mahmutovicehhs's posterous

Heat Of Reaction Lab

Research Question

What is the enthalpy when you combine Magnesium and Hydrochloric Acid?

Abstract

We used the calorimeter and added HCL and MG to it we recorded the temperature and figured out what the enthalpy.

Safety

  • Safety glasses

Materials

  • Calorimter
  • 50ml of HCL
  • .2g Mg
  • SPARK

Procedure

  1. Measure out 50 ml HCL
  2. Weigh .2g Mg
  3. Add Hcl to Calorimeter and record temp.
  4. Weigh empty Calorimeter
  5. Add Mg and stir
  6. Record temp every 15 seconds until you can hear the reaction.

 

Evidence

Imag1357

Claim

The Enthalpy when we mixed Magnesium and Hydrochloric Acid after we did the calculations is 387,22.

Scientific Explination

 We needed to weigh and measure the temperature of the calorimeter and other materials to get the Enthalpy of the reaction. The temperature changed as we added the Magnesium and we used those numbers to calculatet he Enthalpy.

 

 

Bio re-newable feedback

My feedback was very helpful and after reading the paper I understood the comments. The feedback mostly focused on the flow of the paper and grammatical issues. However, some suggestions presented were to reconstruct the paper to make it flow.

Things to change:
I will make the paper flow better.
Focus more on one topic instead of a general topic.
I will fix the grammatical errors.
I will go over the citations and correct them.
I will try to reword the paper to allow it to make more sense.

Research question: How are concentration and pH correlated in strong acid/bases and weak acid/bases?

Abstract: We tested the pH of four different chemicals and determined if they were an acid or a base. We made for sets four each chemical and each was diluted by a tenth. The we used pH paper to figure out the pH and this data helped with the [H] and [OH] calculations.

Safety: We used safety goggles and gloves if we wanted to.

Materials

HCL
KOH
Acidic Acid
NH4OH
water
droppers
test tubes
pH paper

Procedure: 

Set up the first solution for each chemical
Diluted the next three by a tenth for all four solutions.
Used pH paper
recorded data
Data:

(download)

Claim: The higher the concentration is the the lower/higher the acid/base pH is and the reverse with a weak acid/base. This then determines concentration of H.

Explanation: The data collected determines [H] because depending on what the data is the [H] will correlated differently with the base concentration.

Colorimetry 2

Title: Can we verify Beer's Law using colorimetry?
 
 
 
Abstract: We conducted the experiment to see what the absorbency of a solution is at a certain concentration.Some of the problems that came up was that the less concentrated the solution the less absorbency it had. We used the water to dilute the solution and the Spark system to measure the absorbency. The overall experiment showed that the lighter the solution the less absorbency and the darker or more concentrated the solution the more absorbency it allowed. 
 
 
 
Safety: We wore safety glasses, but there weren't any dangerous materials that were used. 
 
 
Material:

  • 25 ml cylinder
  • copper sulfate
  • water
  • droppers
  • colorimetor
  • test tubes
  • test tube holders

 

Procedure: 
 

  1. Make a stock solution using 3.121 g an water. 
  2. Add designated amount of water from chart and amount of stock solution to test tube, increasing in the stock solution and decreasing in the amount of water. 
  3. Continue for six test tube. 
  4. Measure all six test tubes in the SPARK system for the absorbency. 
  5. Record data. 
  6. Create a standard curve on Excel. 
 
 
 
 
Evidence: Data table 
 
 
 
Imag0775-1

 
 
Claim: The higher the concentration the more absorbency that is allowed through the solution and the more water is added to the  solution the less the concentration is and the less absorbency that is allowed. 
 
 
 
 
 
Scientific Explanation: I learned that the more concentration the more absorbency that is allowed and the less concentration that is present the less absorbency that is allowed. Also that the concentration of a solution does affect how the much light is absorbed into a solution.We could prove Beer's law that by using the colorimtry system and making a standard curve that showed us the absrobance increased when the concentration increased.

 

 

 

Colorimetry Lab

Title: Will the solution go away completely eve if you dilute the solution?

Abrtract: The experiment was conducted to see how much light can be transmitted through different levels of concentration. The problem was that the higher the concentration the less light goes through. We used bluing liquid as our concentrated solution and then we used colorimetry and a spark system to see how much light would pass through. We observed that the lighter the solution the more light passed through. Overall the experiment showed that the solution didn't go away no matter how clear it became.

Safety: We wore safety goggles and made sure not to get any of the liquid on our hands. We weren't really working with dangerous equipment.

Materials: We used 10 test tubes, 2 droppers, graduated cylinders, 5mL of bluing liquid, and 4.5mL of distilled water for each test tube. Also we used a Pasco SPARK system to view the transmittance by using colorimetry.

Procedure:

Step 1: Gathered all the required materials.
Step 2: measured 5 mL bluing liquid in a graduated cylinder and then put it into the first test tube.
Step 3: Then we took .5 mL of the 1x solution and transferred it to the next test tube.
Step 4: We then added 4.5ml of water to the to the .1x solution.
Step 5: repeated 3 and 4 until all 10 test tubes were filled.
Step 6: Then we placed the liquids into the colorimetry system to see what the transmittance percentage was and this was done for all ten solutions.
Step 7: Record all data.

Evidence: Each solution went do .5 in concentration when the bluing liquid was added.( 1x,.1x,.01x,.001x,.0001x,.00001x,.000001x,.0000001x,.000000001x,.000000001x)

% of transmittance of solutions 1-10:

1: 0%
2: 0%
3: 0%
4: 9.3%
5: 96.5%
6: 60.4%
7: 64.7%
8: 101%
9: 106%                                                                                                                               10: 106%
The lower the concentration the higher the transmittance is of light through the solution.

Claim: The solution is always there no matter how much water is added, because there is never complete transmittance of light through the solution. There will always be some of the solution in there no matter how clear the solution appears.

Explanation: I learned that light is absorbed by the 1x solution completely and that the more the solution is diluted the more light can pass through. This is shown in the evidence section because the transmittance percentage is increasing and the concentration solution is decreasing.

Particle Zoo blog

It is so important because it allows for them to classify the different particles that were discovered.

An electron is classified as a lepton in the standard model, and a proton is a hadron and  are bounded states of two or more elementary particles, so the proton is made up of two up quarks, and netrons are classified as hadrons.

I think in the future they might disover more particles and that the will learn more about the particles already discovered.

Density Lab

 Research question: Where will the objects fall in the density column?

Abtract: The focus was to see which items will fall in what areas of the density column which was was filled with cornsyrup, water, and canola oil.Then we measured the mass and volume of each item to find the density of each one.

Saftey Considerations: Don't mess around in the lab or with the equiptment.

Material: 
  • Measured items
  • Scale 
  • Computer
  • Graduated Cylinder
  • Calculator

 

Procedure:
  • Measure Mass of items
  • Measure Volumes of each item
  • Calculate density
  • Record data

 

Evidence Collected: 
  • cork           brass    steel       wax          acrylic   zinc      polyetholene
  • 1.35g        34.30g    31.43g     22.30g    4.80g     6.58g    .04g
  • 12ml          4ml         4ml        9ml          4ml       1ml       .3ml
  • Density
  • .11g'ml       8.58        7.86        2.47        1.2       6.58         1.33

Claim: only the  acrylic, polyetholene and cork will float the rest will sink to the bottom because they are all heavier than the items in the density column.

Scientific Explination: The cork has a density .11 and the acrylic has a density of 1.2 and the polyetholene has a density of 1.33. The highest density in the column is 1.38 those are less so they float the rest are greater and they will sink.

Resources: computer.