In class Friday we went over the liquids and solids observed in a lab on Thursday. As a class we decided which substance was compound which was an element and which substance was a mixture. After everyone went up and wrote substance under where they thought it belonged we all went through to check each-others answers. This is what we ended up with:
In the table below the numbers next to the letters underneath "symbols/formlas" are meant to be down lower and smaller-like in this image-
-over 3 parts in your book you read as homework
-your chart in the packet
-and the 2 sets of notes
- pure substance (simplest)
- can't be divided
- no "+"'s in formula
- and has only one chemical symbol
- pure substance
- 2 or more elements combined chemically
- has a ratio (always the same)
- ONE chemical formula
- 2 or more elements involved
- NOT CHEMICALLY combined
- 2 or more chemical formulas
- formulas have "+"'s
TYPES OF MIXTURES:
Homogeneous- uniform mixture, same throughout
Ex.cedvita, mineral water, salt water
Heterogeneous-not uniformed mixture, not same throughout
(Looks like a salad. You can tell where the tomato is, where the lettuce is, where the cucumber is; it all stands out)
Solution is a homogeneous mixture.
-Solute(what you have less of): part that dissolves
-Solvent(what you have more of, and usually a liquid): dissolving part
In salt water:
In mineral water-
Stated by Ms. D, "96% of the time H2O is the solvent"
ONE LETTER ELEMENTS:
TWO LETTER ELEMENTS:
THREE LETTER ELEMENTS:
And these are all, man-made solids, and last less than a second usually.
¬We also figured out how to read the substances formulas' using math.
In the formula above there are 4 hydrogens, because you multiply H x 3 and you get 3 hydrogens. Then add the H at the beginning. and you get a total of 4.
There are also 2 carbons and 2 oxygens used to create the substance.
In case you want to look up more formulas, this is a cool site I used:
Next scriber is Severyn.