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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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16y ago

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

In physical changes, the total amount of energy before and after remains the same as no new substances are formed. In chemical changes, there may be a difference in the total amount of energy before and after the reaction due to the formation of new substances and the breaking or forming of chemical bonds.


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

Energy is conserved in a chemical reaction, meaning the total amount of energy before and after the reaction remains constant. This principle is known as the law of conservation of energy.


The amount of energy needed to cause a chemical reaction to occur is the?

The amount of energy necessary to cause a chemical reaction to occur is called activation energy.


Did you recover the same amount of copper you started with?

Yes, the amount of copper recovered through a chemical reaction or a purification process typically matches the initial amount that was present before the reaction or process began.


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.


What is the amount of energy needed to get a chemical reaction started known as?

The amount of energy needed to start a chemical reaction is known as the activation energy. This energy is required to break the existing bonds in the reactants before new bonds can be formed in the 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.


What is the products of a chemical reaction?

The products of a chemical reaction are the substances that are formed as a result of the reaction taking place. These products can be different compounds or elements from the reactants that were present before the reaction occurred.


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

true


What do you call the substances before a chemical reaction takes place?

These initial substances are the reactants.