Physical and Chemical Changes - JSS2 Basic science Past Questions and Answers - page 1
What type of change involves alterations in the physical state or appearance of a substance without changing its chemical composition?
Chemical change
Physical change
Biological change
Environmental change
Which type of change typically involves the formation of new substances with different chemical compositions?
Physical change
Chemical change
Chemical change
Magnetic change
In which type of change are the processes often reversible?
Physical change
Chemical change
Biological change
Geological change
Which type of change is usually irreversible?
Physical change
Chemical change
Thermal change
Electrical change
What kind of changes generally involve the release or absorption of energy?
Physical changes
Chemical changes
Biological changes
Geological changes
What kind of changes generally involve the release or absorption of energy?
Physical changes
Chemical changes
Biological changes
Geological changes
What is the primary characteristic of physical changes?
They involve changes in chemical composition.
They are usually irreversible.
They often involve the release of energy.
They involve alterations in physical properties without changing chemical composition.
What distinguishes chemical changes from physical changes?
Reversibility
Formation of new substances
Involvement of energy release
None of the above
Which type of change involves the breaking and forming of chemical bonds?
Physical change
Chemical change
Biological change
Environmental change
Which type of change often involves phase transitions?
Physical change
Chemical change
Biological change
Geological change