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प्रश्न
Changes in which new substances are formed are called ______ changes.
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उत्तर
Changes in which new substances are formed are called chemical changes.
Explanation:
Chemical changes result in the formation of one or more new substances with different properties from the original.
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संबंधित प्रश्न
Name three biochemical catalysts found in the human body.
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Explain the term chemical reaction with special reference to reactants and products.
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Mention the various conditions required for a chemical reaction to occur.
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
Photosynthesis is a chemical charge. Justify your answer.
