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Changes,Reactions and Recap

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Question

Give reasons to show that the following are chemical changes :
Adding of calcium to water:

A

new substance is formed with different properties

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B

new substance is formed and has the same properties

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C

The reaction is reversible

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D

The reaction is irreversible

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Solution

The correct options are
A new substance is formed with different properties
D The reaction is irreversible
A chemical change is a permanent, not easily reversible change in which the identity of the substance is altered to produce one or more new substances.
$C a + H_{2} O \to C a (O H)_{2} + H_{2}$
as here new compound forms so it's a chemical change.

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Similar questions

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. 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.

Q. Statement (1) : Composition and molecular structure of the reactants can be changed by having a chemical change.
BECAUSE
Statement (2) : It is said to be a chemical reaction when new substances and new bonds are formed and old bonds are broken.

Q. Statement 1: No New substance is formed during a physical change.

Statement 2: New substances are formed during chemical 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 :

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