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

17. Predict Test Results Test results Mixture type (H, He, I )
Change ? P, C, none
Solute Formula
and Name
Conduct?
Conduct
Dissolve
Potassium sulfate (KCl)
Al(s)
C12H22O11(s) Sugar
NaCl(s) Salt
SiO2(s) Sand
C20H42(s)
Parrafin wax
C2H6O(l) Ethanol
Cu(s)
CaCl2(s),
calcium chloride
CuSO4(s),
copper sulfate
Tap Water (mixture)
H2O(l) Distilled

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 NaCl – salt
CuCl2 – calcium chloride
CuSO4 – copper sulfate
H2O – water
C12H22O11 – sugar
C2H6O – ethanol
Au – gold
Cu – copper
Al – aluminum
SiO2 – sand
C20H42 – paraffin
Unit 1 • Investigation V

20. Conducts, dissolves
Conducts, does not dissolve
Dissolves, does not conduct
Does not dissolve or conduct

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