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September 25, 2009
9 Laboratory: Physical and Chemical Changes
Candle: Before the burning of the green candle ther was a white wick, about 20m tall.
During the burning of the candle the green wax melted because
Elecltons in Atoms.
A Waves " *
a: m w _ , nghthtravels through spaceby means of waves. Each wave has a frequency (v), -
wavelength (A). and an amplitude.
Thefigure below represents a light wave. Label the wavelength ahd amplitude. The
will): Nuclear decay & 72 Life Namemw
/ Introduction? Imo'rderno achibvenuplean stability atoms of-isotopesldecay most often by
a decay. The resulting isotope then becomes stable (n/p ratio) or gets closer to nuclear
stability. The time required for an