Advertisements
Advertisements
प्रश्न
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Advertisements
उत्तर
In this case, the changes cannot be reversed. This is because the cement that hardens up after getting wet cannot be obtained back.
संबंधित प्रश्न
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Explain by writing a word equation.
Respiration is a chemical change.
Name: A brown gas
Give a chemical test to distinguish between the following gases.
H2 and O2
Give a chemical test to distinguish between the following gases.
HCl and H2S
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.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
What is thermochemical reactions?
