1. Elements and Compounds

2. Elements, Compounds, Mixtures
Explain the relationship between elements, atoms, compounds, and molecules
Determine the number of atoms in a compound based on its chemical formula

3. There are billions of materials in our universe.
Those materials are made up from about 100 elements only.

4. An element is a substance that is made from one kind of atom only
An element is a substance that is made from one kind of atom only. It cannot be broken down into simpler substances.
atom
atom
An element
An element

5. A compound is a substance that is made from more than one element.
atom
atom
A compound made up of 2 different elements
A compound made up of 7 different elements

6. Atom: the simplest building block of matter.
Molecule: a group of atoms joined together with chemical bonds

7. Element: a substance made of one kind of atom.

8. Compound: a substance made up of 2 or more different elements
Compound: a substance made up of 2 or more different elements. Compounds are made of identical molecules.
Glucose
C6H12O6
Water
H2O

9. Mixture : a mix of different atoms and molecules that are not chemically bonded
Salt water
Air

10. Check For Understanding
An element made of atoms
An element made of molecules
A compound made of molecules
A mixture of different atoms and/or molecules

11. Check For Understanding
An element made of atoms
An element made of molecules
A compound made of molecules
A mixture of different atoms and/or molecules

12. Check For Understanding
An element made of atoms
An element made of molecules
A compound made of molecules
A mixture of different atoms and/or molecules

13. Check For Understanding
An element made of atoms
An element made of molecules
A compound made of molecules
A mixture of different atoms and/or molecules

14. Check For Understanding
An element made of atoms
An element made of molecules
A compound made of molecules
A mixture of different atoms and/or molecules

15. Check For Understanding
An element made of atoms
An element made of molecules
A compound made of molecules
A mixture of different atoms and/or molecules

16. Check For Understanding
An element made of atoms
An element made of molecules
A compound made of molecules
A mixture of different atoms and/or molecules

17. Check For Understanding
An element made of atoms
An element made of molecules
A compound made of molecules
A mixture of different atoms and/or molecules

18. Na + Cl  NaCl (table salt)
Compounds have completely different properties than the elements that make them up
Sodium (Na) is a soft, silvery white metal that is highly reactive.
Chlorine (Cl) is a green, poisonous gas
Na + Cl  NaCl (table salt)
Sodium chloride (NaCl) is a white crystal essential for life

19. All compounds have a chemical formula
The formula tells you which elements make up a compound as well as how many atoms of each element are present.
H2O is the chemical formula for water,
H2O2 is the chemical formula for hydrogen peroxide.

20. How to read a formula
H20
This is a subscript. It tells us how many atoms of that element exist in one molecule of that compound.
Water molecules are made of 2 hydrogen atoms and 1 oxygen atom.
No subscript is used when only one atom of an element is present.

21. Check For Understanding
In your notes, determine the number of atoms based on the chemical formula
Sulfuric Acid H2SO4
____ Hydrogen atoms
____ Sulfur atoms
____ Oxygen atoms
Fools Gold (Iron Sulfide) FeS2
____ Iron atoms

22. Calcium Carbonate (chalk, limestone) CaCO3
Carbon Dioxide CO2
________________
Carbon Monoxide CO
Calcium Carbonate (chalk, limestone) CaCO3

23. When you see parenthesis, distribute (multiply) across
Magnesium Sulfate Mg(SO4)2
________________
Ammonium oxide (NH4)2S

24. When you see parenthesis, distribute (multiply) across
Ammonium carbonate (NH4)2CO3
________________
Calcium phosphate Ca3(PO4)2

25. Exit Quiz List all of the elements made of atoms
List all of the elements made of molecules
List all of the compounds made of molecules and provide the number of each kind of atom

26. Compound Review
Compounds are substances with 2 or more elements are chemically combined
Compounds are made of molecules
Compound properties are different from the properties of the elements
Compounds can only be broken down into its elements through a chemical reaction
All compounds have a chemical formula which indicates the ratio of each element