The label on a chemical in a science laboratory reads, “Strong Acid.” Based on this label, what can a student best determine about the chemical? A. It has a low pH.
B. It is a clear liquid.
C. It has a high density.
D. It has a low melting point.

A. It has a low pH.

Explanation:

A.  It has a low pH

Explanation:

pH scale is 0 to 14 with 7 being neutral.  Any thing below 7 is acidic  Above 7 is a base or alkaline

Lower the pH the more careful you must be when handling the chemical.  Strong Acid can do irreparable harm to eyes, skin, mucus membranes, eat holes in clothing etc.  USE APPROPRIATE PPE

Below is pasted in definition you can look up in your textbook or online search.

pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.