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LenKa [72]
3 years ago
15

50 POINTS!!!!!!!!!!!

Chemistry
2 answers:
Pani-rosa [81]3 years ago
6 0

Answer:

c

Explanation:

kifflom [539]3 years ago
5 0
A substitution is a mutation that exchanges one base for another. This can include a change in a single chemical letter. ex. changing a to g or in your case g to a. I believe the correct answer should be B.
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Why is it good to use blue and red litmus for the same solution?
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Under acidic conditions, the solution is red, and under alkaline conditions, the solution is blue. Chemical reactions other than acid-base can also cause a color change to litmus paper. For instance, chlorine gas turns blue litmus paper white – the litmus dye is bleached, because of presence of hypochlorite ions.

6 0
3 years ago
What’s the correct answer
Fed [463]
The correct answer is: 
_________________________________________________________
    " F  and Br , because they are in the same group" .
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Note:
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Choice [B]:  "F and Br ; because they are in the same period" ; is incorrect; since  "F" and "Br" are not in the same "period" (that is, "row").
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Choice [C]:  "Na and Mg; because they are in the same group {"column"} ;  is incorrect; since:  "Na" and "Mg are NOT in the same group {"column"].
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Choice [D]:  "Na and Mg" ; because they are in the same period {"row"}; is incorrect.  Note:  "Na" and "Mg" are, in fact,  in the same period {"row"}. However, as aforementioned, {Mg and Na} are not in the same group {"column".}.  

Note:  The similiarities in physical and chemistry properties among elements are determined and organized — or tend to be so—by "groups" {"columns"} — NOT by "periods" {rows}.  
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3 years ago
Is a girl doing any work while she stands still and holds a box? Why or why not?
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Yes because she is holding the weight of the box.
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If an insect population increases and then decreases as the available supply of food changes, what does this demonstrate
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D.

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