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प्रश्न
Melting of wax is a change where a solid changes to a liquid state. Give one more such change which you observe in your surroundings
उत्तर
Melting of ice, melting of butter
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संबंधित प्रश्न
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Distillation is a method of obtaining pure ............. from a solution.
State four conditions necessary for a chemical reaction to take place.
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
What is thermochemical reactions?
