DOES THE RESISTIVITY OF A SUBSTANCE CHANGE IF PHYSICAL CONDITIONS ARE CHANGED?

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Solution

The resistivity of a substance changes if the temperature of the substance is changed. The resistivity remains the same if we alter the physical dimension (length or breadth or area) of the substance.

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(i) Physical changes are easily reversible. (ii) Physical change does not produce new substance (iii) Physical change does not involve change in mass. Which of the following statement is correct?

Q. Matter undergoes a change. The changes are of two types : Physical and chemical change. A physical change is a change that involves only a change in the physical state of matter.
Its chemical properties remain the same. Usually increasing the temperature of applying pressure or both brings about a physical change. On reversing the condition, i.e., reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible. A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, the chemical and physical properties of the substance is formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance. When zinc carbonate is heated and cooled, the change(s) that are observed are :

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A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

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In a chemical change, the properties that change are :

Which of the following parameters of a substance does not alter during a physical change?

Q. Changes in which only ____________ properties of a substance change are called physical changes.

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