The book procedure calls for 2,5-dimethylhexane-2,5-diol and concentrated hydrochloric acid to be shaken in a reaction vial. which of the following is a hazard associated with this procedure?
a) hydrochloric acid can cause skin and eye burns, so gloves and goggles must be worn.
b) hydrochloric acid has irritating vapors, and must be used in the fume hood
c) the vial may build up pressure. be sure to vent the vial frequently, and keep the glass sash of the fume hood between you and the vial.
d) the vial could be dropped, splashing hydrochloric acid. keep the vial well inside the hood.
e) all of the above.

E) All of the above.

Explanation:

Hello,

Since the acidic nature of the HCl implies its corrosiveness, when it is in contact with the skin and eyes the burning starts immediately, so gloves and goggles must be worn. Next, the fuming hydrochloric acid (37% by mass) is volatile so it gives off even when dissolved into water, so it must be used in the fume hood. Then, since vapors are produced during the chemical reaction, an overpressure could be attained, that's why we must keep the glass sash of the fume hood between us and the vial. As a common risk, the vial could be dropped causing the hydrochloric acid to splash, so we must keep the vial well inside the hood.

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Here's what I get  

Explanation:

i. E = mc²

E = energy

m = mass

c = the speed of light

"Energy equals mass times the square of the speed of light.”

The equation says that energy and mass are interchangeable. If you multiply the mass of an object by c², you get its equivalent and of energy.

The SI base units for energy are kg·m²s⁻².  

The most common derived unit is the joule (J). Others are the newton-metre (N·m), kilowatt-hour (kWh), watt-second (W·s), and volt-coulomb (V·C).

ii. Nuclear vs chemical reactions

a. Alpha decay

A nuclear reaction — like α decay — takes place in the nucleus of an atom.

An element becomes a different element.

b. Chemical reaction

Na· + ·Cl ⟶ Na⁺ + Cl⁻

A chemical reaction — like the formation of NaCl — involves rearranging the electrons, which are outside the nucleus.

The elements do not change.

Salt still consists of sodium and chlorine.