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Author Question: Which pair of elements below should be the most similar in chemical properties? A) C and O B) B ... (Read 112 times)

melina_rosy

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on: Aug 27, 2018
Which pair of elements below should be the most similar in chemical properties?
 
  A) C and O
  B) B and As
  C) I and Br
  D) K and Kr
  E) Cs and He

Question 2

Acetylcholine is a chemical messenger that
 
  A) activates the presynaptic membrane to make it permeable to ions that conduct an impulse.
  B) inactivates the presynaptic membrane to make it impermeable to certain ions that conduct an impulse.
  C) activates the postsynaptic nerve cell by fitting into a specific receptor and changing the permeability of the cell membrane to certain ions.
  D) inactivates the postsynaptic membrane to make it impermeable to certain ions that conduct an impulse.
Chemistry: The Central Science ¦ Brown, LeMay, Bursten ¦ 14th Edition
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isabelt_18

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Reply #1 on: Aug 27, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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melina_rosy

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Reply 2 on: Aug 27, 2018
Gracias!

adf223

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Reply 3 on: Yesterday
Wow, this really help

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