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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.

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15y ago
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MASON

Lvl 6
3y ago

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.

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13y ago

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.

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12y ago

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

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13y ago

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

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13y ago

Gotta be the same. Law of conservation of mass.

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11y ago

The mass before is always higher before than after,

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

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10y ago

The total matter involved remain unchanged.

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Q: How does the total amount of matter before a chemical reaction compare to the total amount of matter after the reaction?
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Related questions

He total amount of energy before and after a chemical reaction is the same. Therefore energy is .?

Conserved.


Compare the total amount of energy before and after physical and chemical changes?

Physical Change-- Same amount of energy, but in different form Chemical Change-- Different amount of energy, and in a different form


The total amount of energy before and after a chemical reaction is the same .Thus energy is what?

Therefore energy is conserved.


Define limiting reactant?

In a chemical reaction the limitting reactant is also know as limiting reagent.it is the substance which is totally consumed when the chemical reaction is complete.the reacton can not proceed without it.


How does a chemical equation show that a chemical reaction has occurred?

A chemical equation shows that chemical reaction has occurred as new substances have been formed from the reagents. A chemical equation has two sides before reaction and after reaction, if there is any change from the before reaction side to the after reaction side, it indicates that a chemical reaction has just occurred.


What is present after a chemical reaction?

That depends on the chemicals present before the chemical reaction and sometimes the conditions under which the chemical reaction occurred.


When a chemical reaction occurs the compounds remain the same as before the reaction?

After a chemical reaction the reactants are transformed in products.


In a chemical reaction the total mass of the substances before the reaction is?

The mass of all substances before a chemical reaction is equal to the mass of the substance after the reaction. This is under the law of conservation of mass.


Are chemical reactions a chemical change of original substances before a chemical reaction takes a place?

Substances are changed only after the beginning of a chemical reaction.


The new substances produced in a chemical reaction have?

different chemical properties from whence they came. They have different chemical bonds than before (the definition of a chemical reaction).


Do the compounds remain the same as before the reaction when a chemical reaction occurs?

true


Is it true that in a chemical reaction reactants are changed into products?

no, it is before the reaction