Blood Lab
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Chemistry
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May 5, 2024
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© eScience Labs, 2016 Blood PRE-LAB QUESTIONS
1. List three circumstances that a CSI may be able to determine from a bloodstain pattern. - Type of bloodstain patterns present. - Direction of travel of the blood drops. - Distance of the blood source to the target surface. 2. Label Parts A - C in the figure below. A. Spine B. Satellite Splatter C. Parent Drop Image of blood spatter for labeling.
© eScience Labs, 2016 Blood 3. You are investigating a crime scene where a victim was stabbed multiple times while they were incapacitated on the floor next to a wall. Estimate the number of stab wounds based on the bloodstain pattern in the figure below. Explain how you determined your answer. There is likely 6 stab wounds, because there appears to be 6 parent drops.
© eScience Labs, 2016 Blood An image of blood spatter for question 3.
© eScience Labs, 2016 Blood EXPERIMENT 1: BLOODSTAIN ANALYSIS - HEIGHT AND VOLUME
Data Tables Table 1: Bloodstain Diameter of a Single Drop at Varying Distances Distance from Impact (cm) Bloodstain Diameter (mm) Observations 15 5 Circular stain, not much splatter 30 7 Circular stain, like 15 cm; no splatter 45 10 Larger, circular stain, no splatter 60 11 Circular stain, not much splatter 75 15 Much larger stain, circular stain, some splatter 100 15 Large stains, much more splatter, messier and not as defined in shape Table 2: Bloodstain Diameter of Varying Drops at the Same Distance Number of Drops Bloodstain Diameter (mm) Observations 1 5 Circular stain; small and neat 2 10 One big stain one small stain, both circular 3 15 Landed on top of each other; created a clump of stains 4 10 Messier stains; somewhat separated from each other 5 8 Stains differ in size; spread apart from each other 6 8 Stains differ in size; less defined and some piled on top of each other
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Related Questions
MULTIPLE CHOICE: Choose the letter of the best answer
Please answer all questions correctly
1. The standardization of volumetric solution does not require hydrochloric acid.
A. Permanganometry
B. Cerimetry
C. Iodimetry
D. lodometry
E.All of the choices
2. In the standardization of its volumetric solution, the primary standard is dried to constant weight, which means drying shall be continued until two consecutive weighings do not differ by more than 0.50 mg.
A. Permanganometry
B. Cerimetry
C. Iodimetry
D. lodometry
E.All of the choices
3. In the standardization of its volumetric solution, potassium iodide was added to
A. Permanganometry
B. Cerimetry
C. Iodimetry
D. lodometry
E.All of the choices
4. Starch is the indicator of choice for these procedures because it forms intense blue coloration with the solution.
A. Permanganometry
B. Cerimetry
C. Iodimetry
D. lodometry
E. C and D
5. In the standardization of its volumetric solution, the reaction needs to be…
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Which is not required in recrystallization?
a. solution is filtered at high temperature
b. moderate volatility solvent
c. saturated solution
d. solvent must dissolve the impurities
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1. Solubility Test
Table 1. Results for the solubility test.
OBSERVATION*
INFERENCE
SAMPLE
Ethyl acetate
**
Нехаne
Methanol
Water
Coconut oil
Vitamin E
Beef fat
Miscible (soluble) or immiscible (insoluble)
** polar or nonpolar
Sudan IV Test
Table 2. Results for Sudan IV test.
OBSERVATION*
INFERENCE
SAMPLE
Нехаne
Ethyl acetate
Methanol
Water
**
Coconut oil
Vitamin E
Beef fat
Homogeneous or heterogeneous mixture
** polar or nonpolar
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A sample is analyzed for Pb. Is the ppm in a dry sample greater than, equal or less than to the
ppm, in wet sample?
arrow_forward
To which sample solution the spike will be add?
the distillate>130C
the mass standard
the distilled <130C
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Preparing solution. Weigh out Sg of table salt. Dissolve it in 50mL of distilled water in a container
using a stirrer and label appropriately. Calculate the concentration in terms of percent mass per volume.
