1. 5.1- Compounds and Molecules I can: -explain atoms may be bonded together by losing, gaining or sharing electrons to form molecules or three-dimensional lattices -recognize that the force of attraction among oppositely charged ions is three-dimensional and results in the formation of a three-dimensional lattice

2. Quarts, salt, sugar… Similarities and differences result from ways their atoms or ions are joined.

3. Compound Review Made of two elements Chemical properties very different than original ingredients.  https://www.youtube.com/watch?v=oZdQJi-UwYs https://www.youtube.com/watch?v=oZdQJi-UwYs

4. Chemical bonds distinguish compounds from mixtures Compound v. mixture? Chemical bond: the attractive force that holds atoms or ions together. Blue and Yellow paint=  What if you add more of one color? Hydrogen gas and oxygen gas=  Bonds are broken and atom are rearranged. A compound always has the same chemical formula  NaCl, H 2 0, C 6 H 12 O 6  Same elements in same proportions.  This is true on Earth, outer space, or in your own body.

5. Chemical structure shows the bonding within a compound. How things connect= chemical structure Chemical Structure: the arrangement of atoms in a substance.  Compound=Rope Two terms to specify position of atoms  Bond length: the average distance between nuclei of two bonded atoms  Bond angle: the angle formed by two bonds of the same atom.

6. Models of Compounds Ball and Stick (previous slide) Structural Formula Space Filling

7. Compounds with network structures are strong solids. Quarts Compound…  Every silicon atom is bonded to four oxygen atoms.  Hard and inflexible.  Takes a lot of energy to break making melting point and boiling point very high.

8. Some compounds are made of networks of bonded ions. Sodium Chloride, salt (ionic compound)  Tightly packed positive sodium ion and negative charged chloride ions.  Formed by a transfer of electrons.  Cations and Anions  Typically form between metal and nonmetal.

9. Some compounds are made of molecules Sugar (molecular compound)  Made of molecules of carbon, hydrogen, and oxygen atoms joined by bonds.  Two or more nonmetals share valence electrons to get a full outer shell.  Bonds are not as strong resulting in lower melting points.

10. Testing the attraction Bonds  Solids=strongest  Liquid=middle  Gas=weakest Quick lab: What melts more easily, sugar or salt.

11. Hydrogen Bonds One water molecule is attracted to a hydrogen atom of a neighboring water molecule. Dotted lines indicate intermolecular attractions… hydrogen bonding.