You want to place a piece of glass tubing into a rubber stopper after the tubing has been fire polished and cooled.
a. lubricating the tubing with water or glycerin.
b. using a towel or cotton gloves for protection.
c. twisting the tubing and stopper carefully.
d. all of the above.

In this case, it is required to use a towel or cotton gloves for protection, twist the tubing and stopper carefully, lubricate the tubing with water or glycerin (All options are correct).

Protective gloves are useful tools used during work in order to cover and protect the hands.Glycerol (glycerin) is a polyol liquid compound, which exhibits certain characteristics (i.e., it is colorless, odorless, and viscous).Glycerol is non-toxic and is an excellent water-based lube.

In conclusion, it is required to use a towel or cotton gloves for protection, twist the tubing and stopper carefully, lubricate the tubing with water or glycerin (All options are correct).

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0.385 J/g°C

Explanation:

Using the following formula, the specific heat of an elemental substance can be calculated:

Q = m × c × ∆T

Where;

Q = quantity of heat (J)

m = mass (g)

c = specific heat capacity (J/g°C)

∆T = change in temperature (°C)

Based on the given information, Q = 1375J, m = 50g, initial temperature = 22.8°C, final temperature = 94.2°C, c =?

Q = m × c × ∆T

1375 = 50 × c × (94.2 - 22.8°C)

1375 = 50 × c × 71.4

1375 = 3570c

c = 1375/3570

c = 0.3851

c = 0.385 J/g°C