How does the total amount of matter before a chemical reaction compare to the total amount of matter after the reaction?

Answer 1

If the experiment is done in a contained unit (like a bag) where no gas can escape, the mass should be the same before and after. The concept is called the Conservation of Mass, and it applies for all physical and chemical changes. If the experiment is done in a contained unit (like a bag) where no gas can escape, the mass should be the same before and after. The concept is called the Conservation of Mass, and it applies for all physical and chemical changes.

Answer 2

In science, a law is a general statement that explains a large number of observations. Before being accepted, a law must be verified many times under many conditions. Laws are therefore considered the highest form of scientific knowledge and are generally thought to be inviolable. Scientific laws form the core of scientific knowledge.

One scientific law that provides the foundation for understanding in chemistry is the law of conservation of matter. It states that in any given system that is closed to the transfer of matter (in and out), the amount of matter in the system stays constant. A concise way of expressing this law is to say that the amount of matter in a system is conserved.

What does this mean for chemistry? In any chemical change, one or more initial substances change into a different substance or substances. Both the initial and final substances are composed of atoms because all matter is composed of atoms. According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and type of atoms after the chemical change as were present before the chemical change.

Before looking at explicit examples of the law of conservation of matter, we need to examine the method chemists use to represent chemical changes.

Answer 3

it has to balance - therefore the mass before the reaction and the mass after the reaction but be the same since nothing is created or lost.

Answer 4

Yes. This is due to the law of conservation of mass/matter.

Answer 5

They are exactly the same, by the law of conservation of mass. Be sure to consider mass of gases throughout reaction

Answer 6

Gotta be the same. Law of conservation of mass.

Answer 7

The mass before is always higher before than after,

the difference is the energy (equivalent [e=mc2]) released in the reaction.

Answer 8

The total matter involved remain unchanged.