Energy is released as potential energy decreases (c) is the the answer
Answer:
D
Explanation:
Just look at the groups and their tendencies. Or look at their electron configurations. You will notice that calcium has 2 valence electrons and bromine has 7 valence electrons.
Halogens have the most valence electrons possible without completing a shell (8 would be needed for that)
Answer:
x=2.
Explanation:
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In this case, since we have a mole ratio of moles of Cl to moles of Cu as 2.39, it is possible to write the following:
Thus, since the two possible copper chlorides are CuCl and CuCl₂, we can therefore infer that x=2 since it is close but not as close as it should to the whole number 2.
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There is a very likely chance that a color change indicated a chemical change. In order for an object to change color, a sample needs to change chemically so that it absorbs different light. I hope this helps. Let me know if anything is unclear or if you want further explanation.