The changes which cannot be reversed even by changing the conditions is called____________.
reversible changes
irreversible changes
desirable changes
undesirable changes
In a ________ ,only physical properties of the substances change.
physical change
chemical change
endothermic change
exothermic change
The changes which are brought and controlled by man are called__________.
Natural Changes
Man-made changes
Fast change
desirable change
The changes which occur within a very short time are called____________.
Natural changes
Fast changes
Slow changes
