1. Elements, Compounds and Mixtures
Katina Peck

2. 3 categories of matter
Elements
Compounds
Mixtures
H2O
Pizza Cu

3. Elements Elements are the building blocks of matter.
Everything in the Universe is made from about 118 elements. Cu
Each element is made up of the same type of atoms.

4. Compounds Compounds are made up of two or more different elements.
Compounds have different properties than the elements that make it up.

5. Compounds H2O Each compound is represented by a formula.
H2O= 2 Hydrogen & 1 Oxygen, 2:1
CO2= 1 Carbon & 2 Oxygen, 1:2
NaCl= 1 Sodium & 1 Chlorine 1:1
Chemically combined in a specific ratio.

6. compounds Formulas are made of the symbols and a subscript number.
The subscript is the number of atoms of that element.
A coefficient tells us how many molecules
there are.
compounds
Subscript
Coefficient

7. Mixture Most of the matter in the Universe is a compound or a mixture.
A mixture is made of two or more substances that are not chemically combined.
Substances in a mixture retain their properties.

8. Mixture Two types of mixtures: Heterogeneous
Substances in the mixture are easily distinguished.
Pizza, trail mix, Italian salad dressing
Homogeneous
Two or more substances are uniformly mixed.
Salt water, the air we breath, soft drinks
Heterogeneous
Homogeneous

9. Molecule
A molecule is formed when two or more atoms join together chemically.
If the molecule is made of two atoms of the same element, it is called a diatomic atom.
Di- two
Atomic- atom
Two atoms H2 O2

10. Comparison
A molecule is formed when two or more atoms join together chemically.
A compound contains at least two different elements.
All compounds are elements, but not all elements are compounds.

11. Solution A homogeneous mixture. Solute- the substance being dissolved.
Solvent- the substance that dissolves a solute.
Solubility- the amount of solute that will dissolve in a solvent.
Solvent
Solution
Solute
Solute

12. Colloids A heterogeneous mixture that never settles. Example: Milk
Scatters light

13. Suspension A heterogeneous mixture that has particles that settle.
Example: Italian salad dressing