Question 16 After a chemical reaction occurs in an open test tube,
measurements indicate that the mass of the reactants is greater
than the mass of the products remaining in the test tube. What
most likely explains the measurements ?
A
A gas was produced.
B
A solid was produced.
с
The salinity of the reactants was high.
D
The temperature of the reactants was low.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

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.

answermeridional ;