide after t time, N_{0} is initial amount of radioactive nuclide and t_{\frac{1}{2}} is half life of radioactive nuclide

Here N_{0}=4.60 mg, t=4.1\times 10^{9}yr and t_{\frac{1}{2}}=4.5\times 10^{9}yr

So,N=(4.60mg)\times (\frac{1}{2})^{\frac{4.1\times 10^{9}}{4.5\times 10^{9}}}

so, N = 2.446 mg

mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg

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3 years ago
A hydrated salt, MgSO4, weighing 3.211 g is heated in a crucible until reaching a constant weight. The weight of the anhydrous M
Novay_Z [31]

Magnesium sulfate is an inorganic salt with the formula MgSO4(H2O)x where 0≤x≤7. It is often encountered as the heptahydrate sulfate mineral epsomite (MgSO4·7H2O), commonly called Epsom salt.

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Define the SI unit fro length, mass time , and temperature
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Length=The distance between two points

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7 0
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What is the mass of 5 moles of Fe2O?
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Explanation:

1 miole of Fe2O is 6.22 × 10^-23

5mole of Fe2O = 5×6.22×10^-23

=31.1×10^-23

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A compound is a substance made up of 2 or more _____.
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