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प्रश्न
Differentiate between in Chemical reaction and chemical equation.
उत्तर
| Chemical reaction | Chemical Equation |
| Any chemical change in matter which involves its transformation into one or more new substances is called a chemical reaction. | A chemical equation is the symbolic representation of a chemical reaction using the symbols and the formula of the substances involved in the reaction. |
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संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
How do the following help in bringing about a chemical change?
pressure.
Fill in the blank
A new substance is always formed in a _______ change.
Fill in the blank
A new substance is formed in a _______ change.
Write true or false :
Hydrogen sulphide has rotten egg smell .
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Balancing a chemical equation is based on
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
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 |
Define the following terms
Precipitate
What do you understand by 'chemical reaction'?
What do you observe? When
Barium chloride is added to sodium sulphate solution
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
Name: A brown gas
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
What do you observe when Cobalt chloride paper is introduced in water vapour.
Give a chemical test to distinguish between the following gases.
H2 and O2
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
True or False. If false, give the correct answer.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
Burning of paper is a ______ change.
Which of the following is not an “element + element → compound” type reaction?
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
______ change results in the change of the substance.
Photosynthesis is a chemical charge. Justify your answer.
