Question

when two substance are brought in contact there may be a physical or a chemical changes depending on the condition. Give two examples to prove this statement
plsssss

Answer 1

For example,Fire is in contact with Paper,It's a chemical change here but if Paper is contacted with water,It's a physical change,Here,Because the Paper can be dried again,But chemical change is irreversible because burned paper can't get in its original form.

Answer 2

IF ICE IS IN CONTACT WITH ANY SOLID THEN THERE WILL BE A CHANGE IN STATE AND TEMPERATURE.
CHANGE OF MILK INTO CURD