The ion 27al3+ contains which combination of protons, neutrons, and electrons?

This ion has 13 protons, 14 neutrons and 10 electrons.

Explanation:

An ion is formed when an atom looses or gains electron.

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Atomic mass is defined as the sum of number of protons and neutrons that are present in an atom.

Atomic mass = Number of protons + Number of neutrons

For the given representation of ion, which is:  

We are given:

Atomic number = Number of protons = 13

Number of electrons = Number of protons - charge = 13 - (+3) = 10

Mass number = 27

Number of neutrons = Atomic number - Mass number = 27 - 13 = 14

Hence, this ion has 13 protons, 14 neutrons and 10 electrons.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.