1. Color of Ions Lab

2. Visible Light A type of electromagnetic radiation
Found on the electromagnetic spectrum
The visible region is found in l from nm
ROYGBIV

4. Visible Light
In order for a compound to have color, it must absorb visible light

5. Visible Light
The energy of electrons is quanitized which means they only exist at certain energy levels separated by specific intervals

6. Visible Light
When atoms absorb energy in the form of electromagnetic radiation electrons jump to higher energy levels

7. Visible Light
Then when they drop back down, they give off the energy in the form of electromagnetic radiation

8. Visible Light
The energy difference between levels will predict what type of electromagnetic radiation so if a compound will absorbs visible light

10. Visible Light
Because the energy level changes for the electrons of a particular atom are always the same, they can be identified by absorbtion spectra

12. Visible Light
When a sample absorbs visible light, the color we perceive is the sum of the remaining colors that are reflected by an object

14. Compounds and Color
For ions of Group I, II, and III, the energy difference is greater than the energy of visible light, so they are colorless.

15. Compounds and Color
For most transition metal ions, the energy difference is much smaller, and these ions absorb visible light, so they have color

16. Compounds and Color
Chloride, sulfate, and nitrate anions are all colorless, so their compounds are white.

17. Compounds and Color
For the transition elements, the existence of colored cations is as characteristic as their different charges

18. Discussion
Explain why some compounds are colored and others are colorless
Define visible light
What happens when an element gives off color
Why are transition elements colored and groups 1A, 2A, and 3A colorless?