If you pour the 10ml hydrochloric acid into50ml distilled water Calculate it concentration in terms
of percent volume acid per total volume.
arrow_forward
Standardization of 0.10 M HCl1. Take three (3) clean and properly labeled 250-mL Erlenmeyer flasks. Into the three flasks, weigh 0.1 g of the primary standard Na2CO3 to the nearest 0.1 mg. Record the weights of the primary standard.2. Add about 75.0 mL of boiled distilled water and swirl to dissolve the solids.3. Add 2 to 3 drops of phenolphthalein indicator. Record the initial burette reading and titrate with the prepared 0.10 M HCl solution until phenolphthalein endpoint.4. Record the final burette reading for each titration in your data sheetDetermination of Ksp and Molar Solubility1. Add Ca(OH)2 to 250.0 mL distilled water with stirring until equilibrium is achieved. 2. Filter the undissolved precipitate. Measure out 50.0 mL of the supernate into a 250-mL Erlenmeyer flask using a pipette.3. Add a few drops of phenolphthalein indicator and titrate with standardized HCl solution until endpoint is achieved.4. Record the volume the HCl solution used. Perform two more trials.…
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Standardization of 0.10 M HCl1. Take three (3) clean and properly labeled 250-mL Erlenmeyer flasks. Into the three flasks, weigh 0.1 g of the primary standard Na2CO3 to the nearest 0.1 mg. Record the weights of the primary standard.2. Add about 75.0 mL of boiled distilled water and swirl to dissolve the solids.3. Add 2 to 3 drops of phenolphthalein indicator. Record the initial burette reading and titrate with the prepared 0.10 M HCl solution until phenolphthalein endpoint.4. Record the final burette reading for each titration in your data sheetDetermination of Ksp and Molar Solubility1. Add Ca(OH)2 to 250.0 mL distilled water with stirring until equilibrium is achieved. 2. Filter the undissolved precipitate. Measure out 50.0 mL of the supernate into a 250-mL Erlenmeyer flask using a pipette.3. Add a few drops of phenolphthalein indicator and titrate with standardized HCl solution until endpoint is achieved.4. Record the volume the HCl solution used. Perform two more trials.…
arrow_forward
Please don't provide hand writtin solution.....
I need Explation solution and step solution...
arrow_forward
In a thin layer chromatography (TLC) experiment, solute A traveled 20 mm while solute B traveled 30 mm. The solvent traveled 40 mm. Which has the greater affinity for the solvent?
a. not enough data
b. solute B
c. solute A
d. both A & B have equal affinity
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15. These are samples of about the same size that are carried through an analysis in exactly the same way.A. TitrateB. AnalyteC. ReplicatesD. Distillate
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part A
1. Concentration of Known NiCl2 Stock Solution
___500________ mM
Tube Number
Blank
#1
#2
#3
#4
#5
2. Volume of Known NiCl2 Stock Solution Pipetted Into Tube
0.00 mL
1.50 mL
3.00 mL
4.50 mL
6.00 mL
7.50 mL
3. Volume of Distilled Water Pipetted Into Tube
11.00 mL
9.50 mL
8.00 mL
6.50 mL
5.00 mL
3.50 mL
4. Total Volume of Solution In Tube
11.00 mL
11.00 mL
11.00 mL
11.00 mL
11.00 mL
11.00 mL
5. Diluted Concentration of NiCl2 In Tube
-----------
68.2 mn
136mn
204mn
273mn
341mn
1. Equation for the Best-Fit Straight Line
Y=3822x+4.7446
2. Absorbance at λmax for Diluted Unknown
0.87
3. Concentration of NiCl2 in Diluted Unknown
25.693 mM
Determine the dilution factor for your diluted unknown U1 based on how you prepared the solutions in Part A. Record this on your report sheet in Part D #4.
