Question

which of the following processes are chemical change?give reasons. a) making a salt solution b) adding hydrochloric acid to marble stone. c) evaporation of water D) adding phenolphthalein indicator to acid solution e) respiration f) ripening of mango g) breaking of glass

Answer 1

a.) Physical change. Because change is reversible. We can get salt back by evaporation and then water by condensation.
b.) Chemical change. It will effect the molecular properties of marble.
c.) Physical change. Again it is reversible. We can get water back by condensation.
d.) Chemical change. Phenolphthalien loses in ions in an acid. So it affects is composition.
e.) Physical change. Because during respiration there is no change in our physical properties in the body.
f.) Chemical change. As when a ripening of mango occurs we can't get the fresh manago back. So it affects its chemical properties.
g.) Physical Change. As during breaking of glass no physical properties are changed. Glass remains a glass and form no new compound.

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Answer 2

Answer:

a.) Physical change. Because change is reversible. We can get salt back by evaporation and then water by condensation.

b.) Chemical change. It will effect the molecular properties of marble.

c.) Physical change. Again it is reversible. We can get water back by condensation.

d.) Chemical change. Phenolphthalien loses in ions in an acid. So it affects is composition.

e.) Physical change. Because during respiration there is no change in our physical properties in the body.

f.) Chemical change. As when a ripening of mango occurs we can't get the fresh manago back. So it affects its chemical properties.

g.) Physical Change. As during breaking of glass no physical properties are changed. Glass remains a glass and form no new compound.

Explanation:

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