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?

Academic Chemistry NCERT Class 6

No, the change in cement with water and heat is an irreversible change. The original substances cannot be formed on reversing the conditions.

Tutorialspoint

Updated on: 10-Oct-2022

133 Views

A cement company earns a profit of $Rs.\ 8$ per bag of white cement sold and a loss of $Rs.\ 5$ per bag of grey cement sold.(a) The company sells $3,000$ bags of white cement and $5,000$ bags of grey cement in a month. What is its profit or loss?(b) What is the number of white cement bags it must sell to have neither profit nor loss, if the number of grey bags sold is $6,400$ bags.
A cement company earns a profit of $â‚¹\ 9$ per bag of white cement sold and a loss of $â‚¹\ 5$ per bag of grey cement sold. The company sells $7000$ bags of white cement and $6000$ bags of grey cement for a month. What is its profit or loss?
If 7 bags of cement weigh 693 kg, what will be the weight of 15 bags of cement?
Name a waste gas released by the plants (a) only during the day time, and (b) only during the night time.
Which is the longest day and shortest night in the southern hemisphere?
What do you think are the reasons for erratic Weather changes these days?
What Do You Think Will Be the Biggest Focus in Digital Marketing?
What do you mean by reversed changes?
What could be the list of events that could be conducted in college on the occasion of National Science Day?
A rainbow can be seen in the sky$(a)$. when the sun is in front of you.$(b)$. when the sun is behind you.$(c)$. when the sun is overhead.$(d)$. only at the time of sun rise.
(a) Is the acceleration due to gravity of earth ‘g’ a constant? Discuss.(b) Calculate the acceleration due to gravity on the surface of a satellite having a mass of $7.4\times 1022\ kg$ and a radius of $1.74\times 106\ m$ $(G=6.7\times10^{-11}\ Nm^2/kg^2)$. Which satellite do you think it could be?
A student claims that because of atmospheric refraction, the sun can be seen after it has set, and the day is, therefore, longer than if the earth had no atmosphere.(a) What does the student mean by saying that the sun can be seen after it has set?(b) Do you think that the students conclusion is correct?
Rolling of chapati and baking of chapati are the changes that(a) can be reversed(b) cannot be reversed(c) can be reversed and cannot be reversed, respectively(d) cannot be reversed and can be reversed, respectively
If Google and Yahoo merged, what do you think will be the name of the new company?

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements