Vocabulary
a tiny piece of matter that is too small to see
atom
What is chromatography?
a way to separate a mixture by passing through a material
What did scientists use the centrifuge for in Break it Down?
They separated the plasma from the solid material in blood.
We are a substance.
False
to mix evenly into a liquid by breaking apart into pieces that are too small to see
dissolve
Draw an example of how the molecules may look if something does not dissolve.
The picture must show molecules separated.
Is gold a mixture or a substance?
Substance
All molecules of one substance are exactly the same.
True
to pull on an object, even without touching it
attract
What would you observe if you put salt or sugar in water?
The salt or sugar would dissolve.
What other ways is chromatography used for?
We learned about this way in Break it Down!
Examples include:
-Gas chromatography was used to separate molecules by size to figure out what was in an ancient stew.
Different molecules have different properties.
True
able to dissolve in water or another liquid
soluble
Draw a picture of how molecules may look if something dissolves.
The molecules must be attached in some way in the diagram.
What did Diego do to show his sister that sugar dissolves in Solving Dissolving?
The properties of a substance are not determines by the properties of its molecules.
False
what you can observe or measure about something that helps you identify or describe it
property
How did we "clean" the penny in class?
We added vinegar + salt to make a mixture.
Vinegar is an acid, and the acid in the vinegar reacts with the salt to remove what chemists call copper oxide which was making your pennies dull.
Size or shape
When the properties of a solid are attracted to the molecules of a liquid, the solid does not dissolve.
False, the solid would dissolve.