1. Tuesday, 9/12 Day 2 2- Fill out your Agenda. Science Starter:
1. Please have these
Items on your desk.
Lab
Ticket
Science Starters
Sheet
Science notebook
Agenda
2- Fill out your Agenda.
Science Starter:
Mixture- Two or more substances that are mixed together but not chemically combined.
Solution- A well-mixed mixture containing a solvent and at least one solute that has the same properties through out.

2. Substances
Matter that has the same composition and properties throughout is called a substance.
When different elements combine, other substances are formed.

3. Contains only one particle Can exist in 3 states of matter
Substances Continued
Contains only one particle
Can exist in 3 states of matter
Can be elements or compounds
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4. Compounds
A compound is a substance whose smallest unit is made up of atoms of more than one element bonded together.
Compounds often have properties that are different from the elements that make them up.
Examples: Water, salt, sugar

5. Compounds Have Formulas
H20 is the chemical formula for water, and H2O2 is the formula for hydrogen peroxide.
The formula tells you which elements make up a compound as well as how many atoms of each element are present.

6. How to read a formula
H20
This is a subscript. It tells us how many atoms of that element exist in one unit of that compound.
Hydrogen is made of 2 H atoms and 1 O atom.
No subscript is used when only one atom of an element is present.

7. Let’s try it… Sulfuric Acid H2SO4 Hydrogen Peroxide H2O2 2 Hydrogen
4 Oxygen
Hydrogen Peroxide H2O2
2 Oxygen

8. And some more formulas…
Carbon Dioxide CO2
1 Carbon
2 Oxygen
Carbon Monoxide CO
1 Oxygen
Calcium Carbonate (Found in shells, eggshells, antacid) CaCO3
1 Calcium
3 Oxygen

9. Homogeneous mixtures Examples: Air Solutions (salt water) Alloys
Evenly distributed particles
Particles NOT visible
The prefix: "homo"- indicates the same
Have the same uniform appearance and composition throughout
Examples:
Air Solutions (salt water) Alloys

10. are homogeneous mixtures
Solutions
SOLUTIONS-
are homogeneous mixtures

11. What is a solution? A solution is a mixture of two or more substances.
At least two substances must be mixed, in order to have a solution

12. A solution has two parts
The substance in the smallest amount and the one that DISSOLVES is called the SOLUTE
The substance in the larger amount is called the SOLVENT - it does the dissolving
IN most common instances water is the solvent
                        

13. Examples of solutions
Salt water
Clean Air
Vinegar

14. Heterogeneous mixtures
Visibly different parts
The prefix: "hetero"- indicates difference
Examples:
Salt and pepper
Rice
Soup
Pizza
Sulfur and iron

15. A SUSPENSION is a heterogeneous mixture of large particles
These particles are visible and will settle out on standing
Examples of suspensions are: fine sand or silt in water or Italian salad dressing
Suspensions

16. Compounds vs Mixtures Mixtures Compounds Not chemically combined
Combine chemically forming molecules
Can combine in any proportion
Combine in set proportions
Separated physically
Separated chemically