1. Unit A: 1.3 Matter combines to form different substances
How pure matter and mixed matter are different
How atoms and elements are related
How atoms form compounds

2. Mix 1 teaspoon of each water and cornstarch. Observe.
Can you still see each substance? How different?
Oobleck is formed! NEW substance

3. Matter: Pure or Mixed
Even drinking water is not pure: minerals dissolved in and chemicals added to it
Pure: if a substance contains only a single type of atom (such as gold) OR a single combination of atoms bonded together (such as water)

4. Element
Contains only a single type of atom – cannot be separated into other substances
Ex: silver, oxygen, hydrogen, helium, etc

5. Diamond and graphite are both made of Carbon
Diamond and graphite are both made of Carbon. The individual atoms have the same properties, but are in different arrangement giving the substance very different properties

6. Compounds Two or more different types of atoms bonded together
Water, carbon dioxide, table salt
Individual elements can have very different properties compared to the compound they form
Break down a compound into smallest parts that are still that substance, individual atoms or elements?
No!
Break down a pure element into smallest parts that are still that substance, atoms of that element?
Yes!
If you break a compound into the parts that compose it?
Atoms of the elements that compose it (ex: NaCl)

7. Mixtures Mix of different substances
Sea water: contains water, salt, other minerals
Blood: cells and plasma
Plasma: water, sugar, fat, protein, salts, minerals
Combo of different substance that remain their individual substances and can be separated physically.
Will not always contain the same amount of the various substances
Think fruit salad!

8. Compounds vs Mixtures Mixtures Compounds substances remain the same
new substance formed, atoms bond together
can be separated by physical means
separated by breaking the bonds between atoms
Proportion of diff. substances can vary
-depends on where you sample (unless Homogeneous)
Proportions of diff. substance are fixed
-any sample yields same type and number of atoms