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प्रश्न
Fill in the blank:
The substances which undergo chemical change are called _______
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उत्तर
The substances which undergo chemical change are called reactants .
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संबंधित प्रश्न
Write true or false :
No new substance is formed during a chemical reaction.
Explain the following reaction with one suitable example of Displacement reaction.
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)
Oxygen is a ______ in respiration.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Give an example of a reaction where the following are involved:
Close contact
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
What do you observe? When
Water is added to the quick lime.
State the main characteristics of chemical reactions. Give at least one example in each case.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Iron and rust are the same substances.
The chemical name of baking soda is sodium bicarbonate.
How can we prevent rusting?
______ is a chemical substance is used in whitewashing.
Write the effects of chemical reactions.
