Which Of The Following Statements Is True About Chemical Change?

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Which of the following statements is true?

A. The total mass of the system remains same in a chemical change

B. A chemical change is permanent and irreversible

C. A physical change is temporary and reversible

D. All of the above

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Which of the following statements is true about chemical change

Correct Answer:

D. All of the above

Explanation

The total mass of the system remains same in a chemical change.

It is a common misconception that the total mass of a system changes during a chemical reaction. However, this is not the case - the total mass of the reactants and products must always be equal. This is because matter can neither be created nor destroyed - it can only be transformed. This principle, known as the law of conservation of mass, is one of the most important laws in chemistry. It states that, during any chemical reaction, the total mass of the reactants must always equal the total mass of the products. This law applies to all types of reactions, including nuclear reactions, and is a fundamental principle of our understanding of matter.

A chemical change is permanent and irreversible.

A chemical change is a change that alters the composition of a substance. This can be done through the addition or removal of atoms, or through a rearrangement of the atoms themselves. Chemical changes are usually permanent and irreversible, meaning that the original substance cannot be recovered once the change has taken place. This is in contrast to physical changes, which are changes that do not alter the composition of a substance. Physical changes are usually temporary and reversible, meaning that the original substance can be recovered.

For example, if you cut a piece of paper in half, it is a physical change. However, if you burn the paper, it is a chemical change. Once the paper has been burned, it cannot be un-burned. This is why chemical changes are often considered to be more significant than physical changes.

A physical change is temporary and reversible.

A physical change is a change to the form or appearance of a substance, but not to its chemical composition. Physical changes are usually reversible, meaning they can be undone. For example, if you melt a piece of ice, it will turn back into a solid if you leave it out long enough. Some physical changes require an external agent to reverse them, such as melting a piece of metal in a furnace. Other physical changes, such as cutting paper or bending metal, are irreversible. In these cases, the original shape cannot be restored. Although physical changes are not permanent, they can sometimes have a lasting effect. For example, iron rusts when it is exposed to oxygen and moisture. Once iron rusts, it can never be turned back into iron. However, there are ways to prevent iron from rusting, such as painting it or keeping it dry.

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