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Yes they can. Although conservation of mass holds for many processes (including many types of reactions), there are reactions that can reduce the amount of matter in a system (including closed systems). For example, the amount of matter is not conserved for a closed system that has undergone a nuclear reaction (fission, fusion).
Nuclear Fusion is a nuclear reaction by which two nuclei fuse to form a single (and more massive) nucleus. Consider two nuclei with masses m1 and m2 . The INITIAL total mass of the SYSTEM is m1 + m2 = M. After the nuclei fuse, you are left with a single nucleus with mass M" (the FINAL SYSTEM mass) that is more massive than both m1 and m2:
M" > m1 AND M" > m2
BUT it turns out that the INITIAL SYSTEM mass, M, is greater than the FINAL SYSTEM mass:
M > M" SO THAT ---> M - M" > 0
clearly the amount of matter in this closed system has changed, but what happened to the amount of matter that is missing?
m0 = M - M" -----> M" + m0 = M BUT where is m0?!!!!
Well, it turns out that the mass m0 was converted to energy (THINK E = m0 c^2). What type of energy you ask? Well, usually it's in the form of electromagnetic energy. That is, when two nuclei undergo the process of fusion, the system emits electromagnetic radiation. The energy is stored in the electric and magnetic fields associated with the electromagnetic waves emitted.
What else can I help you with?
Matter can be both created and destroyed?
Matter cannot be created or destroyed according to the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. However, matter can undergo physical or chemical changes where its form or state can change, but the total amount of matter remains constant.
How does a chemical change affect the composition of matter?
chemical change = chemical reaction. ( the composition of matter always changes). In a chemical change the matter in one thing changes, for example you will know a chemical change has occurred when the color or odor has changes or when a new gas is given off.
What is a chemical reaction and how are reactants and products involved?
A chemical reaction is a change in which one kind of matter changes into a different kind of matter with different properties. Reactant is a substance used in a chemical reaction and a product is a substance made in a chemical reaction. Hope this is helpful! ;)
Is mass a chemical property?
No, mass is not a chemical property. Mass is a physical property that refers to the amount of matter an object contains. Chemical properties, on the other hand, describe how a substance interacts with other substances in a chemical reaction.
Is heating sulfur a physical or chemical change?
Heating sulfur is a physical change. You're not changing the chemical composition of the sulfur, just the temperature. Now if you heat it to its boiling point and and it changes to a vapor it's a chemical change because you've changed its state of matter.(Actually changing the state of matter of an object is still a physical change, as it does not change the chemical composition of the element)
When a chemical change occurs what do you know about the amount of matter in the new substances What is this known as?
In a chemical change, the amount of matter in the new substances remains constant. This is known as the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged.
A change in matter that produces new substances is called?
Chemical change. References: Intro to Matter book.
Is it true that the amount of matter present appears to change during a chemical reaction?
The total mass remain unchanged.
Why the amount of reactant and product do not change in reversible reaction?
The amount of reactants and products do not change in reversible reactions because, in a chemical reaction, matter is neither created nor destroyed -- it is only rearranged. This is the law of conservation of matter.
New substances are always formed when matter undergoes what?
chemical change.
When is a reaction considered chemical?
A reaction is considered chemical when bonds between atoms are broken and new bonds are formed, resulting in a change in the chemical composition of the substances involved. Physical changes, on the other hand, do not involve changes in the chemical composition of the substances.
In a chemical reaction does the amount of matter increase or decrease?
In a chemical reaction, the amount of matter remains the same. This is known as the Law of Conservation of Mass, which states that matter cannot be created or destroyed in a chemical reaction; it can only be rearranged.
A change in matter that produces one or more new substance is a?
chemical reaction. In a chemical reaction, the atoms of one or more substances are rearranged to form new substances with different properties. This process involves breaking and forming chemical bonds.
What is a chemical reaction and how are reaction and products involved?
A chemical reaction is a change in which one kind of matter changes into a different kind of matter with different properties. Reactant is a substance used in a chemical reaction and a product is a substance made in a chemical reaction. Hope this is helpful! ;)
How Does the total amount of matter in a substance increase decrease or stay the same after a chemical or physical change?
The total amount of matter in a substance remains the same after both chemical and physical changes. This is known as the Law of Conservation of Mass, which states that matter cannot be created or destroyed in a chemical reaction or physical change, only rearranged. So, the total mass of the substances before and after the change will be equal.
How often does a change in the composition of matter occur during a chemical reaction?
A change in the composition of matter occurs during every chemical reaction. This involves the breaking and forming of chemical bonds, leading to the rearrangement of atoms to create new substances with different properties.
Why the amounts of reactants and products do not change in a reversible reaction?
The amount of reactants and products do not change in reversible reactions because, in a chemical reaction, matter is neither created nor destroyed -- it is only rearranged. This is the law of conservation of matter.
