Answer: option (3) Bromine combines with aluminum to produce AlBr₃.
Justification:
Look at each choice.
(1) Bromine is soluble in water.
Solubility is a physical property.
This is because solubility does modify the either the composition or the nature of the element (bromine).
Either as as liquid or into aqueous solution, bromine is the same element with atomic number 35: 35 protons and 35 electrons.
(2) Bromine has a reddish-brown color.
Color is also a physical property.
The color is determined by the reflection of the ligth and is not classified as a chemical property.
Even, imagine that the bromine is in a dark room. Could you tell its color? You could not. The color that you see depends on the light reflected by the object.
(3) Bromine combines with aluminum to produce AlBr₃.
This indeed is a chemical property.
3 atoms of bromine combine with 1 atom of aluminun in virtue of their chemical properties (atoms and electrons) to yield a specific chemical compound. That transformation is a chemical reaction. The Br atoms in the compound will no longer exhibit the properties of the pure element Br.
(4) Bromine changes from a liquid to a gas at 332 K and 1 atm.
Solid, liquid and gas are physical states of the matter.
The element bromine is the same as a liquid or a gas. The change from liquid to gas is a physical change. The temperatures and pressure at which that change happens is a physical property.
