which of the following will result in a chemical change?A.melting ice to obtain water B.evaporating alcohol into vapor.C.drying wood in ashed D.burning coal in a furnace
Melting, drying, evaporating are physical changes. The only chemical change you have listed is burning coal.
To determine which option will result in a chemical change, we need to understand the concept of a chemical change. A chemical change, also known as a chemical reaction, occurs when the arrangement of atoms in a substance is altered, resulting in the formation of a new substance with different properties.
Let's analyze each option:
A. Melting ice to obtain water: This is a physical change, not a chemical change. Melting is the phase transition from solid to liquid, where the bonds between water molecules are simply broken, but the chemical composition of water remains the same.
B. Evaporating alcohol into vapor: Again, this is a physical change. Evaporation is the phase transition from liquid to gas, where alcohol molecules change their arrangement, but their chemical composition remains unchanged.
C. Drying wood in ashes: Drying wood is also a physical change. It involves removing the water content present in the wood, but it doesn't involve any chemical reactions.
D. Burning coal in a furnace: This option involves burning coal, which is a chemical change. Burning coal is a combustion reaction, where coal reacts with oxygen to produce carbon dioxide, water, and release energy in the form of heat and light. The chemical composition of the coal changes during the burning process.
Therefore, the correct answer is D. Burning coal in a furnace will result in a chemical change.