Electrolysis
Le Chatelier
Experiments
Separating Mixtures
Vocabulary
100
BONUS! 500 points!
What charge does an anion have?
Negative!
100
On which side of the following reaction would you write "heat" if you knew this was an exothermic reaction?
A+2B⇌C+D
Right side.
100
BONUS 500 points!
What happens when you mix yeast with hydrogen peroxide?
Bubbles and overflows, gives off heat as an exothermic reaction is occurring!
100
How do we know which method of separation to use?
Depends on the physical characteristics of a mixture.
100
BONUS 500 points!
Define a "reversible reaction."
The conversion of reactants to products occurs simultaneously with the conversion of products to reactants
200
What charge does the cathode have?
Negative!
200
Who was Henry Le Chatelier? Give one fact about him.
He was from France, lived from 1850-1937, had 7 children, was a chemistry teacher, very organized and disciplined.
200
BONUS 500 points!
Give the steps of the scientific method.
1. Research
2. Ask a question
3. Hypothesize
4. Experiment
5. Analyze/conclude
200
Name 4 methods of separation
Filtration, evaporation, distillation, chromatography, centrifugation
200
Define "filtrate" and "feed"
Filtrate: liquid that has already passed through the filter.
Feed: liquid before it passes through the filter.
300
What is an electrolyte?
A liquid that can conduct electricity
300
In the following reaction, which side would be "favored" if we increased the concentration of A?
A+2B⇌C+D
The right side (aka products)
300
In our Catalyst experiment, what was the catalyst we used? What signs did we see that showed us it was a catalyst?
Sugar! That cup should have produced more bubbles than the other.
300
Give a solution that you would separate via evaporation.
Salt water
300
Define electrolysis
The splitting of a substance through electrons.
400
During electrolysis, which loses mass-- the anode or the cathode?
The anode loses mass! The cathode gains mass!
400
In the following reaction, which side would be favored if we increased the pressure? And why?
The left side (aka the products). The system will favor the side that produces the least amount of molecules, in order to maintain homeostasis.
400
Describe the experiment we did to demonstrate the terms "endothermic" and "exothermic".
We mixed Epsom salts with water, and yeast with hydrogen peroxide, and measured the temperature of both.
400
Teach the class how distillation works, using a diagram on the board.
Answers vary.
400
Define "centrifugation"
A method of separating molecules with different densities, by spinning them around an axis.
500
What is the purpose of electrolysis? Why would we use it?
Allows us to separate ions from each other by breaking the ionic bond between them.
500
Knowing that the following reaction is endothermic, which side would be favored if we decreased the heat? Why?
6CO2 + 6H2O → C6H12O6 + 6O2
The left side would be favored. The system wants to compensate for the loss of heat by producing more! So we favor the side that produces the heat.
500
Write on the board the chemical equation for how carbonation is made.
H2O + CO2 → H2CO3
500
In chromatography, do lighter or heavier particles travel farthest?
Lighter.
500
What is "dynamic equilibrium"?
The conversion rate of reactants to products and products to reactants is equal. An example of homeostasis.