Boron is a metalloid, intermediate between metals and non-metals. It exists in many polymorphs (different crystal lattice structures), some more metallic than others. Metallic boron is extremely hard and has a very high melting point.
The total area that could be covered by this roll of tape is 0.1524 m².
<h3>What is the double-sided tape?</h3>
A double-sided tape is a tape that can be stick from both sides. It is used to stick something on a surface. A rectangle is an object that has four sides in which two sides are equal.
If we unroll the tape, we will see that it is a rectangle with dimensions:
length = 6.35 m
width = 1.2 x 10⁻² m
Since the tape has two sides, the total area of the tape is:
A = 2 x (length x width)
A = 2 x 6.35 x 1.2 x 10⁻²
A = 0.1524 m²
Thus, the total area of the tape is 0.1524 m²
To learn more about the area of rectangle, refer to the link:
brainly.com/question/8663941
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I think B because tiple bond
Answer:
<u>heptan-2-one</u>
Explanation:
In this case, the final product would be a ketone: <u>heptan-2-one</u>. To understand why this molecule is produced we have to check the<u> reaction mechanism</u>.
The first step is the <u>protonation</u> of the triple bond to produce the more stable carbocation (a secondary one) by the action of sulfuric acid 
. The next step is the <u>attack of water</u> to the carbocation to produce a new bond between C and the O, producing a positive charge in the oxygen. Then, a <u>deprotonation</u> step takes place to produce an <u>enol</u>. Finally, we will have a rearrangement (<u>keto-enol tautomerism</u>) to produce the final ketone.
See figure 1
I hope it helps!
Mostly in my opinion I think it’s the secound one
