You light up my life

1. You light up my life conductivity

2. Chem Catalyst • If you were to drop a spoonful of salt (NaCl) into a glass of water, what would the salt dissolve? Would a gold ring that is dropped into a glass of water Dissolve? • Why do these substance react so differently to water?

3. The Big Question • What patterns do we see in the properties of substances? Unit 1 • Investigation V

4. You will be able to: • Predict whether MgSO4(aq), epsom salts, will conduct electricity. Unit 1 • Investigation V

5. Build conductivity meters • We use Christmas Tree lights with wires to form a conductivity meter

6. (cont.) (cont.) Unit 1 • Investigation V

7. Intro to electricity • What is a circuit? • Open vs closed circuit • Short Circuit

8. Demonstration of dissolving and conductivity Test to see if Kool-Aid will dissolve and/or conduct electricity Both solid and solution (if applicable)

9. Revisit Mixtures and Substance change Amount of Solubility Homogeneous (H): Uniform Solution, can not determine separate ingredients Heterogeneous (He): Can determine ingredients, but some mixing occurs Immiscible (I): no mixing of ingredients at all When water was added to create a solution: Was there a: Physical change (P) (no chemical reaction) Chemical change (C) (chemical reaction)

10. Activity • Purpose: This lesson allows you to collect evidence regarding some of the properties of substances, and look for patterns. (cont.) Unit 1 • Investigation V

11. Lab set up • Form groups • Make sure each member has their own copy of all handouts • There are a number of stations around the room, groups will be rotating through them • Groups will take their conductivity test equipment with them as they move through the stations

12. Procedures to take at the stations • Do not leave the conductivity meter connected in circuit too long. These Christmas light burn out very fast • Do not connect wire to both ends of battery, creating a short (dangerous). This burns out the batteries extremely fast. Points will be deducted from group score for lab if this occurs • Once you test the materials at a station take paper clips off of beaker and dry them off. Separate all material • Do not place paper clips used to test one material or solution into a different one, (minimize Contamination)

13. Extra Lab Precautions • Be aware about special conditions for the following materials: • Ethanol (strong smelling) • Calcium Chloride Solution (can damage paper clip, stain clothes) • Copper Sulfate solution (can damage paper clip)

14. Before you perform experiments • Make predictions as a group

15. The solvent will be water for each solution

16. When Done • Answer questions based on lab with your partner(s) • Make sure your have cleaned up after yourself • Question and answer session will follow

18. Most objects can be sorted into one of 4 categories: Whether it dissolves or not Whether it conducts or not

19. Notes Dissolves Yes No Conducts Conducts Yes No Yes No Unit 1 • Investigation V

21. Wrap-Up • Not all substances conduct electricity. • Substances that do conduct electricity involve either solid metals, or metal-nonmetal compounds dissolved in water. • Not all substances dissolve in water. Unit 1 • Investigation V