What are the characteristics of a chemical change?

Permanent

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Formation of new substances

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Absorption or release of heat, light

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All of above

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Solution

The correct option is D All of above
A chemical change produces a new substance. The changes are permanent and mostly irreversible. Also, it involves absorption or release of energy in the form of heat or light.

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Q. Other signs of a chemical reaction might be an increase in temperature if heat is released or a change in _____.

Characteristic 1: chemical changes are irreversible

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Characteristic 3: properties of new substances are the same as the properties of original substances.

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 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.

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, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

In a chemical change, the properties that change are :

(a) What ar noble gases? What are the characteristics of the electronic configuration of noble gases?
(b) What is the cause of chemical bonding (or chemical combination ) of an atom of an element?

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What are the characteristics of a chemical change?

The correct option is D All of above A chemical change produces a new substance. The changes are permanent and mostly irreversible. Also, it involves absorption or release of energy in the form of heat or light.

The correct option is D All of above
A chemical change produces a new substance. The changes are permanent and mostly irreversible. Also, it involves absorption or release of energy in the form of heat or light.