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Define the Following Terms Precipitate - Chemistry

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प्रश्न

Define the following terms

Precipitate

परिभाषा

उत्तर

Chemical reactions which are characterised by the formation of insoluble solid substances are called precipitates.

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अध्याय 2: Chemical Changes and Reactions - Exercise 2 (A) [पृष्ठ २३]

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सेलिना Concise Chemistry [English] Class 9 ICSE
अध्याय 2 Chemical Changes and Reactions
Exercise 2 (A) | Q 2.4 | पृष्ठ २३

संबंधित प्रश्न

The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.


Complete and balance the following chemical equations

NaCI + `AgNO_3`  `→`


FILL IN THE BLANK

In a ............ change, new substances are formed.


TRUE \ FALSE

Copper can displace iron from iron sulphate.


TRUE \ FALSE

Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?


What are homogenous reactions ?


What are the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.


Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.

Sodium chloride


Give an example of a reaction where the following are involved:

Solution


What is a chemical change? Give two examples of chemical change?


Name: Gas with rotten egg smell. 


Complete the following table and write your observations.

 

Hydrogen sulphide

Ammonia

Sulphur dioxide

Hydrogen chloride

Shake the gas with red litmus solution

       

Shake the gas with blue litmus solution

       

Apply a burning splint to a gas

       

Give a word equation for the following reaction.

An exothermic reaction where both the reactants are gases, one of which is oxygen.


Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.


Complete the table given below.

Addition of dil. H2SO4 to KHCO3  Name of residue obtained  

______ gas causes tears in our eyes while cutting onions.


Which of the following is not an “element + element → compound” type reaction?


Match the following:

1. Sodium Chloride a. CaSO41/2H2O
2. Calcium sulphate dihydrate b. C2H5Oh
3. Magnesium sulphate hydrate c. CaSO4.2H2O
4. Calcium sulphate hemihydrate d. NaCl
5. Phenol e. MgSO4.H2O

Classify the following as physical or chemical properties

Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.


______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.


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