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प्रश्न
Explain the term chemical reaction with special reference to reactants and products.
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उत्तर
A chemical reaction is a transformation in which matter transforms into one or more new compounds. Reactants are substances or substances that participate in a chemical reaction; these are changed into products, which are one or more new compounds.
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संबंधित प्रश्न
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
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)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Give a chemical test to distinguish between the following gases.
NH3 and SO2
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.
The percentage composition of Nitrogen in Ureas is ______.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
