Mendeleev arranged the elements by what physical property? atomic number atomic mass boiling point density

Answer : The correct option is, Atomic mass.

Explanation :

According to Mendeleev, the elements and their compounds having same chemical properties showed a periodic trend. He arranged the elements having similar properties below each other into groups.

He arranged the elements in order of their increasing relative atomic masses.

Hence, the correct answer is, Atomic mass.

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.