which one of the following will result in a chemical change?
a. melting ice to obtain water
b. evaporating alcohol into vapor
c. drying wood in a shed
d. burning coal in a furnace
2006-06-25 01:53:17 · 7 answers · asked by babydoll53175 2 in Science & Mathematics ➔ Physics
d
2006-06-25 01:55:45 · answer #1 · answered by finesthaitian 3 · 0⤊ 1⤋
The only process out of the 4 listed which involves a chemical change is (d), burning coal in a furnace.....combustion.
The remaining 3 processes involve physical changes to the substance(s).
A change in state is a physical change, it leaves the chemical structure of the substance intact. Ice melting into liquid water, water evaporating off of wood, alcohol evaporating.....all a physical change.
Coal burning in a furnace is a combustion reaction, changing the Hydrocarbons in the coal into Carbon Dioxide, water, and other byproducts.
2006-06-25 10:01:28 · answer #2 · answered by mrjeffy321 7 · 0⤊ 0⤋
i thk the 4 processes will result in a chemical change
A. melting ice to obtain water
electro-statics forces of attraction present are broken
change in lattice energy
there is energy changes also
b. evaporating alcohol into vapor
again there r bonds present in alchol which r broken n thus energy change
c. drying wood in a shed
burning of wood in oxygen ( combustion)
carbon dioxide present n also several compounds formed energy changes....i.e enthalpy changes
d. burning coal in a furnace
production of CO2 or CO
2006-06-25 09:11:33 · answer #3 · answered by charmed_deenesh 1 · 0⤊ 0⤋
on burning a coal its chemical composition changes therefore the ans is D
2006-06-25 08:57:38 · answer #4 · answered by aashg 2 · 0⤊ 0⤋
d - the process of combustion
2006-06-25 09:02:26 · answer #5 · answered by Anonymous · 0⤊ 0⤋
d
2006-06-25 09:42:27 · answer #6 · answered by Suganya 2 · 0⤊ 0⤋
i think B.
2006-06-25 08:58:18 · answer #7 · answered by Anonymous · 0⤊ 0⤋