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Concentration of Acetic Acid in a Vinegar Solution.
Average molarity of
NaOH
Volume HC₂H30₂
sample
Final buret reading
Initial buret reading
Volume NaOH
(Show all units and all
calculations)
Molarity of HC₂H30₂
(unrounded)
Average molarity
of HC₂H302
(unrounded)
Deviations
Average deviation
Best estimate for
molarity of
HC₂H302
Average mass percent
HC₂H302
46.4mL
Oml
Ran out of Base
↓ ↓
↓ ↓
10.014
HOA
je beart
giov
isults weari?!
ferottelucuny
Cambia)
10
Kousad
Question
1. A Rolaids tablet contains calcium carbonate that neutralizes stomach acid. If 44.55 mL of 0.448
M hydrochloric acid is required to neutralize one tablet, how many milligrams of calcium
carbonate are in a Rolaids tablet?
CaCO, (s) + 2HCl(aq) → CaCl₂ (aq) + H₂O (1) + CO₂ (g)
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Please don't provide hand writtin solution.....
I need explation and step solution.....
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b. How would a student prepare 25.0 mL of 40.0% standard solution from a 100.0 % stock solution.
What is the volume of stock solution needed?
a. 10ml
b. 20ml
c. 25ml
d. 15ml
Please show work
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The density of the first fraction collected would be expected to be close to a value of ______.
1.00 g./mL
0.895 g/mL
0.789 mL
0.950 g.mL
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Multiple Choice
Each of the numbered items or incomplete statements is followed by answers or by completions of the statement.
Select the one lettered answer or completion that is best in each case. Write your answer before each number.
42. Primary Standard reagent used in standardization of 0.1N sodium hydroxide
a.
Sulfamic acid
C. sodium carbonate
KHP
b. sodium bicarbonate
d.
43.An analyst who determines the strength, potency and percentage purity of a drug or pharmaceutical product
is performing:
a. Special method
C.
d.
Pharmaceutical assaying
Identification test
b. Pharmacopoeial test
44.Chemical analysis which determines the amount or percentage content of a certain component in a sample:
a. Qualitative
C.
d.
Proximate
Ultimate
Quantitative
ܩ
b.
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A water sample B has a turbidity reading of 50 NTU. If a 50-ppm standard has a turbidity reading of 100 NTU, what is the concentration of the analyte in A that causes the water to be turbid?
a. 50 ppm
b.100 ppm
c. 75 ppm
d. 150 ppm
e. 25 ppm
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What lab equipment is used to manually stir solutions?
O a. thermometer
O b. striker
O c. stirring rod
O d. forceps
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1. The time it takes for the crushed antacid/chalk to be dissolved in vinegar is greater than the
dissolution time of antacid/chalk at room temperature water.
A. True
B. False
2. The broken antacid/chalk dissolved slowest in hot water than in room temperature water.
A. True
B. False
3. Comparing the dissolution time in a whole antacid/chalk, it is relatively slowest in room
temperature water.
A. True
B. False
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1. Which method can be used to remove temporary hardness but not permanent hardness from a sample of water?
A. Washing sodaB. Ion-ExchangeC. Boiling
2. What can be used to identify whether a sample of water is hard or soft?
A. Detergent solutionB. Soap SolutionC. Bromine waterD. Option 4
3. Which of the following is not a unit of hardness?
A. Parts per millionB. Degree centigradeC. Degree clarkeD. Degree French
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Table of chemicals and reagents with their physicochemical properties (name,
molecular formula, molecular weight, pKa, melting point, boiling point, etc.)
Write a short outline or a flow diagram of the procedure
List and safety issues
Read and understand the MSDS information for each chemical used in this practical
Experimental procedure
Please do not scratch the clear sides of the UV cuvettes as this will invalidate your results.
