ot precise
Not job using precision to describe your r^2 value.
48 Matching Annotations
- Feb 2025
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online.clackamas.edu online.clackamas.edu
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is
Keep in past tense.
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benzoicacid.
Benzoic acid and lauric acid solution.
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Figure 1: degrees C over molality
For some reason, your numbers, chart titles, equation, or r^2 value didn't show up on your graph.
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.153 molal concentration of lauric and benzoic acid were melted, and thetemperature was measured for its freezing points. Its freezing point was subtracted fromthe freezing point of the lauric acid and the change in temperature was calculated to be1.6 degrees Celsius..313 molal concentration of lauric and benzoic acid were melted, and thetemperature was measured for its freezing points. Its freezing point was subtracted fromthe freezing point of the lauric acid and the change in temperature was calculated to be1.9 degrees Celsius..457 molal concentration of lauric and benzoic acid were melted, and thetemperature was measured for its freezing points. Its freezing point was subtracted fromthe freezing point of the lauric acid and the change in temperature was calculated to be2.8 degrees Celsius..625 molal concentration of lauric and benzoic acid were melted, and thetemperature was measured for its freezing points. Its freezing point was subtracted fromthe freezing point of the lauric acid and the change in temperature was calculated to be2.3 degrees Celsius..767 molal concentration of lauric and benzoic acid were melted, and thetemperature was measured for its freezing points. Its freezing point was subtracted fromthe freezing point of the lauric acid and the change in temperature was calculated to be6.9 degrees Celsius..915 molal concentration of lauric and benzoic acid were melted, and thetemperature was measured for its freezing points. Its freezing point was subtracted fromthe freezing point of the lauric acid and the change in temperature was calculated to be4.4 degrees Celsius.
None of this is really needed. You don't need to describe each individual temperature as it is not needed.
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he freezing point of lauric acid was determined to be 43.3 degrees Celsius
Wrong. 43.3 was the class average not the freezing point.
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molal concentration.
You could state the concentrations here.
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beaker with cool water
What size beaker? How full was the beaker?
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The tube was clamped andsubmerged into 400 mL beaker filled with water on a hot plate.
Describe filling the beaker. Tap water, heater was put on full and turned down when water began to boil, etc.
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Bysubtracting the freezing point of the mixture and the freezing point of the pure solventthe change in freezing point was determined and the freezing point constant wascalculated
Don't describe that something was calculated. Just strictly say the goal and how it as completed.
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quation 1
Make sure to include i and delta T should have a sub f next to it.
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The identity of the solute does not matter
Not really needed
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online.clackamas.edu online.clackamas.edu
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51.3% which shows inaccurate data. Similarly, the R2 value for the best fit line is 0.5842which is far from a perfect linear graph of 1.0. This shows that the data is fairlyimprecise and does not really falling into a linear pattern.
You could use accuracy and precision to describe percent error compared to r^2.
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giv
Keep in past tense.
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for 0.3g, 0.45g,0.6g, 0.75g, and 0.9g.
Include all the digits when weighing something. Don't round to one decimal place.
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Freezing
freezing*
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LabQuest
What type of LabQuest?
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After the test tube wasremoved from the water and a temperature probe was placed into the hot lauric acid
I see what this sentence is trying to say but I had to read it a couple times. Could take out "and" and replace with a comma.
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Equation 1
Good equation
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In this lab, the freezing temperatures of both lauric acid as well as a lauric acidsolution were compared. This value could then be compared to find theฮTf value atdifferent concentrations. The data could then be plotted and Kf could be obtained
What sis the exact goal of this experiment? If I didn't have this lab packet I wouldn't understand why the data was being compared.
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Then m is themolality of the solution, this is the moles of solute per kg of solvent
Make this two sentences or "m is the molality of the solution which is moles of solute per kg" just so the sentence flows better.
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- Jan 2025
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online.clackamas.edu online.clackamas.edu
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Our results were veryinaccurate. Other peers conducting the lab got a much higher ฮT value
Stated that results were off but didn't give a strong explanation of why. Try to stay away from "other peers got higher value"
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percentage error of -32.0%
How was this found?
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Equation 7 was divided by 2. Equation 5 was inverted. Equation 6 was notmanipulated. The sum of species formed Equation 4.
A lot of equations being thrown into two sentences with minimal explanation as to why or what equation was used for.
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moles
Explain or use an equation to show how it was converted to moles.
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Enthalpy of MgO and HCl Reaction
Centered subtitle.
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Hessโs Law
Started to talk about Hess's Law but then got off topic bit. Describe what Hess's Law is.
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๐เฏฆเฏฌเฏฆ = โ๐เฏฅเฏซเฏกEquation 2
Explain equation 2.
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The mass of the liquid/solution is measured. The mass of a reactant orobject is always recorded. The temperature of the liquid is measured in the beginning. After adding amaterial with a differing temperature or one that produces a chemical reaction, the temperature ofthe liquid is measured at the end
Unnecessary to use in intro section. Doesn't tie into this section.
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Where q = energy (joules), m =mass of heated material (grams), c = the specific heater capacity of the heated material (J/gโขยฐC), andฮT = change in temperature of heated material (ยฐC). ฮT is calculated by taking the final temperatu
Good job explaining equation.
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Lab #6 Repor
Needs stronger title.
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online.clackamas.edu online.clackamas.edu
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Magnesium Heat Capacity Determination
A lot of different section going on and gets hard to follow. Stick to intro, methods, and results and discussions. Use subheadings to split up sections if needed.
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g equation one
No explanation of equations.
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=mcฮT Equation 1-q system = q surroundings Equation 2
Questions should be centered and referred to throughout the report.
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Method
Lack of explanation and third person formatting in this section.
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First
Don't use words such as first and then because it turns it into a set of instructions.
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Heat Capacity Determination
Should be a centered subtitle.
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Enthalpy and Calorimetry
Needs to include goal of experiment at the end of introduction.
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Introduction
Add equations into introduction. No explanation of Hess's Law being used.
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can bemeasured.
How?
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endothermic reaction. In the case that the system (reaction) releasesheat to the surroundings, it would be considered an exothermic reaction.
Good explanation.
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online.clackamas.edu online.clackamas.edu
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percent error
Add this into results and discussion. How was percent erros found?
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-583.4 kJ/mol
How were units of kj/mol determined.
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-3.42 x10^3 J.
Type this in as an equation instead so it is easier to read.
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.42 x 10^3 J
kj not J
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were recorded accordingly,
Don't need to include that data was recorded.
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Hessโs Law basically
Use a stronger word instead of basically. This makes it sound uncertain.
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โ๐ป = ๐๐/๐๐๐
This isn't necessarily an equation. Could add the units somewhere in the text.
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