Subject :NSO Class : Class 6
A potter shapes pots out of clay (Process 1). He then bakes the pots in an oven (Process 2). Which of the following statements is correct?
A Process 1 is a reversible, physical change while process 2 is an irreversible, physical change.
B Process 1 is an irreversible, physical change while process 2 is an irreversible, chemical change.
C Process 1 is a reversible, physical change while process 2 is an irreversible, chemical change.
D None of these.
Is it A or C?
Ans 1:
Class : Class 6
on heating, the clay pot doesn't turn into stone,right?it doesn't change composition once heated , it is still clay ! answer is "A"
Ans 2:
Class : Class 6
It really should be A
Ans 3:
Class : Class 6
A is the correct answer
Ans 4:
Class : Class 6
The answer is A.
Ans 5:
Class : Class 8
answer is a
Ans 6:
Class : Class 6
It should be A
Ans 7:
Class : Class 6
IF WE SHARP A PENCIL IT IS A PHYSICAL IRREVERSIBLE CHANGE .SO,IF WE HEAT A POT IS PHYSICAL IRREVERSIBLE CHANGE. BUT IT COULD HAPPEN THAT THE COMPOSITION OF CLAY MIGHT CHANE BECAUSE OF HEATING AS THE MOLECULES STICK TO EACH OTHER
Ans 8:
Class : Class 7
c is the correct answer
Ans 9:
Class : Class 7
a is the correct answer because chemical composition dose not change
Ans 10:
Class : Class 7
A is correct because it just turns hard but it is still clay only.And also chemical change doesn't mean that it is irreversible,Chemical change means that the identity of the substance we started with is lost.Here the identity is not lost.So A is correct.
Ans 11:
Class : Class 6
C because we can get clay back from a wet pot by smashing it,but once it heats up, it dries the clay and makes it stone hard.
Ans 12:
Class : Class 4
Ans 13:
Class : Class 6
Ans 14:
Class : Class 9
C,because- it is a chemical change. after baking we can break it into smaller particles but it won't form the same clay, with same properties again
Ans 15:
Class : Class 6
Yes ,Because chemical means change in the properties but there is no change .The answer is A