Matching: place the name of the scientist in the blank next to their ideas about the atom.
democritus, thomson, rutherford, bohr
. he said that all positive charges were found in the central nucleus.
. he theorized that electrons were imbedded in the positive sphere, like a
chocolate chip cookie.
. he believed electrons were in fixed orbits.
. he named the atom

Explanation:

Rutherford → He said that all positive charges were found in the central nucleus.

Rutherford in 1909 , explained through his model that an atom is mostly an empty space with with electrons around the nucleus where all the positive charge is located.

Thomson → He theorized that electrons were embedded in the positive sphere, like a  chocolate chip cookie.

Thomson in 1904 , explained through his model that in an atom is a positive sphere of on which electrons are embedded similar plums on the plum pudding. Also an atom is electrically neutral specie.

Bohr → He believed electrons were in fixed orbits

Bohr in 1913 , explained through his model that in an atom , electrons revolves around the nucleus of an atom in a fixed orbits with foiced amount of energy which he named shells.

Democritus → He named the atom

A Greek philosopher who has used the term atom to describe the smallest u it of matter.

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.