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Temporary or Permanent Changes

A bag of ceme...

Question

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?

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Solution

A bag of cement that has been wet due to rain during the night becomes hard. This is because the cement hardens up after absorbing water.

Hence, the changes that have occurred in the cement could not be reversed.

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Question 2

Which of the following changes cannot be reversed?
(a) Hardening of cement
(b) Freezing of ice cream
(c) Opening a door
(d) Melting of chocolate

Q. In cements, generally the increase in strength during a period of 14 days to 28 days is primarily due to

Q. In cement, generally the increase in strength during a period of 14 days to 28 days is primarily due to:

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.

Q. solve:
X sold to Y all 700 bags of cement lying in his Delhi godown State the legal position
(I) if unknown to X, all bags had been stolen before the contract was made,
(II) if unknown to X, the cement had becomes stone as a result of heavy rain fall,
(Ill) if unknown to X, 109 bags had been stolen at the time of making the contract.

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Temporary or Permanent Changes

Standard VI Chemistry

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