By: Toni and TaahirThere are six chemical
reactions.
Combustion is when oxygen combines with another
compound to create water and carbon dioxide, this reaction is considered to be
exothermic which simply means that this reaction creates heat.
Synthesis this reaction is when two or more
simple compounds come together in order to create a complicated compound.
Decomposition is the complete opposite of synthesis,
this occurs when a molecule that is complex breaks down into simpler molecules.
Single displacement is when one element trades places with
another element while in a compound.
Double displacement is when the anions and cations of two
different molecules switch places, which then turns into two complete different
compounds.
Acid-Base is a certain kind of double displacement
reaction that happens when a acid and base react with one another. The H+ion in
the acid reacts with the OH ion in the base.
Some
experiments that have been
conducted by us are mixing potassium promaginite and glycerin
that causes an exothermic reaction. Based on the six different types of
Chemical reactions which type of chemical reaction does this experiment give?
Another experiment example: Sodium
and water in chlorine gas which produces a lot of heat but it also
turns into sodium chloride which is just common salt. What reaction does it
give?
A
third example is when Helium is
cooled to -271 degrees Celsius. It is called lambda point. Once it hits this
point it is considered helium II or helium superfluid.
What
reaction is this?
Try to balance equations here and testing reactions here: http://phet.colorado.edu/en/simulation/reactants-products-and-leftovers
Resources:
http://edtech2.boisestate.edu/halej/573/jigsaw2.html
http://antoine.frostburg.edu/chem/senese/101/thermo/faq/exothermic-endothermic-examples.shtml
Things that affect Reaction are
AGITATION: Anything that cause particles to move, shaking and stirring are actions that result in the movement of particles. This leads to more collisions, and a higher reaction rate.
CATALYST: Is something that helps initiate a reaction, but isn't considered a reactant or a product. It increases the rate at which chemical reactions can occur. The catalyst is not depleted during the reaction.
CONCENTRATION:
When there are more particles in a given volume, the amount of times these particles will collide is greater when the are less particles. The more particles/less space per volume, the faster the reaction will occur.
PRESSURE: The higher the pressure there is on a container, the lower the volume will be (less space, which leads to more collision and more often), which will also increase the speed of the reaction.
SURFACE AREA: The amount of particles found on the surface of that are open to collision. Larger objects have surfaces with particles that are less exposed, which means fewer collisions. Objects that are smaller have more particles in contact with a surface, which would allow for more collisions to occur. Chemical reactions occur at a higher rate when their reactants cover more surface area.
