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Heat of Reaction

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Question

---------------- and -------------- are two important determinants that can change any substance into a resource

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Time and Technology

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Q. Name the two factors that can change substances into resources.

Q. Which of the following factors change a substance into a resource?

Answer the following questions.

(i)Which are the two main climatic factors responsible for soil formation?

(ii)Write any two reasons for land degradation today.

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(iv)Name any two steps that government has taken to conserve plants and animals.

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Q. Following are the observations of changes that have taken place. Classify them into chemical change or a physical change. [5 MARKS]

1. The change is temporary and can be reversed by changing the conditions in most of the cases.
2. New substance(s) is/are formed.
3. The chemical properties of the original substance remain the same.
4. There is an exchange of energy during this change which means that heat and light may be given out or absorbed.
5. As a result of the change, there may or may not be any change in the energy possessed by the original substance.
6. There is no change in the chemical composition of the original substance.
7. The change is permanent and cannot be reversed by changing the conditions or through ordinary physical processes.
8. There may or may not be any change in the state, size, shape, colour, and smell of the substance that undergoes this change.
9. The composition and the properties of the parent substance or substances change.
10. There is usually a change in the mass of the parent substance/s as well.

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