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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
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
FILL IN THE BLANK
Negatively charged ions are called ..........
Fill in the blank
A new substance is formed in a _______ change.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Explain the following reaction with one suitable example of Decomposition reaction
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
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.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Give an example of a reaction where the following are involved:
Solution
Give an example of the following chemical change.
Two gases combine to form white solid
What do you observe? When
Barium chloride is added to sodium sulphate solution
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
What do you observe when CO2 is passed through lime water first and then a little in excess.
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
A reaction between an acid and a base is called ______.
Chemical changes are important in our day-to-day life. Give examples.
Why is spoiling food a chemical change?
