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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Give Reason. Wasp Sting is Treated with Vinegar. - Chemistry

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प्रश्न

Give reason.

Wasp sting is treated with vinegar.

उत्तर

Wasp stings are alkaline and they can be neutralized by vinegar which is a weak acid.

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पाठ 6: Chemical Reactions - Exercise 2 [पृष्ठ ८६]

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सेलिना Concise Chemistry [English] Class 8 ICSE
पाठ 6 Chemical Reactions
Exercise 2 | Q 8.3 | पृष्ठ ८६

संबंधित प्रश्‍न

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

pressure.


Complete and balance the following chemical equations

Na + H2 O →


Fill in the blanK

 A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.


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


What are chemical reactions?


Is kerosene an electrolyte or a non-electrolyte ?


Fill in the blank:
The substances which undergo chemical change are called _______


Fill in the blank:

In some chemical reactions an insoluble ________ is formed when two solutions are mixed.


Write true or false :

When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .


Explain the following reaction with one suitable example of Double decomposition reaction.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

Oxygen is a ______ in respiration.


Explain by writing a word equation.

Bubbles are seen on adding lemon juice to baking soda.


Give reason for the following:

Silver nitrate solution is kept in coloured bottles.


What do you observe? When

Barium chloride is added to sodium sulphate solution


Name: Gas with rotten egg smell. 


Give a chemical test to distinguish between the following gases. 

H2 and O2


Give a word equation for the following reaction.

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


Complete the table given below.

Heat on iodine crystals Colour of vapours evolved  

State whether the following reaction is oxidation or reduction.

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


Give a balanced equation for the conversion of an ammonium salt to a basic gas.


Select the correct answer from the options given below:

State the gaseous product formed, when

An active metal reacts with dilute sulphuric acid.


Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Ammonium dichromate.


True or False. If false, give the correct answer.

Taking a glass of water and freezing it by placing it in the freezer is a chemical change.


A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?


Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.


A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

Are these changes chemical in nature?


Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.


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


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