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Which set of procedures and observations indicates a chemical change?
a: ethanol is added to an empty beaker and the ethanol eventually disappears
b: a solid is gently heated in a crucible and the solid slowly turns to liquid
c: large crystals are crushed with a mortar and pestle and become powder
d: a cool, shiny metal is added to water in a beaker and rapid bubbling occurs
e: a liquid is placed on a hot plate and the temperature rises
Which is a chemical change and why? I chose a but it's wrong. I'm almost positive it's not b or c.
d (bubbles indicate a chemical reaction occurred)
In : a this is a physical change (evaporation; going from liguid to gas phase)
In: b melting is a physical change
In: c this is a physical change from large crystals to finer crystals (power)
In: e temp rises due to heat from the hot plate.