1. Ionic and Molecular Compounds Science 9 – Matter and Chemical Change, Topic 6

2. What is a compound? A pure substance A combination of elements A chemical formula tells you the types and numbers of atoms present. Example: H 2 O has two hydrogen (H) and one oxygen (O) 2 types: – Ionic compounds – Molecular compounds

3. Ionic Compounds A metal paired with a non-metal Ex: NaCl Electrons are transferred from the metal to the non-metal. Na  e-  Cl ____________ becomes more positive and ____________ becomes more negative.

4. Ionic Compounds Metals: – Alkali metals like to transfer 1 electron – Alkaline earth metals like to transfer 2 electrons Non-metals – Halogens like to receive 1 electron – OH likes to receive 1 electron – SO 4 likes to receive 2 electrons – NO 3 likes to receive 1 electron

5. Ionic Compounds Example: Copper likes to give away 2 electrons. How many chlorine atoms will be able to bond to copper? (remember, each chlorine atom receives 1 electron) Answer: – 2 chlorine – CuCl 2

6. Ionic Compounds Practice: – Li and F – Ca and Br – K and I – Ba and Cl – Cs and OH – Be and SO 4 – Mg and OH

7. Do Now! April 3, 2011 Combine the following elements into the correct chemical formula: – Calcium fluoride – Na and OH – Al (3+) and Cl

8. Molecular Compounds A combination of non-metals Ex: H 2 O, CO 2, CCl 4 Some elements bind to themselves to form diatomic molecules The diatomic molecules are: – H 2, O 2, N 2

9. Naming Ionic compounds ex: ZnF Step 1 – Write down the names of both elements » zinc fluorine Step 2 – Change the ending of the 2 nd element to –ide. » zinc fluoride Special rules oxygen  oxidesulfur  sulfide nitrogen  nitridecarbon  carbide boron  boride

10. Naming Molecular compounds CF 4 Follow the steps for naming ionic compounds » carbon fluoride And then… Step 3 – Add a prefix to elements to indicate their number – 1= mono*2=di3=tri4=tetra – *mono is only used for the 2 nd element » carbon tetrafuloride

11. Naming Molecular Compounds Practice – CO – CO 2 – SiO 2 – SO 2 – BCl 3