Astudent does a chemical reaction with two chemicals. the total mass of the two chemicals is 45.0 grams. when she is done, she finds that the mass of all the chemicals she has collected is now only 34.5 grams. has she collected all the products of the reaction? explain your answer.

No, she has not collected all the products of the reaction.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Given: Mass of reactants = 45.0 grams

Mass of products = 34.5 grams

Difference = Mass of reactants - Mass of products = 45.0 - 34.5 = 10.5 g

As mass of reactants has to be equal to the mass of products, the student has not collected all the products of the reaction.

the role of the microscope world in creating new materials .

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.