मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

State Four Conditions Necessary for Chemical Reactions to Take Place.

Advertisements
Advertisements

प्रश्न

State four conditions necessary for chemical reactions to take place.

एका वाक्यात उत्तर
Advertisements

उत्तर

Conditions necessary for chemical reactions :

  1. Close contact
  2. Solution form
  3. Heat
  4. Light
  5. Catalyst
shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 5: Language of Chemistry - Exercise

APPEARS IN

सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Exercise | Q 2

संबंधित प्रश्‍न

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

pressure.


 Fill in the blank.
 The formation of gas bubbles in a liquid during a reaction is called ......................


 Fill in the blank

A change in which the substance can be brought back to its original state is called a _______ change.


Define the following term:

Precipitate


Give an example of a reaction where the following are involved

Light


Give a chemical test to distinguish between the following gases. 

NH3 and HCl


Distinguish by heating the following in dry test tubs.

Zinc carbonate, Copper carbonate and lead carbonate.


Distinguish by heating the following in dry test tubs.

Zinc nitrate and copper nitrate.


Distinguish by heating the following in dry test tubs.

Ammonium Chloride and iodine.


Give a word equation for the following reaction.

A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.


State the following reaction represent oxidation or reduction.

\[\ce{Fe++->Fe+++}\]


Select the correct answer from the options given below:

State the gaseous product formed, when

An active metal reacts with dilute sulphuric acid.


What happens when cane sugar is strongly heated? Mention any two changes in it.


The chemical change is ______.


Explain the following statement: Digestion is a chemical change.


Mention the various conditions required for a chemical reaction to occur.


The changes in which new substance with new chemical properties are formed are ______.


Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.


Is the conversion of milk into ice cream a chemical change?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×