Concept explainers
(a)
Interpretation:
The given data for system temperature versus time is to be fit into a straight-line using the method of least squares. Also, the formula for
Concept introduction:
Method of least squares:
If
To fir the data into the straight-line plot, the value of
Perform differentiation on equation (1) to calculate the values of
Now, use these values to calculate
And,
The straight-line that fits into the given data is now,
With
(b)
Interpretation:
The given data is to be plotted on the rectangular axes and the expression for
Concept introduction:
Given an equation,
Here,
According to the method of least square used to fit data into a straight-line,
Want to see the full answer?
Check out a sample textbook solutionChapter 2 Solutions
EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
- Chlorite is reduced by bromide in acidic solution according to the following balanced equation: C10₂ (aq) + 4Br- (aq) + 4H+ (aq) → Cl(aq) + 2Br2 (aq) + 2H₂O (1) A[Br₂] If At A[C10₂] At during the same time interval? Express your answer to two significant figures and include the appropriate units. = 4.1x10-6 M/s, what is the value of A[C10₂] At Part B = O Rate = μA Value Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Units What is the average rate of consumption of Br during the same time interval? Express your answer to two significant figures and include the appropriate units. μАA Value Units ? ?arrow_forwardAn environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd²+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °℃ overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 73.69 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0 mL of 0.1 M HCl to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.0 mL volumetric flasks, each containing 5.00 mL aliquots of the sample solution. Varying amounts of a 84.0 ppb (µg/L) Cd²+ standard were added to each of the flasks, which were then brought to volume with 0.1 M HCl. The Cd²+ content of the solutions was then analyzed using GFAAS, resulting in the absorbance data given in the table.…arrow_forwardConsider the following data: HX → X- + H+ Ką = 6.61 · 10- 5 H2A + НА + Н + Ka = 2.68 · 10-7 Calculate the Keg for the following reaction: H2A + X¯ + HA¯ +HX Record your answer in scientific notation to 3 sig figs.arrow_forward
- At 36.0 °C the density of water is 0.9936870 g/cm3.At 37.0 °C the density of water is 0.9933390 g/cm3.Use linear interpolation to calculate the density (D) of water at 36.2 °C, to the nearest 10-7g/cm3. ANSWER IS: D = 0.9936174 g/cm^3arrow_forwardA Chemistry 20 student uses a thermometer and a hot plate and measures the boiling point of ethyl alcohol to be 74.3 ºC. Then, she looks in a reference book and finds that the actual boiling point of ethyl alcohol is 78.4 ºC. What is her percent error?arrow_forwardEnter a balanced equation for the reaction between aqueous lead(II) nitrite and aqueous sodium bromide to form solid lead (II) bromide and aqueous sodium nitrite. Express your answer as a chemical equation. Identify all of the phases in your answer. | 圈 femplates Symbols undo redo reset keyboard shortcuts help ΑΣΦ . DA chemical reaction does not occur for this question.arrow_forward
- An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Ca+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 91.79 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0 ml. of 0.1 M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.0 ml volumetric flasks, cach containing 5.00 ml. aliquots of the sample solution. Varying amounts of a 85.0 ppb (ug/L) Cd+ standard were added to each of the flasks, which were then brought to volume with 0.1 M HCI. The Cd content of the solutions was then analyzed using GFAAS, resulting in the absorbance data given in the table. TTI…arrow_forwardYou have been provided with data of 2 groundwater samples. The following are the major constituents (in mg/l): Parameter Sample 1 Sample 2 Са 35 27 Mg 33 5.75 Na 28 16 K 1.3 0.7 НСОЗ 177 327 SO4 15 22 Cl 6.9 4.4 Boron 4.0 1.0 EC (dS/m) 0.511 0.237 TDS (mg/l) ? Tasks: 1. Check for Ionic balance. 2. Estimate TDS in mg/L 3. Show data in a. Vertical bar graph b. Vector diagram c. Pattern diagram d. Circular diagram e. Trilinear diagram f. Schoeller semilogarithmic diagram 4. Calculate %Na, SAR, Hardness 5. Discuss suitability of these waters for agricultural use. 6. Is this water suitable for drinking? What treatments will be needed to make it drinkable? 7. Is there any seawater intrusion in these aquifers? Expalin. 8. Make any other relevant commentsarrow_forwardTime(s) [X3] (mole/L) 0 0.600 500 0.481 1000 0.392 1500 0.336 2000 0.273 2500 0.230 3000 0.181 3500 0.156 4000 0.120 4500 0.106 5000 0.072 plot ln[X3] vs time plot 1/[X3] vs. timearrow_forward
- Use the References to access important values if needed for this question. Two-Step Algebra a =b+ cd lne In order to solve the equation above for d, you must: Step One Add the same expression to each side of the equation to leave the term that includes the variable by itself on the right-hand side of the expression: -b ta =-bv +b+ cd Ine Step Two Multiply both sides of the equation by the same expression: x(a - b) = xcd Ine The resulting equation is: d = Submitarrow_forwardGeologists identify carbonate minerals by reaction with acids. Dolomite, for example, contains magnesium carbonate, which reacts with hydrochloric acid by the following reaction: MgCO3(s)+HCl(aq)→MgCl2(aq)+CO2(g)+H2O(l) Enter the balanced chemical equation for this reaction. Express your answer as a chemical equation. Identify all of the phases in your answer. Enter the balanced net ionic equation. Express your answer as a chemical equation. Identify all of the phases in your answer. Classify the reaction as a precipitation, neutralization, or redox reaction.arrow_forwardTaking into account that dH = TdS + Vdp,what is true about temperature? A) T = (p/S)VB) T = (H/S)pC) T = (H/p)SD) T = (S/p)varrow_forward
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning