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प्रश्न
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
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उत्तर
Melting of ice, melting of butter
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
Complete the statement by filling the gap using an 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.
Define an electrochemical reaction.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
