experiment 1 Flashcards
Sunlight is a mixture of different kinds of ______
light
When sunlight passes thru a ______, it separates into a rainbow of colors called _______ spectrum
prism
continuous
What happens when heat is applied to an electron
goes to excited state
What happens when electron goes back to its ground state
release of heat/photons
Why do electrons go back to their original states
Because of unstability
Flame Colour for each element:
Cu2+
intense green
Flame Colour for each element:
K+
dull violet
Flame Colour for each element:
Ca2+
intense red
Flame Colour for each element:
Na+
intense yellow
Flame Colour for each element:
Ba2+
yellow green
Why do elements exhibit different colors when heated
Different elements have different electron configurations, so the energy levels and the corresponding wavelengths of light emitted will vary
Importance of avoiding yellow flame in flame tests
BLUE needed
more evident display of color = color can be clearly seen in blue flame
+ blue = one of the highest energy emitted in the spectrum -> helps raise the electron to their highest states
Can the flame test be used to determine the identities of unknown samples in a mixture?
- when multiple ions are present, colors may blend or be overlapped
- faint color producers
