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Alex Ar [27]
3 years ago
7

Please Help

Chemistry
1 answer:
Yuri [45]3 years ago
5 0
I believe it is A because a physical change is something that can be changed back to where a chemical change can not be such as burning something.
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When a barium atom loses two electrons what charge does it have
Darya [45]

Answer:

It becomes a positive ion and its radius decreases

Explanation:

As per the Octet rule, Barium has 2 electrons in its outermost shell. When it loses the two electron it gains two positive charge i.e Ba2+. As the barium loses the two electron from its outermost shell, the outermost shell becomes vacant and thus is no more considered as a part of atomic geometry of the barium atom and since the outermost shell is considered negligible the radius of barium atom reduces automatically.  

6 0
3 years ago
Calculate the average atomic mass of boron (B), which has two isotopes: B-10 with 19.9% natural abundance, and B-11 with 80.1% a
lina2011 [118]

Answer:

The average atomic mass of boron is found to be  

10.80

Explanation:

also u answered it urself

6 0
4 years ago
What statement accurately describes the charge of the nucleus of an atom?
Evgen [1.6K]
The charge of a nucleus is positive
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3 years ago
Endothermic or exothermic?
Tju [1.3M]

Answer:

Endothermic

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Explanation:

Endothermic is when a reaction absorbs heat.

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6 0
3 years ago
Please help me with this thank you I’ll give extra credit! Thank you againnnn !!
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Answer: i have not 1 idea

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4 0
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