Question

Each student in Ms. Major's class was given an unknown substance. Ms. Major gave her students a list, shown below, of substances and their properties to help them identify their unknown.

Substance Density Boiling Point Appearance
Water 1.0 g/mL 100°C colorless liquid
Ethanol 0.789 g/mL 78.4°C colorless liquid
Sodium Hydroxide 2.13 g/mL 1388°C white solid
Phosphoric Acid 1.685 g/mL 158°C white solid or colorless liquid


If a student's unknown is a colorless liquid and its boiling point was measured to be about 78°C, it is most likely _______.
A.
phosphoric acid
B.
ethanol
C.
sodium hydroxide
D.
water

Answer 1

Answer: (C) Ethanol

Explanation: We can infer that the answer is ethanol because it says that unknown substance is colorless and has a boiling point of about 78 degrees Celsius.

The answer is Ethanol because it is both a colorless liquid and has a boiling point of 78.4 degrees Celsius and 78.4 is about 78.

I hope this was helpful :)