BONUS! 500 points!
What charge does an anion have?
Negative!
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.
BONUS 500 points!
What happens when you mix yeast with hydrogen peroxide?
Bubbles and overflows, gives off heat as an exothermic reaction is occurring!
How do we know which method of separation to use?
Depends on the physical characteristics of a mixture.
BONUS 500 points!
Define a "reversible reaction."
The conversion of reactants to products occurs simultaneously with the conversion of products to reactants
What charge does the cathode have?
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.
BONUS 500 points!
Give the steps of the scientific method.
1. Research
2. Ask a question
3. Hypothesize
4. Experiment
5. Analyze/conclude
Name 4 methods of separation
Filtration, evaporation, distillation, chromatography, centrifugation
Define "filtrate" and "feed"
Filtrate: liquid that has already passed through the filter.
Feed: liquid before it passes through the filter.
What is an electrolyte?
A liquid that can conduct electricity
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)
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.
Give a solution that you would separate via evaporation.
Salt water
Define electrolysis
The splitting of a substance through electrons.
During electrolysis, which loses mass-- the anode or the cathode?
The anode loses mass! The cathode gains mass!
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.
Describe the experiment we did to demonstrate the terms "endothermic" and "exothermic".
Define "centrifugation"
A method of separating molecules with different densities, by spinning them around an axis.
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.
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.
Write on the board the chemical equation for how carbonation is made.
H2O + CO2 → H2CO3
Lighter.
What is "dynamic equilibrium"?
The conversion rate of reactants to products and products to reactants is equal. An example of homeostasis.