Power machines in factories and vehicles are examples of………………….
a) Combustion
b) Thermal
c) Evaporation
d) combination
Natural gas is more efficient and produces less...
a) Heat
b) Pollution
c) Reaction
d) Evaporation
Changes occur in matter at …………………..
a) Specific time
b) Thermal Reaction
c) All the time
d) continuously
Irreversible changes include…………………
a) Burning of paper
b) Rusting of Iron
c) Corrosion of material
d) all of these
Metal that difficult to oxidize are called ……
a) Weak metals
b) Strong metal
c) Noble metals
d) Ionic metals
