2023 Module Nine Lesson Two Assignment

QUESTION 24 In the experiment "Beer-Lambert's Law and Spectrophotometry", you prepared a calibration plot similar to the one pictured below. What is the approximate concentration of a solution whose absorbance is 0.35? Calibration Plot 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0. 0.01 0.02 0.03 0.04 0.05 Save A Click Save and Submit to save and submit. Click Save All Answers to save all wnswers. Absorbance

Activity 4: Aromatic Water Peppermint water (Simple solution method) Formula Peppermint oil ___ Purified water  ___ To make          60ml Materials: Erlenmeyer flask, filter paper Procedure: (Provide the procedure)

Match each chemical or item with the proper disposal or cleanup method. Not all disposal and cleanup methods will be labeled. damp metal pieces Part B Return to correctly labeled "drying out" beaker. Answer Bank damp metal pieces Part B Place used items in the drawer. calcium chloride solutions Part A Rinse with deionized water, dry as best you can, return to volumetric flask Part A the instructor. volumetric flask Part A metal sheets Part C Return used material to the instructor. damp metal pieces Part B calcium chloride solutions Part A Pour down the sink with plenty of running water. metal sheets Part c volumetric flask Part A Pour into aqueous waste container. damp metal pieces Part B Place used items in garbage.

science / chemistry / chemistry questions and answers / can you please answer the second part of... Question: Can You Please Answer The Second Part Of The Question About The Brief Procedure For The Recrystallization Of Benzoic Acid... And Its Overall... Lab Report Follow the standard format for your lab report. Include a calculation of your percent recovery of cinnamic acid based on 85% of your initial material being cinnamic acid and the actual amount of that initial material you weighed. To illustrate your understanding of recrystallization, include a brief procedure for the recrystallization of benzoic acid contaminated with both a little salt and a little sand from water. Benzoic acid is relatively insoluble in cold water, but quite soluble in hot water. Note that you are using only one solvent, so the procedure will be slightly different, and that you have to add a step that is mentioned in the Background section. Can you please answer the second part of the question about the…

The chemical reaction can only take place when the reaction particles ____________ with each other. Show solution and choose from the choices below:       Mix together       Collide       Immerse       Separate

ODUCTION LABORATORY SIMULATION Lab Data Verify your volume measurement Standardized NaOH (M) Initial volume of buret (mL) Volume of vinegar (mL) Observations sodium hydroxide levels dropped Final volume of buret (mL) Volume of NaOH (mL) Molarity of acetic acid (M) 0.3803 1.42 10.00 21.57 How to calculate vinegar concentration METHODS - X RESET -18 funt -19 -20 -21 -22 MY NOTES ALAB

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Data And Report Recrystallization Of Acetanilide Recrystallilzation Observations of Solubility Tests Table 1. Solubility tests Soluble at 25 °c Soluble at bollng polnt acetone Yes Yes ethanol Yes Yes petroleum ether No No water No Yes Volume of solvent used (mL) 10.8 5% of solvent added 0.54 Mass of initial acetanilide (g) Mass of filter paper (g) 0.475 0.301 Mass of filter paper with acetanilide (g) 0.736 Calculations and Analysis Recrystallilzation solvent used Saved Choose... Mass of recovered acetanilide (g) Your percent recovery Look up the expected melting point for the recovered acetanilide. Normal BIIIU X2| X² | → EEE Based on the video on the course page, describe what you should see during recrystallization. BII|U X2 | X² | Normal

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Reactions of Na₂CO3 * Reactions with a carbonate salt and acid are gas evolving! I Na₂CO3(aq) Na* CO3²- Na2CO3(aq) Na₂CO3 (aq) Na₂CO3(aq) Na₂CO3 (aq) Na₂CO3 (aq) Na2CO3 (aq) Na₂CO3 (aq) Na₂CO3 (aq) Na₂CO3 (aq) + + + + 2 Pb(NO3)2 (aq) H* CI HCl (aq) Na3PO4 (aq) KI (aq) CuSO4 (aq) H₂SO4 (aq) NaOH (aq) AgNO3(aq) CaCl2 (aq) HNO3(aq) →>> →> →>>> ➜>> ↑ ↑ Na Cl + H* CO3²- NaCl (aq) + [H₂CO3 (aq)] → NaCl (aq) + H₂O (1) + CO2 (s) 2 NaCl (aq) + H2₂O (1) + PAGE 123 OF 232 (g)

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Table 1.1 Concentration of reactat Volume of Volume of distilled Concentration of Volume of 0.1 M HCI solution 0.2 M Na,s,0, Time solution water (s) Na,s,0,(M) (s*) (mL) (mL) (mL) 50.00 0.00 0.20 10.00 27 O 037 40.00 10.00 0.16 10.00 38 0.026 30.00 20.00 0,12 10.00 55 O 018 20.00 30.00 0.08 10.00 90 0.011 0.04 22나| 0.004 10.00 40.00 10.00 4. Calculate the concentration of the sodium thiosulphate solution after the dilution and the value of 1 against the concentration of sodium thiosulphate solution.) 5. Plot a graph of

i) How many moles of hydrochloric acid were there in the volume of acid added in the titration? ii) How many moles of calcium hydroxide were there in the 25 cm sample of solution that the student used in the titration? iii) What was the concentration of the calcium hydroxide solution in mol/dm?

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Clinical __________________ is defined as a quantitative relationship between dose and effect that provide a way to interpret the measurement of concentrations of drugs in biological fluids.

I need help calculating the Molarity of the solution in the first picture please!!!

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…

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In chemistry class, a student conducted an investigation about factors affecting the solubility of copper (II) sulfate (CuSO4) in water. The data was recorded in the table below. Factors Trial 1 Trial 2 Trial 3 Stirring Yes No Yes Temperature 25°C 25°C 60°C Finely Crushed Powder Surface Area Large crystals Large crystals Q1)Which trial should dissolve the fastest? Q2) How are the collisions between the CuSO4 and water affected? Format BIU

Carla is using a fertilizer that contains nitric acid. How is nitric acid classified? strong acid weak acid strong base weak base Save and Exit Next Mark this and return ContentViewers/AssessmentViewer/Activit.

16 You need to make an aqueous solution of 0.237 M cobalt(II) fluoride for an experiment in lab, using a 250 mL volumetric flask. How much solid cobalt(II) fluoride should you add? grams Submit Answer Review Topics] [References] Use the References to access important values if needed for this question. Retry Entire Group 8 more group attempts remaining Cengage Learning Cengage Technical Support Previous Next> Save and Exit

yout References Mailings Review View rt Endnote t Footnote ✓ w Notes es 5 Search Researcher Absorbance 5 4.5 4 3.5 2.5 2 1.5 1 0.5 0 Research 0 Insert Citation 1 1. Construct a standard curve in Excel by plotting concentration (in ppm) on your x-ax (unitless) on your y-axis for your known solutions. Label the axes on the graph and provi title. See Figure 5 in the lab handout for an example. Use a linear trendline to generate a data. Label the graph with the equation and the R2 value. Insert your labeled graph in the Help Manage Sources Style: [APA 2 Bibliography Citations & Bibliography Sciwheel Nitrate Standard Curve 3 4 ty=0.8842x-0.8191 R²=0.9509 Q..**. Concentration Insert Caption 5 6 Insert Table of Figure Update Table Cross-reference Captions ww 7 2. Using the equation from your graph, determine the nitrate concentration (in ppm) in each of samples. Text Predictions: On Accessibility: Investigate O Search 8509 FORGE *

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