CHEM 30A Indepdendent Project

7 Solid lead (II) nitrate is slowly added to 125 mL of a 0.190 M potassium hydroxide solution until the concentration of lead ion is 0.0547 M. The percent of hydroxide ion remaining in solution is %. Submit Answer $ 4 R LLO % 5 [Review Topics) [References Use the References to access important values if needed for this question. Retry Entire Group T Cengage Learning | Cengage Technical Support ^ 6 * 8 more group attempts remaining MacBook Pro G H 2 & 7 A J * 0 8 ( 9 UD U K F 0 ) O ◆ P | Previous Email Instructor { [ + 11 = Next> Save and Exit } ]

3. Standard white vinegar you can buy in the grocery store is 5% concentration. That means 5% of the liquid vinegar is acetic acid and 95% of the solution is water. In a hardware store, you can buy industria strength vinegar, which is 30% concentration. This means that 30% of the vinegar is acetic acid, and the remaining 70% is water. Samuel does another experiment, this time with 5% vinegar and 30% vinegar. He sets up two science fair volcanoes (in no particular order), each with the same temperature, mass of baking soda and volume o vinegar. But one volcano uses 5% vinegar and the other volcano uses 30% vinegar. He measures the volume of gas production for the'first minute of each reaction, and he records the data below. Volcano # 1 Volume of gas produced (mL.) vs. Time (s) for Volcano #1 Time Volume of gas (s) produced (ml) 60 E 50 10 20 30 25 8 40 38 46 30 20 Volume of gas produced (ml) 40 50 50 60 52 of 10 53 20 40 60 80 Time (s) Volcano # 2 Volume of gas Volume of gas produced…

In any manufacturing process, reaction monitoring ensures that a chemical reaction proceeds as expected. Table 1 shows the monitoring data for the formation of chlorohexane, collected using a technique called gas chromatography. Note that the concentrations of the chlorohexane solutions are given in millimoles per litre (mmol l–1). The abbreviation mM (millimolar) is frequently used. Plot a graph of the data in Table 1. The graph should be drawn on graph paper or use fine grid if it’s drawn on Excel. Elapsed Time/Hours  Concentration of Chlorohexane/mM 0 0 2 40 4 65 6 80 8 90 10 95 12 99

Pls help ASAP. Pls show all work and calculations.

You work in a research organization that is looking for markers of various diseases that can be used as a diagnostic for the disease. It has been reported in the past that high levels of Cu are found in the sweat of people with cystic fibrosis. One of the research projects is focused on looking for high levels of Cu in samples that can be obtained non-invasively such as saliva, sweat, hair, nails, etc. The lab will analyze large samples for Cu. What instrument would you recommend purchasing to support this work, Atomic absorption spectrophotometer or an inductively coupled plasma atomic spectrophotometer? Explain the basis for your decision.

What is the role of sodium and chloride ions in this experiment

Consider the reaction below and answer the question below the reaction. A student performed a synthesis of ethyl 4-aminobenzoate (C) as shown in the reaction above. The student added 1.20 g of 4-aminobenzoic acid and 12.0 mL of ethanol together in the presence of sulfuric acid. The reaction mixture was heated to reflux for a period of 45 minutes. H₂N OH 4-aminobenzoic acid MM 137.14 g/m ol A + CH3CH₂OH ethanol MM 46.10 g/mol B ethyl 4-aminobenzoate ethanol H+ 4-aminobenzoic acid benzocaine none of the above H₂N OCH₂CH3 + H₂O Identify the limiting reagent of this reaction. Hint: the density of ethanol is 0.789 g/mL. ethyl 4-aminobenzoate MM 165.19 g/mol с

Consider the reaction below and answer the question below the reaction. A student performed a synthesis of ethyl 4-aminobenzoate (C) as shown in the reaction above. The student added 1.20 g of 4-aminobenzoic acid and 12.0 mL of ethanol together in the presence of sulfuric acid. The reaction mixture was heated to reflux for a period of 45 minutes. H₂N OH 4-aminobenzoic acid MM 137.14 g/m ol A + CH3CH₂OH ethanol MM 46.10 g/mol H+ C-H (aliphatic): 3100 cm¯ -1 N-H: 2500 cm¯1 or ethyl 4-aminobenzoate MM 165.19 g/mol с C-H (aromatic): 2650 cm-¹ C=O: 1730 cm-1 all of the above H₂N B Identify the peaks that you would expect to see in the IR spectrum for ethyl 4- aminobenzoate. Note that both the peak and the wavenumber must be correct. OCH₂CH3 + H₂O

Consider the reaction below and answer the question below the reaction. A student performed a synthesis of ethyl 4-aminobenzoate (C) as shown in the reaction above. The student added 1.20 g of 4-aminobenzoic acid and 12.0 mL of ethanol together in the presence of sulfuric acid. The reaction mixture was heated to reflux for a period of 45 minutes. H₂N OH 4-aminobenzoic acid MM 137.14 g/m ol 2.44 g 1.21 g 3.24 g 1.45 g + CH3CH₂OH ethanol MM 46.10 g/mol B H+ H₂N OCH₂CH3 + H₂O ethyl 4-aminobenzoate MM 165.19 g/mol A с What is the theoretical yield for the reaction?

