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प्रश्न
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
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उत्तर
Chemical Change.
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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.
Iron and rust are the same substances.
Fill in the blank.
Melting of ice is a _______ change.
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
What is a chemical reaction?
What do you understand by 'chemical reaction'?
What do you observe? When
Barium chloride is added to sodium sulphate solution
Name: Gas with rotten egg smell.
Give a chemical test to distinguish between the following gases.
H2 and CO2
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper nitrate to nitrogen dioxide
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Circle the odd one out. Give reason for your choice
Which of the following is not an “element + element → compound” type reaction?
______ is a natural indicator.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Which of the following is/are true when milk changes into curd?
- Its state is changed from liquid to semi solid.
- It changes colour.
- It changes taste.
- The change cannot be reversed.
Choose the correct option from below:
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Write five changes in the characteristics of a substance that can take place during a chemical change.
