AVOID WEEKEND HOMEWORK...
WATCH TWO VIDEOS...
ONE ON TUESDAY,
AND ONE ON WEDNESDAY
or you can do it the regular way,
one before Thursday
and one before the next class (next Tuesday)
Same routine, watch video + leave a comment
watch the other video + leave a comment for that.
#1: Unit 6: Quantifying Chemical Reactions—Stoichiometry and Moles
#2 Unit 7: The Energy in Chemical Reactions—Thermodynamics and Enthalpy
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ReplyDelete1st video,
ReplyDeleteIt is important to know the limiting reactant so that materials are not waisted, even though all reactions have leftovers you want the better material to be the limiting reactant.
-Laura
*Artificial leaves don't grow on trees* - Video 1
ReplyDeleteEnergy is going to double from what we use today, so its a lot of energy, so we better figure out a new energy source. Their solution was the artificial leaf, which uses the sun’s energy to rearrange the bonds of water into hydrogen and oxygen. It mimics
(H20 + Sunlight —> H2 and O2) the photosynthetic process of water rearrangement to hydrogen and oxygen and contains 2 catalysts that break down H and O. When they are separated, they can be stored and used as fuels, and that is their goal. If they could have hydrogen get converted into a fuel that we use, like gasoline. Making liquid fuel would be a really good thing for the artificial leaf. But, the chemical problem of taking a gas and turning it into a liquid fuel is quite challenging. And so we want to do is take the hydrogen and the oxygen that's created and try and feed it to an organism that is able to convert that into a usable liquid fuel. The organism that the team is hoping to use to produce liquid fuel is called Ralstonia eutropha, a bacteria found in both soil and water. It can convert hydrogen, oxygen and carbon dioxide into both more cells in order to grow, and with a little bit of genetic tinkering, into biofuels. The team has calculated that by using the artificial leaf technology, the amount of water needed to power an average American household for a day is two gallons. All you need is some sunlight, water, and an artificial leaf.
-ƇṐṈṊƢȐ
What I can see in Enthalpy - Video 2
ReplyDeleteWhen you set fire to wood, You are not creating energy, You are converting it from chemical energy too light and heat energy.
Often energy is not the term chemists use to describe the heat. Instead they call the term Enthalpy. We use Enthalpy instead of energy because we are not just interested in the energy being released, But also the effect the energy has on the pressure and the volume of the system that we are studying. Enthalpy takes that affect into account and is defined as the energy Plus the pressure Times the volume (H=U+PV) Chemists can calculate the enthalpy of the chemical reaction by knowing what the reactants and products are in the reaction. To do this we need to know the enthalpy of each bond.
- ℃ΩṈ№℞
DeleteVideo.1.
ReplyDeleteTo quantify chemical
reactions chemists use stoichiometry. Balancing equations, calculating
molecular masses, and figuring out which ingredients will run out first, are all
important tools in the science of stoichiometry.
~Mabel~
2nd video,
ReplyDeleteEnergy is neat her created or destroyed. Work = change in volume + pressure
-ŁÄÙRĀ
(First Video) The use of stoichiometry to define a chemical reaction is important for any problem you are trying to figure out
ReplyDelete- Niles
(Second Video) The first law of Thermodynamics states that energy can neither be created or destroyed, only transferred from one form to another
ReplyDelete- Niles
One way to get energy from hydrogen is to feed it into a fuel cell, like a car.
ReplyDeleteThe comment above is from me, Abigail Miller.
ReplyDelete2nd video: "Understanding how and why energy moves is achieved through the study of thermodynamics." I literally took this straight out of the video.
ReplyDelete~Abigail Miller