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Kobotan [32]
2 years ago
9

Help

Chemistry
1 answer:
Burka [1]2 years ago
4 0
The Moon<span> moves </span>around<span> the </span>Earth in<span> an </span>approximately<span> circular </span>orbit<span>, going once </span>around<span>  </span>in approximately<span> 27.3 </span><span>days.  </span>The moon orbits quite fast: it moves about 0.5 degrees<span> per hour in the sky. So, its average movement in a day is around 13 degrees.   5 days x 13 degrees is approximately 65 degrees. </span>
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How many formula units are in 9.8 grams of calcium hydroxide?
Neporo4naja [7]

Answer:

There are 9.8 ×1021. formula units in 10,005.8gCaO 

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2 years ago
Answer the question briefly: How can atom collapse and why are atoms stable?
kykrilka [37]

The nuclei of atoms become unstable when the repelling forces of the protons cannot be balanced by the number of neutrons in the nucleus. It then re-arranges itself randomly to a more stable configuration by emitting any of a series of particles. During radioactive decay, an atom does not collapse.

Since an atom is mostly empty space - that is it’s nucleus is relatively distant from the electron shells so, in the presence of extreme forces such as gravity inthe collapse of a large star, the inward pressures on the atom overcome the natural balance of the atomic structure and the ‘empty space’ disappears as nuclei are mashed together by the intense pressures and a neutron star is formed. Under even more external pressure, even the neutron star can collapse to form a black hole.

8 0
3 years ago
The ground state of an electron is the least stable energy state of an atom
kari74 [83]

Answer:

electron configuration

Explanation:

The arrangement of electrons in the atomic orbitals of an atom is called the electron configuration. Electron configurations can be determined using a periodic table.

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3 years ago
Which one of these are correct base pairs in DNA?
Arisa [49]
Base pairs of DNA are A with T, and C with G

here's how to remember:

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8 0
3 years ago
Which element is reduced in the following reaction: 2Mg+O₂ → 2MgO if Mg goes from 0 to +2 and O goes from 0 to -2?
Lyrx [107]

Answer:

O.

Explanation:

  • The element which is oxidized is the element that losses electrons and its oxidation state be more positive.
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<em> O goes from 0 to -2, so, it is the element that is reduced.</em>

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