English

Define the following term: Chemical change - Chemistry

Advertisements
Advertisements

Question

Define the following term:

Chemical change

Definition

Solution

A chemical change is a permanent change in which the chemical composition of a substance is changed and one or more new substances with different chemical compositions and different properties are formed.

shaalaa.com
  Is there an error in this question or solution?
Chapter 2: Chemical Changes and Reactions - Exercise 2 (A)

APPEARS IN

Selina Concise Chemistry [English] Class 9 ICSE
Chapter 2 Chemical Changes and Reactions
Exercise 2 (A) | Q 2.1

RELATED QUESTIONS

The chemical name of baking soda is ______.


When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.


How do the following help in bringing about a chemical change?

light.


Name three biochemical catalysts found in the human body.


Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  


Complete and balance the following chemical equations:

Ba`"CI"_2`   +  `"H"_2"SO"_4`   `→`

    (aq.)           (aq.)


FILL IN THE BLANK

In a double decomposition precipitation reaction both the reactants must be ............ soluble.


Balance the following equation :

Fe + H2O → Fe3O4 + H2


State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .


Write the chemical reaction where the following changes are observed.

Colour change is noticed


Write the chemical reaction where the following changes are observed.

Precipitate is formed


Name the gases which Turn moist red litmus blue.


Distinguish by heating the following in dry test tubs.

Copper Sulphate and copper carbonate


Select the correct answer for the following options:

The black residue obtained on heating copper carbonate.


Select the correct answer for the following options:

The gas obtained when potassium chlorate is heated in the presence of a catalyst.


Give reason for the following:

Electrolytic decomposition of water is a reaction involving change of state.


NPK are the primary nutrients for plants.


Silver metal can displace hydrogen gas from nitric acid.


Silver articles turning black: ______:: Boiling of H2O: physical change ______.


What is thermochemical reactions?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×