POTASSIUM PERMANGANATE AND SODIUM HYDROXIDE Repeat procedure 3 using 6M sodium hydroxide instead of 6M sulfuric acid. Allow the solution to stand for about 15 minutes and write an observation of any changes. Observations: Balanced chemical equation: 2KMnO 4(aq) + 3NaHSO 3(aq) + NaOH (aq) → 2H2O(l) + K2SO 4(aq) + 2MnO 2(s) + 2Na2SO 4(aq) What substance is responsible for the color change?

Based on this student data, calculate the average molarity of the NaOH solution. Standard: KHP = potassium hydrogen phthalate, MM 204.4 g/mol Student Data Trial 1 E KHP mL initial: NaOH mL final: NaOH 2.02 0.57 19.25 Trial 2 2.05 19.25 39.80 Trial 3 1.99 1.65 20.75

Lab 6: Chemical Reactions Post-Lab Questions Station V: Heating Cu with Atmospheric O₂ Chemical equation: Complete ionic equation: Net ionic equation: General reaction type: Station VI: Reacting CuSO4 Solution with Steel Wool (Fe)

The enzyme urease is widely used for determining urea concentration in blood. The Michaelis constant for urease at room temperature is 2.0 mM and k2 = 2.5 × 10^3 s^-1 at pH = 7.5. Based on the kinetic experiment, when 4.76 mM urease was used, the initial rate of the reaction was determined to be 8.1 M/sec. What is the concentration in unit of mM of urea in blood? Please keep your answer to two decimal place. Please convert all concentration unit to mM in calculation. The answer is 4.26 (I would need help getting this answer)

16. The combustion of gasoline (octane) in a car engine can be represented by the following equation: 2C3H18(1) + 2502(g) a. What mass of oxygen is used up to burn a full tank of 36.00 kg of gasoline? Text --> 16CO2(g) +18H20(g) b. Why might a vehicle that is calibrated to run perfectly at sea level run poorly at higher elevations? Text Тext According to the Canadian Automobile Association, the average Canadian drives 20,000 km/yr. C. Assuming that distance, how many more kg of carbon dioxide are added to the atmosphere each year by a Toyota Tacoma (fuel economy of 12.8 L/100 km) than a Toyota Prius (4.52 L/100 km)? The density of gasoline is 0.719 kg/L.

What concentration of AgNO3 (in ppb) is present in 7.1 X 10 M AgNO3 ? The molar mass of AgNO3 is 170 g/mol. Make sure you show the work to receive full credit. Edit View Insert Format Tools Table 12pt ✓ Paragraph BIUAv2v T²V هم 阎圃v|

Need help filling this out. It is the Data Sheet for Ch. 2 Qualitative Analysis. Very much appreciated!

A water quality monitoring found that local bayou contains 8.72x10-4 % (wt/wt) nitrate ion ( MW = 62.01 g/mol).  Yet the EPA standard for the nitrate content in a natural water body is 1.613x10-4 M or lower.  Is the mentioned bayou water in that location acceptable from the EPA standard ?   List your calculation steps (Density of bayou water is 1.0 g/mL).

acid A student prepares a 1.2 M aqueous solution of benzoic acid (CH,CO,H). Calculate the fraction of benzoic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits.

Chem101 A Postlab Quiz 11: BIOL 122 - Intr X + A app.101edu.co Apps y Canvas 5 MYACU 101 Chem101 Q Quizlet O Khan Academy YouTube E Google Docs Question 2 of 5 What volume (in mL) of 0.2600 M HBr is required to neutralize 40.00 mL of 0.8000M NAOH? +/ MacBook Pro esc 888 ►II » # 24 & 4. 7 8. Q W E T Y U

For lab 4, we combined baking soda with vinegar, according to the chemical equation NaHCO 3 + CH 3COOH ==== NaCH 3COO + CO 2 + H 2O Consider 3 experiments: (i) 2g baking soda + 5mL vinegar, (ii) 2g baking soda + 10mL vinegar and (iii) 2g baking soda + 20mL vinegar. The amount of CO 2 produced was highest for (iii) and lowest for (i). For these experiments, which of the following is true? Vinegar ran out first Baking soda ran out first They both ran out at the same time Neither ran out

What’s the answer

8 Reactions between certain organic (alkyl) halides and water produce alcohols. Consider the overall reaction for t-butyl bromide (2-bromo-2-methylpropane). (CH3)3CBr(aq) + H2O(1) →(CH3)3COH(aq) + H*(aq) + Br "(ag) k[(CH3)3CB1]. The accepted mechanism for the The experimental rate law is rate = %3D reaction is shown below. (1) (CH3)3C-Br(aq) →(CH3)3C*(aq) + Br "(aq) [slow] (2) (CH3)3C*(aq) + H2O(1) →(CH3)3C-OH2*(aq) [fast] (3) (CH3)3C-OH2*(aq) →H*(aq) + (CH3)3C-OH(aq) [fast] a) Why doesn't H2O appear in the rate law? b) Write rate laws for the elementary steps. c) What intermediates appear in the mechanism? d) Show that the mechanism is consistent with the experimental rate law. ed to the of consumption of N