Which of the following laboratory procedures best illustrates the law of conservation of mass? reacting 12 g of c with 32 g of o2 to form 44 g of co2 and unused reactants weighing 100 g of cu powder and 100 g of fe filings heating 100 g of caco3 to produce 56 g of cao dissolving 10 g of nacl in 100 g of water

The correct statement is reacting 12 g of C with 32 g of to form 44 g of and unused reactants.

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed, but it can only be transformed from one form to another. The total mass in the reaction remains constant.

From the given options:

The equation for this is given by:

Mass on the reactant side = (12 + 32)g = 44 g

Mass on the product side = 44 g

Hence, this equation follows Law of Conservation of mass.

As, there is no equation formed, so there will be no chemical reaction and will not follow, law of conservation of mass.

The equation for this is given by:

Mass on the reactant side = 100 g

Mass on the product side = (56 + 0)g = 56g

Hence, this equation does not follow Law of Conservation of mass.

As, salt is getting dissolved in water and hence, it is a physical change and will not follow law of conservation of mass.

Therefore, the correct statement is reacting 12 g of C with 32 g of to form 44 g of and unused reactants.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.

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.