Show:
Activity #22 + 23
Activity#24
Activity#25
Activity#26
Activity#27/All
100
What was the process called that we used to make our circuit boards
Etching
100
What did we perform a serial dilution on? a.) 100,000ppm copper chloride b.) ammonia c.) used etching solution d.) sodium hydrogen phosphate
a
100
A chemical reaction changes what into what? Hint- what is the term for initial substances and what is the term for final substances.
It changes reactants into products.
100
Where did the copper containing waste end up after the process of incineration?
The ashes, definitely not the smoke
100
In activity #27, we looked at a third method for treating waste. What was this process we used in activity #27 and what does it mean?
Reclaiming- it means to recycle, reuse or get it back so we can use it again
200
What is in the etching solution that makes it so hazardous?
copper
200
What did we add to test for the presence of copper?
Ammonia
200
What happens to the total mass of a chemical reaction in an open system and in an a close system and WHY
In an open it decreases because some matter escapes and in a close it stays the same because no matter escapes
200
What did the green paper represent? Why was it significant?
It represented the copper containing waste or used etching solution
200
Which activity represented -Disposal -The Manufacturing Process -Recycling Options Act#23- producing circuit boards Act#25- Incineration Act#27- Reclaiming
Disposal- #25 Manufacturing- #23 Recycling- #27
300
Where did the copper from the circuit boards go after it was soaked in the etching solution? a.) to the mall b.) from the etching solution to the board c.) from the board into the etching solution
c
300
Was dilution a reasonable method to dispose of our used etching solution? Why or why not?
No, because it is way too much water 26,000 gallons 99,999 liters
300
In a closed system, Why do the reactants have different physical and chemical properties compared to the products after a chemical reaction despite no change in mass?
There is a change in molecular structure. The atoms rearrange but are not gained or lost.
300
What were the 2 reactants and what were the 2 products in the chemical reaction from activity #26
Reactants- fire and paper Products- smoke and ash
300
After adding the metals to reclaim the copper, did we want to see ammonia indicate the presence of copper in the remaining solution
Absolutely not, we wanted a “waste free” solution. We wanted all the metal waste to move from the solution to the washer.
400
True or False Your body needs a small amount of copper to survive
True
400
What did we do in activity #24 “Diluting the Problem” and how did we achieve this?
To determine the concentration of the used etching solution with a serial dilution and comparative analysis
400
Reaction #1 was ____ because it gave off heat while reaction #2 was ________ because it absorbed heat. Endothermic vs exothermic
reaction #1- exothermic reaction #2 endothermic
400
What is the one major advantage of the incineration process?
It reduces the volume of waste… does not eliminate it.
400
If we wanted to determine the concentration of copper remaining after adding the iron washer, what could we have done. Hint- concentration not whether is present or not
Perform a serial dilution and comparative analysis
500
What is an advantage of circuit boards? What is one disadvantage of circuit boards?
Advantage- Reduces amount of wiring needed Disadvantage- produces waste
500
If 100g of water has 50g of lead IN IT, What is the concentration of lead in ppm.
500,000ppm
500
In a closed system, 100grams of reactant #1 are mixed with 300grams of reactant #2. Roughly, how much (in grams) do you estimate will be left in the reaction tube and why?
400 grams because it is a closed system and no matter can escape, nor was not destroyed in the reaction
500
Summarize the “real” process of incineration that we witnessed in the video.
Burned at extreme temps Broken down into basic elements or atoms Cleaned and cooled with water.
500
What were the three ways to treat hazardous waste. Pick one process and give an advantage and a disadvantage
The processes were Dilution, Incineration and Reclaiming Advantages and disadvantages will vary