Name the change involved in the burning of coal in blast furnace.
Reversible physical change
Physical at low temperatures and chemical at high temperatures
Chemical change
Irreversible physical change
Coal burns to produce carbon dioxide, water, ashes and energy. A change in which new substances are formed is called a chemical change.
Burning of candle is accompanied by both physical and chemical change. Explain the physical and chemical change involved.
Burning of a coal is a physical change or a chemical change?
Four students have their own opinion about reversible and irreversible changes. Who among the following is correct?
Rohan: Both physical and chemical changes are reversible.
Sam: Both physical and chemical changes are irreversible.
Tom: Physical changes are irreversible and chemical changes are reversible.
Riah: Chemical changes are irreversible and physical changes are reversible