OPENER AT TOP OF BLUE SHEET: - RECAPPING THE GOOD & BAD OF SPORT DRINKS Tuesday, Road Salt & Electrolytes

HOMEWORK Please write in your planner: bring in small unopened drink of juice to test TODAY’S OBJECTIVE Students will compare conductivity between sport drinks and stream water containing road salt to identify safe levels of electrolytes in both substances.

 A measure of how a material or fluid can conduct electricity is known as __________________.  A dissolved chemical in blood or water containing salts, acids or bases is known as an __________________. Key Word Recap

What’s The Connection ? Today we’ll compare and what happens what happens to to water quality your blood when when road salt You drink Gatorade floods into a stream Can TOO MUCH of a GOOD THING turn out BAD? Let’s investigate…

The Electrolyte Connection  Please read silently the half sheet article  Complete the follow-up questions by writing in the missing terms from the article

Storms, Road Salt & Streams  Describe on your paper how the 3 pictures relate  After the next rainstorm, what might happen to the electrolyte levels in the stream water? Why?

Real Life Comparisons What electrolytes can do for you What electrolytes can do for you (measured with conductivity in uS/cm) (measured with conductivity in uS/cm) When they’re GOODWhen they’re BAD 0 = distilled water(when testing blood/urine… 200 = your blood level +200 = dangerous levels) 250 = safe drinking water+300 = “hard water” 300 = acceptable stream+500 = polluted stream ?? = your sport drink ?? = your stream sample 2000= lethal injection 2000= lethal injection

So what’s a “safe” electrolyte level? IN WINTER… TO A STREAM, THIS IS A LETHAL INJECTION OF ROAD SALT WASHOFF IN SUMMER… IF LEVELS DROP TOO LOW, THE STREAM GOES ON “IV”

Conductivity Lab Procedure 1. TURN TO BACK OF YOUR LAB SHEET 2. FOLLOW EXAMPLE ON SCREEN 3. TEAMS OF 3 EACH, 1 PER STATION NEW TEAM LEADERS ARE…? NEW TEAM LEADERS ARE…?

Reporting in: What did you discover? 1. Each team leader sends up ONE sample completed chart to show on the screen. completed chart to show on the screen. 2. One member from each team explains results shown on chart 3. Then we’ll move to the CLOSER (on back of the half sheet) (on back of the half sheet)

And tomorrow, we can… Test & compare conductivity of something SAFE you bring in:  Juice or Milk  Your favorite sports drink or soda  NOT cleaning items/household chemicals