Which describes the enthalpy change associated with an endothermic reaction? a) it is negative because the enthalpy of the products is greater than the enthalpy of the reactants. b) it is positive because the enthalpy of the products is greater than the enthalpy of the reactants. c) it is negative because the enthalpy of the reactants is greater than the enthalpy of the products. d) it is positive because the enthalpy of the reactants is greater than the enthalpy of the products.

there are no statements provided but here is why:

sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

hope this

i'm assuming that the correct answer is indeed the first one/ "a"..

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.

gas

explanation:

smoke is the matter of a gas