Blog tasks
The whole report must be posted to your group blog.
Make sure you include:
1. A table of
results.
2. The type of
bonding present in each substance.
3. A secondary
table to show “expected” results. (Research the type of bonding and the
expected results for the test that you carried out)
4. A conclusion
comparing the actual results with the expected results.
5. An evaluation
that suggest improvements that could be made to your method.
6. A minimum of 2
references (APA format).
Obtained results & Expected results for our components:
For Iron (III) Sulphate , this compound is formed by an ionic bonding, this means that the sulphate steals the electrons that iron wants to lose. By this I mean that Iron, which is a metal and has a flow of electrons which maintains the atoms in place (Magnetic field), sulphate, which is a negative ion, (electronegativity) wants to get, and pulls to it those iron electrons. This will give the compound the characteristics of an ionic compound, and, this means that this material will probably melt at a really high temperature, it will form maybe crystals, could maybe dissolve in water, (water is polar), this means the negative parts from the compounds will go with positive parts from water and, negative parts from water with positive parts of the compound. This compound could maybe conduct electricity, but, there are loads of ionic compound with exceptions, whith some characteristics from this ionic compound but not all, of those which are expected.
For Paraffin CnH2n+2, This compound is formed from methane, made up of atoms of hydrogen and
carbon, which make a covalent bond, a organic covalent bond. This will give the
compound some of the characteristics of covalent bonding, but it is an
exception in the melting point, parafine molecules are really small, this
causes its low melting point (70 degrees), with other covalent compounds such
as diamonds which really large covalent molecules, it melting point is much
higher. This compound will not dissolve in water because water is polar, and
covalent bonding is neutral, I mean, don´t want to gain, or loose electrons, by
the way it won’t conduct electricity, because their outer shells are with the
perfect electron charge, and molecules won´t have a negative or positive parts, they have their charges balanced equally (Neutral), not electronegative.
.
.
For starch, formed from glucose ( C6H12O6) join toguether by covalent bonds, called glucosydic bonds, is formed from carbohydrates hydrogen and oxigen. Giant Covalent molecule. This is an organic compund, this means that we cannot melt it, because, it has energy, this means that if we put starch at high temperatures it will just burn the energy it has (combustion). It is not soluble in water because of the sizes of the molecules, its a powder so, you can remove and make all the particles movein water, but waiting like 2 minutes the powder goes to the bottom, as I said starch molecules have really big sizes and this makes water molecules cannot surround them. It won’t conduct electricity, because their outer shells are with the perfect electron charge, and molecules won´t have a negative or positive parts, they have their charges balanced equally (Neutral), not electronegative..
For iron nails, formed from iron, have metal characteristics, very strong bonding between its atoms, this bond is really hard, making it, insoluble, with high melting point, and conduct electricity, the metallic bond is basically the atoms, and a sea of electrons, this sea keeps all in order, and for breaking this bond it is nessesary loads of energy, energy that water, or low tempertures dont have. Metals conduct electricity because of the sea of electrons constandly moving around.
Conclusion
The results that we have obtained from the
experiment, we have compared it into the result that we should have obtained
and it shows that:
·
The expected results are nearly
the same as the results of our experiment so that means that we have carried successfully
the experiment.
Also it shows us that the results are not very specific so we can´t really say that the expected results are nearly the same as our results because we had not measure correctly the melting point of the substance and the results are not very especific. In the melting point we tried to see if the melting point of different substances to see if they have a low melting point and if we see that the substance was not melting correctly we supossed that it have a high melting point.
Evaluation
Some improvements that can be made to the
method could be:
·
The method says that only with
one attempt we can carry the experiment, but if we carry more times the
experiment, we will have more results to compare them and see if there was an
abnormality in the experiment.
The method also shows that for calculate the melting point we have to heat up the test tube with a bouncer burnerbut it doesn´t show how to heat it, if gentenly or more arresively or heat it in the botton or in the middle or in which part.
Another improvements that can be made in the method are the quantity of the substance that is used in the experiment, because it could be that if one substance have more quantities the properties could change like if we have 1L and 10L of water, the 10L of water take more time to boil even if the two substances are heat up at the same temperature because you need more energy to boil because there is more substance.
Also to measure the melting point, we didn´t use any measuring table, mechanism or tool and we like "invented the result" by looking how more time does it take to burn or how quickly, the best idea to make an improvements is to be measured with the correct tools and with a renew method.
Another improvements that can be made in the method are the quantity of the substance that is used in the experiment, because it could be that if one substance have more quantities the properties could change like if we have 1L and 10L of water, the 10L of water take more time to boil even if the two substances are heat up at the same temperature because you need more energy to boil because there is more substance.
Also to measure the melting point, we didn´t use any measuring table, mechanism or tool and we like "invented the result" by looking how more time does it take to burn or how quickly, the best idea to make an improvements is to be measured with the correct tools and with a renew method.
CHEMWIKI.UCDAVIS.EDU
Covalent Bonds - Chemwiki
- Website
HYPERPHYSICS.PHY-ASTR.GSU.EDU
Sugars
