CHEM 207 Exp 3 Prelab

answer number 6. show your solutions

I am not understanding how the exothermic, endothermic can be determined from the graph

5. Compute the molarity of a solution that contains 5.62 g of Na₂CO3 in enough water to make 750.0 mL of solution. (3 pts.) 1 Q A Z 1 ption 2 W S X H cmd #3 E D C 54 R F % 5 V T G را opt + 11 { } [ 2.1 de ? 1

answer number 9. show your solutions

Chemistry The amount of V was found to be 0.19% (+/-) 0.02% V (N=6). Calculate t-calc, assuming 95% confidence level.

a Search Bb 1. Chem & meassur Bb Take Test: Assignm X G what measuremen G can you get your ba X A bbhosted.cuny.edu/webapps/assessment/take/launch.jsp?course_assessment_id=_2135287_1&course_id=_2082502_1&content_i. * * Question Completion Status: O 3 gallon QUESTION 5 Write the following number in scientific notation 80,941.6412 * NOTE: to write in Scientific Notation in Blackboard, use a "e" instead of the 10?. For example; 1.234×105 would be 1.234e-5 QUESTION 6 Which of the following prefixes makes the greatest unit?

6 PLEASE PROVIDE THE INTERPRETATION OF ALL SAMPLES FOR HELPFUL RATINGS. THANK YOU. *INCLUDE ALL YOUR REFERENCES

(9.29 × 105/8)-20.81 =  with correct sig figs

Did I do this correctly? If not can someone show me what I did wrong?

(lab)1. What is the % yield of recovered caffeine? recovered is 10 mg.  (Post lab) 2. What was the % yield of the experiment if there is a possible recovery of 50 mg caffeine? Show calculations

Q2-Midterm (Storchiametry) Given the unbalanced Chemical Equation Fe₂ O₂ + HBr → Fc Br₂ + H₂D 2) How many makes of Fc Br, an produced per mole of HBr? Show detail Calculatio 2-) What weight of HBr is nuded for bo moks of HBr? (.) How many grams of water can be spreduced per 2 mokes of FerD₂? "?!

6. _(6a)_ 2CUSO4. + 4NaOH » CH:COOH ±_(6b)__ + 2NA2SO4 + HzO

I need 1,2and 3 please

I need help completing the missing pieces on this table for trial 1 and 2, please. Also how do I figure out the pressure of CO2 in the system, please?

PLEASE ANSWER 3 and 4 ONLY PLEASE ASAP

b) The thermogravimetric curve for calcium salicylate monohydrate (CaC14H1006-H20) is shown below. (mw 332 g/mol). Starting with an initial sample mass of 16.55 mg, calculate the mass of the sample remaining when it is heated to ) 350 oc and ii) 800 oc. The first step is loss Of H20 (mw 18 g/mol), followed by loss Of C703H6 (mw 138 g/mol), then C6H4 (mw 76 g/mol) and finally CO2 (mw 44 g/mol). Give your answers to two decimal places and show your work. CaC,,HO, H.O CaC.,H,0 of 20- 40 CaC,0.H, 60- CACO, CaO 80 100 200 400 600 800 100 Temperature (C)

Phthalein Dye Test Chemical Reaction Balanced equation

7-21. Calculate the NBOD of 200 mg/L of a casein (C8H₁2O3N₂) dairy waste. Assume the following reactions: C8H₁2O3N₂ + 80₂ = 8CO₂ + 3H₂O + 2NH3 NO3 + H+ + H₂0 NH3 + 20₂ 7-22. Derive an expression for the final temperature T. of the mixture of

ICE (SOs] = | M CH20] = 2 M • Construct (CE Table Given: %3D Find ko. SO3 6) + H,0 c9) ラH2SO4 ca)

1:4 (vv) piperidine/DMF CF,CO2H Y CH,Cl2 NH H2N. H2N H,N. NH NH2 NH3 NH2 + II II IV Consider the reaction scheme given above. What are products 'X' and 'Y'? O X = II; Y = IV O X = IV; Y = || O X = II; Y = II O X= 1; Y = II

Do 3 and 4 only thank you. I'll upvote

10:29 0. O O ? 86%i AIATS For Two Year Medic. A 62 /180 (02:55 hr min Mark for Review HBr (A) (CH; CO),02 A (predominantly) is Br Br Br Br Br Clear Response III

Provide the answer in the blanks

Review Homework REQUIRED (NOT Pie Progress) Question 18 of 46 (2 points) | Question Attempt: 1 of Unlimited ✓ 14 15 ✓ 16 17 18 19 20 21 ✓ 22 23 Wine goes bad soon after opening because the ethanol (CH3CH2OH) in it reacts with oxygen gas (02) from the air to form water (H2O) and acetic acid (CH3COOH), the main ingredient of vinegar. What mass of oxygen gas is consumed by the reaction of 2.66 g of ethanol? Round your answer to 3 significant digits. 0%

Please answer number 4-8

How do I calculate moles used in this lab from the information in the table?

3. If AH*= 10 kcal/mol and AS = +10 eu, at what temperature will AG = 0? Show your work. %3D

How do I calculate the volume of NaOH solution used in Trail 1

The graph below shows approximate plots of lnP vs. T-1 for three compounds: methanol (CH3OH), methyl chloride (CH3Cl), and propane propane (C3H8), where P is the vapor pressure of the liquid. Match the lines with the compounds. A) A = propane, B = methanol, C = methyl chloride B) A = methyl chloride, B = methanol, C = propane C) A = propane, B = methyl chloride, C = methanol D) A = methanol, B = propane, C = methyl chloride E) A = methanol, B = methyl chloride, C = propane

i need the answer quickly

em 119 My Course X Macmillan: X Course Mo Submit Answer X Sections 5 What is the FORMULA for the limiting reagent? References X age.com/static/nb/ui/evo/index.html?deploymentid=5735112480241329813180832311&elSBN=9781305862883&id=1707786042&snapsh What amount of the excess reagent remains after the reaction is complete? HOMEWOR Use the References to access Important values if needed for this question. For the following reaction, 20.3 grams of carbon dioxide are allowed to react with 39.6 grams of potassium hydroxide. carbon dioxide (g) + potassium hydroxide (aq) potassium carbonate (aq) + water (1) - What is the maximum amount of potassium carbonate that can be formed? MacBook Air X grams MindTap - grams ;

50 Percentage Red No. 40 Soln 100% 80% 60% 40% Table 4.1: Dilutions of Red No. 40 & Absorbance Volume of Red No. 40 Soln (mL) 10me 8mL опи 4mL Percentage Red No. 40 Soln 100% 80% 60% 40% 20% Volume of DI Water (mL) OML 2mL LIML M UML 8ML Table 4.2: Dilutions of Red No. 40 & Absorbance Concentration Red No. 40 2. Report the wavelength with the maximum absorbance of Red No. 40 dye. Absorbance 20% 2ML Part A: Making a Calibration Curve for Beer's Law 1. Calculate the concentrations of each of your diluted Red No. 40 solutions and add these to Table 4.2. Show at least one sample calculation in the space below. 0.251 0.192 Total Volume 0.181 0·119 0.060 (mL) 10 mL 10 mL 10 mL 10 mL 10 mL