Today, we performed another minilab, involving the mixing of various chemicals, which included at least three that were very dangerous and/or corrosive to body tissue (ex. NaOH is lye; very caustic).

My picture

My own picture; I also learned that my picture sources don’t show up like they’re supposed to, so I’ll have to type them in these captions hereafter.

Here are the results of those chemicals’ being mixed, read left to right and downwards:

1. FeCl3 + AgNO3: Chunky white splotches, suspended in nearly clear liquid.
2. FeCl3 + Pb(NO3)2: Clear, with fracture-like, parallel lines everywhere.
3. KI + AgNO3: Yellowish-bluish color throughout; opaque.
4. KI + Pb(NO3)2: A very yellow color throughout.
5. NaOH + AgNO3: Chunky brown splotches, suspended in nearly clear liquid.
6. NaOH + Pb(NO3)2: Very cloudy, white.
7. NaOH + CuSO4: Dark  blue color with clear liquid surrounding.
8. NaOH + MgSO4: Almost clear with nothing else.
9. NaOH + FeCl3: Copper colored swirls suspended in orange-brown liquid.
10. Na2CO3 + AgNO3: Light yellow-green color, with grainy-looking texture.
11. Na2CO3 + Pb(NO3)2: Cloudy and white.
12. Na2CO3 + CuSO4: Grainy-looking, deep blue color.
13. Na2CO3 + MgSO4:Almost clear with nothing else.
14. Na2CO3 + FeCl3: Copper-colored swirls in very cloudy, brown liquid.
15. Na3PO4 + AgNO3: Light yellow-green color, with grainy-looking texture.
16. Na3PO4 + Pb(NO3)2: Cloudy and white with little else.
17. Na3PO4 + CuSO4: A slightly lighter blue color than the other two blue-colored reactions, with grainy-looking texture.
18. Na3PO4 + MgSO4: Slightly white and cloudy.
19. Na3PO4 + FeCl3: Tiny, white specks suspended in a very milky/opaque liquid.

There are all those subscripts and parentheses because compounds must have a neutral electric charge, and so the number of elements in a compound must change depending on the charge of the initial molecules. Those charges would be written as He- or Fe3+, but as a superscript.
You can also see patterns in the grid of chemical reactions, formed because each chemical reaction produces precipitants that may share one type of element or molecule with another compound in the grid, and so have similar properties like color or appearance.

Not much else to say other than that the precipitants that formed indicated that they were all chemical reactions. And if you didn’t know, to precipitate means “to cause (a substance) to be deposited in solid form from a solution.”