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प्रश्न
What is a chemical reaction?
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उत्तर
“Chemical reaction is a chemical change in which matter changes into a new substance or substances.”
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
What do you observe when :
an iron nail is kept in tap water for few days
Give an example of a reaction where the following are involved:
Close contact
Explain,giving one example of the following chemical changes:
Reversible reaction
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
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.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
_____ is the basic material to manufacture urea.
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Which of the following is a chemical change?
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.
Write a word equation for the chemical change, if any.
Give an example where heat, light, and sound are produced during a chemical change.
Chemical changes are important in our day-to-day life. Give examples.
Write a note on the following:
Fermentation
Photosynthesis is a chemical charge. Justify your answer.
