HOW CAN I DETERMINE A METAL FROM A NON METAL? WILL THERE BE DIFFERENCES IN INTRINSIC AND EXTRINSIC PROPERTIES? EXPLAIN IN AT LEAST 3 SENTENCES Warm-up

Unit 1 Investigation V  A chemical bond is an attraction between atoms that holds them together in space. Notes

Unit 1 Investigation V  Atoms which are connected into many identical units are called molecules. They units may be composed of only two atoms or of dozens of atoms. (cont.) Notes (cont.)

Unit 1 Investigation V Model 1: IONIC Properties: Made of metal and non-metal atoms Dissolves in water Conducts electricity when dissolved but not when solid Brittle solids Description of drawing: Spheres without gray areas represent metal atoms. Spheres with gray areas are non-metal atoms. Metal atoms “give up” their valence electrons to non-metal atoms. Notes (cont.)

Unit 1 Investigation V Model 2: COVALENT NETWORK Properties: Made entirely of nonmetal atoms Does not dissolve in water Does not conduct electricity Very hard solids Description of drawing: Valence electrons connect atoms with each other in all directions – like a grid or network. (cont.) Notes (cont.)

Unit 1 Investigation V Model 3: METALLIC Properties: Made entirely of metal atoms Do not dissolve in water Conduct electricity Bendable solids Description of drawing: Valence electrons are free to move throughout the substance like a “sea” of electrons. (cont.) Notes (cont.)

Unit 1 Investigation V Model 4: MOLECULAR COVALENT Properties: Made of nonmetal atoms Some dissolve in water, some do not Do not conduct electricity Tend to be liquids or gases or softer solids Description of drawing: Valence electrons are shared between some atoms. This creates small stable units within the substance. (cont.) Notes (cont.)

Unit 1 Investigation V Ionic Covalent Network Metallic Molecular Covalent (cont.)

Warm-up Explain the 4 bond types and how I can tell the difference between each. Must be at least 4 sentences!

Unit 1 Investigation V PredictionsTest Results Statio n SubstancesConduct ? Yes/No Dissolve ? Yes/No Conduct? Yes/No Dissolve? Yes/No Conduct when wet? 1H 2 O(l), waterN/A 1Al(s), foil aluminum 2C 20 H 42 (s), paraffin (wax) 3CaCl 2 (s), calcium chloride 4C 12 H 22 O 11 (s), sucrose (sugar) 5NaCl(s), salt, sodium chloride 6CuSO 4 (s), copper sulfate 7Cu(s), copper 8SiO 2 (s), sand, silicon dioxide Make this chart on the left side of your journal

Bonding Lab- Due Friday Introduction- What are we testing for? Purpose- To determine the bonding type of substances based on whether they can conduct electricity and/or be dissolved in water. Include your predictions from your chart Create your own hypothesis! Materials and Procedure (use your chart to help you with materials!) Data- this is your chart! Analysis- What does your chart state. Create a flow chart as your graph- explain what you see in your flow chart Conclusion- Did you prove your hypothesis? What characteristics determine which bond? (use your notes) Classify each of the substances into a bonding type. Did you have any trouble while conducting the experiment? How could we improve our experiment?

3-2-1 and Foldable Read pgs INDIVIDUALLY! For each section (they are numbered) complete a  3= three things you learned  2= 2 questions you have  1= a ten word summary When you are done- create a foldable of the 4 types of bonding  Name of Bonding type  Picture  Characteristics of Bond (there should be 4 of each)