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Cooling from Evaporation

Characteristi...

Question

How do you define a chemical change?

Give two or three examples of chemical change.

Choose the correct characteristic(s) about the chemical change from the following

Characteristic 1: chemical changes are irreversible

Characteristic 2: new substances are formed.

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

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Solution

The change in which the composition of the substance changes leading to the formation of new substances is called a chemical change.

Examples of chemical changes: burning of candle wax and burning of wood, etc.

Characteristics 1 and 2 are correct. During a chemical change, the properties of new substances are different from the properties of the original substances. Therefore, characteristic 3 is wrong.

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Question 5

Characteristic 1: chemical changes are irreversible

Characteristic 2: new substances are formed.

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

Q. Changes, in which new substances with different properties are formed, are called

(a) physical changes
(b) chemical changes
(c) irreversible changes
(d) reversible changes

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 :

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 :

Q. Which of the following is not a feature of chemical change?

(I) Original substance can be obtained by simple physical methods.
(II) It is a temporary change.
(III) The new substances formed have properties different from those of the reacting substances.

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