Part 1: Preparation of a calibration curve
A calibration curve should be constructed using at least five concentrations of the pure paracetamol standard
supplied in the range 3-15 ug/mL as follows:
Weigh about 150 mg of paracetamol accurately and transfer to a 200 mL volumetric flask. Add 50 mL of o.1 M
NaOH and dilute to about 100 mL with deionised water (DI). Shake and make up to volume with DI water. Dilute
10 mL of the resulting solution to 100 mL (volumetric flask) with DI water (= stock solution). Prepare standard
solutions containing 3, 6, 9, 12 and 15…
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Alligation Medial and Alligation Alternate. Show your complete solution.
1. How many mL of 70% ethyl alcohol and 30% ethyl alcohol should be mixed to prepare 100mL of 60% ethyl alcohol?
Volume of 70% ethyl alcohol = ?
Volume of 30% ethyl alcohol = ?
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For a polluted soil by crude oil. best method to wash it is by using
O a. EDTA
O b. NaOH
O c. Surfactant
O d. HCI
CLEAR MY CHOICE
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2
Trial 1: [4] Volume of NaOH, dispensed (mL)
Trial 1: [5] Molar concentration of NaOH (mol/L)
Trial 2: [4] Volume of NaOH, dispensed (mL)
How
Trial 2: [5] Molar concentration of NaOH (mol/L)
Trial 3: [4] Volume of NaOH, dispensed (mL)
Trial 3: [5] Molar concentration of NaOH (mol/L)
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3. The Maximum Acceptable Concentration (MAC) of Pb in drinking water is 10 ppb. If a sample hasconcentration of 65 nM, what will be the concentration in ppb and does it exceed the MAC?a. 8 ppb, no it didn’t exceed the MACb. 9 ppb, no it didn’t exceed the MACc. 12 ppb, yes it exceeds the MACd. 13 ppb, yes it exceeds the MAC
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1. A 50.00 mL stock CaCl2 solution was diluted with water in a 250.0-mL volumetric flask. A 25.00 mL aliquot of this was further diluted to a final volume of 100.0 mL. Finally, 20.00-mL aliquot of the resulting solution was analyzed and found to contain 0.1500 M CaCh2 Solve for the concentration of the stock solution in M. 2. A 50.00 mL stock CaCl2 solution was diluted with water in a 250.0-mL volumetric flask. A 25.00 mL aliquot of this was further diluted to a final volume of 100.0 mL. Finally, 20.00-mL aliquot of the resulting solution was analyzed and found to contain 0.1200 g CaCl2 Solve for %w/v CaCl2 in the stock solution.
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pls help and show solution plsss
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How many milliliters of a 1:50 wiv boric acid solution can be prepared from 500 mL of a 12% w/v boric acid solution?
a. 2500 mL
Ob.60 mL
Oc. 1200 ml
Od. 3000 ml
O e. 30 mL
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How many milliliters of a 17% w/v concentrate of benzalkonium chloride should be used in preparing 150 mL of a
stock solution such that 15 mL. diluted to 1 liter will yield a 1:5000 solution?
A. 2 ml.
B. 23.5 mL
C. 11.75 ml.
D. 0.2 mL
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8. Find the final concentration of ethanol as a percent (v/v) when 30 mL of ethanol 50 % (v/v), 60 mL of ethanol 70 % (v/v), and 40 mL of ethanol 95 % (v/v) are mixed together.
arrow_forward
What is the major difference in set up between a simple distillation and a fractional distillation?
O A. A fractionating column used during fractional distillation
B. Simple distillation does not need a condenser.
OC. Fractional distillation needs a longer fractionating column.
