A change in the mass of specific substances can takeplace in _____ change.
Chemical
Physical
Both a & b
None of these
Which depend on the composition or change in composition of a substance?
physical properties
Chemical properties
Density
Melting point
Conversion of milk to curd is a _________ change
Reaction between iodine and phosphorous is taken place by which method?
Heating
Mixing
Light
Electricity
Which change is temporary and easily reversible?
Permanent
Irreversible
Which can be determined by simple physical observations and measured without changing the composition of the substance?
Physical properties
Chemicalpropertics
Composition
Concentration
Energy is either absorbed or evolved during ________________ change.
Temporary
Reversible
Which change is permanent not easiliy reversible?
Burning of candle is ____ change.
Both a and b
Freezing of liquids to solids is a _____________ change