1.when electricity is passed through water then two gases hydrogen and oxygen are produced ,on the other hand when heat is supplied to water then another gas steam is produced what type of change takes place?
a. In the first case?
b. In the second case?
2. a white powder substance x immediately sets into a hard mass on adding a liquid y to it .In hospitals in thick coat of paste of substance X is applied over the bandage on the fractured bone of a patient to keep the fractured bone in place to get joint properly.
a. what could the substance X be ?
b.name the liquid y ?
c. what type of change occurs in X on adding y ?
for class six
please answer quickly
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Answer:
1.a. chemical change
b. physical change
2.a.POP
b.water
c.physical change
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