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ss7ja [257]
2 years ago
12

Which statement is true of chloroplasts?

Chemistry
1 answer:
Anastasy [175]2 years ago
5 0

d answer is correct that help

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An atom was observed with +3 charge, n = 38, and e = 28. What is the mass number of the atom?
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She will most likely observe that the temperature does not change during melting because the heat absorbed is used to overcome intermolecular forces rather than to increase the kinetic energy of the particles if she measures the temperature of the water in the beaker.

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The ionization energy (Ei) is the minimum amount of energy required to remove the valence electron, when element lose electrons, oxidation number of element grows (oxidation process).  

Alkaline metals (group 1), in this example rubidium, have lowest ionizations energy and easy remove valence electrons (one electron), they are most reactive metals.

Earth alkaline metals (group 2), in this example strontium, have higher ionization energy than alkaline metals, because they have two valence electrons, they are less reactive.  

Rubidium electron configuration: ₃₇Rb 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s¹; one valence electron is 5s¹ orbital.

Strontium electron configuration: ₃₈Sr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²; two valence electrons is 5s² orbital.

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When was the last time that humans have left Earths orbit?
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A simile is a comparison using "as" or "like" and a metaphor is a comparison without using "like" or "as"
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