2007-03-11 07:50:42 · 4 answers · asked by viktoria y 1 in Science & Mathematics ➔ Chemistry
Burning of a candle involves two kinds of changes;
a. the melting of the wax, and this is a physical change;
b. burning of the thread which is a chemical change.
A physical change is reversible simply by changing the physical environment. In this example, cooling the wax down will bring it back to its original state.
2007-03-11 07:59:20 · answer #1 · answered by azorysky 1 · 0⤊ 0⤋
The candle wax melts, this is a physical change because the wax reforms once heat is removed.
A Chemical change is not reversible unless energy is added to the system.
2007-03-11 14:59:57 · answer #2 · answered by Old guy 124 6 · 0⤊ 0⤋
candle burns and transforms into gas and ash. that is physical change
2007-03-11 14:58:17 · answer #3 · answered by Manz 5 · 0⤊ 1⤋
you see the candle melting.
2007-03-11 14:54:53 · answer #4 · answered by Anonymous · 0⤊ 0⤋