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BigorU [14]
3 years ago
10

What are the horizontal parts of the periodic table called

Chemistry
1 answer:
Andru [333]3 years ago
5 0
The Answer is Periods .
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Which half-reaction correctly represents reduction?
Neko [114]

Answer: B. Ca2+   +  2e- --------->   Ca

Explanation:

Reduction involves the gaining of electrons as well as a decrease in the oxidation state of the atom or ion.

In this case; Ca2+ gains two electrons and the oxidation state is reduced from +2 to  0.

Ca2+   +  2e- --------->   Ca

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3 years ago
Which of these are physical changes in matter chech all that apply
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a physical change doesn't change the chemical structure of an object. That is why the other 2 are wrong

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