D. There is no difference in set up between a simple distillation and a fractional distillation,
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- A sample is analyzed for Pb. Is the ppm in a dry sample greater than, equal or less than to the ppm, in wet sample?arrow_forwardTo which sample solution the spike will be add? the distillate>130C the mass standard the distilled <130Carrow_forwardPreparing solution. Weigh out Sg of table salt. Dissolve it in 50mL of distilled water in a container using a stirrer and label appropriately. Calculate the concentration in terms of percent mass per volume. If you pour the 10ml hydrochloric acid into50ml distilled water Calculate it concentration in terms of percent volume acid per total volume.arrow_forward
- Standardization of 0.10 M HCl1. Take three (3) clean and properly labeled 250-mL Erlenmeyer flasks. Into the three flasks, weigh 0.1 g of the primary standard Na2CO3 to the nearest 0.1 mg. Record the weights of the primary standard.2. Add about 75.0 mL of boiled distilled water and swirl to dissolve the solids.3. Add 2 to 3 drops of phenolphthalein indicator. Record the initial burette reading and titrate with the prepared 0.10 M HCl solution until phenolphthalein endpoint.4. Record the final burette reading for each titration in your data sheetDetermination of Ksp and Molar Solubility1. Add Ca(OH)2 to 250.0 mL distilled water with stirring until equilibrium is achieved. 2. Filter the undissolved precipitate. Measure out 50.0 mL of the supernate into a 250-mL Erlenmeyer flask using a pipette.3. Add a few drops of phenolphthalein indicator and titrate with standardized HCl solution until endpoint is achieved.4. Record the volume the HCl solution used. Perform two more trials.…arrow_forwardStandardization of 0.10 M HCl1. Take three (3) clean and properly labeled 250-mL Erlenmeyer flasks. Into the three flasks, weigh 0.1 g of the primary standard Na2CO3 to the nearest 0.1 mg. Record the weights of the primary standard.2. Add about 75.0 mL of boiled distilled water and swirl to dissolve the solids.3. Add 2 to 3 drops of phenolphthalein indicator. Record the initial burette reading and titrate with the prepared 0.10 M HCl solution until phenolphthalein endpoint.4. Record the final burette reading for each titration in your data sheetDetermination of Ksp and Molar Solubility1. Add Ca(OH)2 to 250.0 mL distilled water with stirring until equilibrium is achieved. 2. Filter the undissolved precipitate. Measure out 50.0 mL of the supernate into a 250-mL Erlenmeyer flask using a pipette.3. Add a few drops of phenolphthalein indicator and titrate with standardized HCl solution until endpoint is achieved.4. Record the volume the HCl solution used. Perform two more trials.…arrow_forwardPlease don't provide hand writtin solution..... I need Explation solution and step solution...arrow_forward
- In a thin layer chromatography (TLC) experiment, solute A traveled 20 mm while solute B traveled 30 mm. The solvent traveled 40 mm. Which has the greater affinity for the solvent? a. not enough data b. solute B c. solute A d. both A & B have equal affinityarrow_forward15. These are samples of about the same size that are carried through an analysis in exactly the same way.A. TitrateB. AnalyteC. ReplicatesD. Distillatearrow_forwardpart A 1. Concentration of Known NiCl2 Stock Solution ___500________ mM Tube Number Blank #1 #2 #3 #4 #5 2. Volume of Known NiCl2 Stock Solution Pipetted Into Tube 0.00 mL 1.50 mL 3.00 mL 4.50 mL 6.00 mL 7.50 mL 3. Volume of Distilled Water Pipetted Into Tube 11.00 mL 9.50 mL 8.00 mL 6.50 mL 5.00 mL 3.50 mL 4. Total Volume of Solution In Tube 11.00 mL 11.00 mL 11.00 mL 11.00 mL 11.00 mL 11.00 mL 5. Diluted Concentration of NiCl2 In Tube ----------- 68.2 mn 136mn 204mn 273mn 341mn 1. Equation for the Best-Fit Straight Line Y=3822x+4.7446 2. Absorbance at λmax for Diluted Unknown 0.87 3. Concentration of NiCl2 in Diluted Unknown 25.693 mM Determine the dilution factor for your diluted unknown U1 based on how you prepared the solutions in Part A. Record this on your report sheet in Part D #4.arrow_forward
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