saynntan

Wine goes bad soon after opening because the ethanol (CH₃CH₂OH) in it reacts with oxygen (O₂) from the air to form water (H₂O) and acetic acid (CH₃COOH), the main ingredient of vinegar

What mass of acetic acid is produced by the reaction of 1.6 g of oxygen gas ?

Be sure your answer has the correct number of significant digits

Aqueous sulfuric acid will react with solid sodium hydroxide toproduce aqueous sodium sulfate and liquid water . Suppose 6.9 g ofsulfuric acid is mixed with 3.92 g of sodium hydroxide. Calculatethe maximum mass of sodium sulfate that could be produced by thechemical reaction. Round your answer to significant digits.

When a 9.55 g sample of solid sodium hydroxide dissolved in100.0 g of water in a Styrofoam cup calorimeter, the temperaturerises from 23.6 oC to 47.4 oC.

a) What is ∆H for the process in this experiment?

b) What is the molar enthalpy of solution for sodiumhydroxide?

Calculate the [H ] and pH of a 0.000413 M hydrazoic acid solution. Keep in mind that the Ka of hydrazoic acid is 2.20

Answer the following questions:

1. Describe the experiments that need to be done in order to determine the LD50 and what a chart would look like (sketch this out and label axes and important points)

1. An LD50 value is the best measure available to indicate the potential for a compound to cause harm, to be toxic. However, there are six limitations that we looked at and explained. Below, using your own words, name each of these limitations and explain in detail (and with an example/scenario if possible) why it’s a limitation.

In what ways has the evolution of technology impacted the way people communicate and maintain relationships, and what are some potential long-term consequences of these changes?

16 Python Tutorial for Beginners | Import Math Functions in Python

Telusko

Devin [UNK] in Python, we have a lot of modules to work with now. This modules are by default not dead for you now. If you want to use them, you need to ask for it right. in Python, you can import a module with the help of input of course, and then you have to mention a module name here called mac so math is a module. flow will always give a last the least value and c it will give you the highest value highest integer. So likewise we can do factorial we can find Sine x cos x you know all your mathematical functions it 's like that is one more. We also have power you know p or w. in that case, if you want to use m we probably need to use a concept of allies what it means so in the input matt say. As m. will point matt dot b i and that 's your pi value right so we have some more values there. We can also get the value of epsilon..

There are so many functions available so just go to documentation. In fact, we 'll search here. the best way to learn something is to do some research right so it 's 1-0-2 4 that's why it's actually right answer so it works you know it works..

Balance the following equations, include charges and states of matter. Also, find the full and net ionic.

1- NaI(aq)+MgSO4(aq)

2-NaI(aq)+MgNO3(aq)

3- Pb(NO3)2+HCl(aq)

4- NaOH(aq)+HCl(aq)

5-BaCl2(aq)+MgSO4(aq)

6-BaCl2(aq)+H2SO4

7- NH4OH(aq)+H2SO4(aq)

8- MgSO4(aq)+Zm(NO3)2

9- BaCl2(aq)+Cu(NO)2

10-Cu(NO3)2(aq)+NaOH(aq)

11- FeCl3(aq)+AgNO3(aq)

Thank you!

What are the ionic and net ionic equations of these formulas of reactants? Please include the charges and state of matter for each chemical. (If you could get me these answers within 3 hours as of now, I will give lots of points! More for the fastest response!) I know some of these have no reactions, but I still need the ionic equation and net ionic equations. 1) KOH (aq) + NA3PO4 (aq) 2) AgNO3 (aq) + HCl (aq) 3) AgNO3 (aq) + Na3PO4 (aq) 4) Cu(NO3)2 (aq)+Na3PO4 (aq) 5) 2FeCl3 (aq)+3Na2CO2 (aq) 6) 2FeCl3 (aq) + Na3PO4 (aq)

Below are the formulas of some hydrates. What is the mole ratio of salt to water?

1) Na2SO4.10H2O

2) Co(NO3)2.6H2O

3) Mo(NO3)2.5H2O

4) CaSO4.2H2O

5) (CaSO4)2.H2O

I know the below are the answers but how do you solve it??? can someone walk me through to solving this problem other than giving me the answers.

1) 1:10
2) 1:6
3) 1:5
4) 1:2
5) 1:1

Define the following frameworks in research and cite references:

1. Theoretical Framework

2. Conceptual Framework

Below are the formulas of some hydrates. What is the mole ratio of salt to water?1) Na2SO4.10H2O2) Co(NO3)2.6H2O3) Mo(NO3)2.5H2O4) CaSO4.2H2O5) (CaSO4)2.H2O

what is the mole ratio of salt and water of hydrate Na2SO4• 10H2O

You are going to design an application for the clerks to help them with the amount of money they need to pay back to the customers as their change.

Your program needs to have two numbers as the inputs, the first one is the cost of the purchase and the second one is the amount of money the customer pays.

The available coins are 1 dollar, 25 cents, 10 cents, 5 cents, and 1 cent.

The output of your program is how many of each of these coins must be paid back to the customer.
You need to write a program in C programming language.

Any way to summarize this is simple as possible?

The first consideration in purifying a solid by recrystallization is to find a suitable solvent. There are four important properties that you should look for in a good solvent for recrystallization.

1. The compound should be very soluble at the boiling point of the solvent and only sparingly soluble in the solvent at room temperature. This difference in solubility at hot versus cold temperatures is essential for the recrystallization process. If the compound is insoluble in the chosen solvent at high temperatures, then it will not dissolve. If the compound is very soluble in the solvent at room temperature, then getting the compound to crystallize in pure form from solution is difficult. For example, water is an excellent solvent for the recrystallization of benzoic acid. At 10°C only 2.1 g of benzoic acid dissolves in 1 liter of water, while at 95 °C the solubility is 68 g/L.

2. The unwanted impurities should be either very soluble in the solvent at room temperature or insoluble in the hot solvent. This way, after the impure solid is dissolved in the hot solvent, any undissolved impurities can be removed by filtration. After the solution cools and the desired compound crystallizes out, any remaining soluble impurities will remain dissolved in the solvent.

3. The solvent should not react with the compound being purified. The desired compound may be lost during recrystallization if the solvent reacts with the compound.

4. The solvent should be volatile enough to be easily removed from the solvent after the compound has crystallized. This allows for easy and rapid drying of the solid compound after it has been isolated from the solution.

Can someone please look over my short paragraph about my organic laboratory experiment for any edits on making it more detailed yet concise at the same time. For example, I'm not sure if I should include that acetonitrile and toluene should be stated that they were insoluble compared to the other three solvents just for claification?

The purpose of this second laboratory experiment was to determine a proper solvent for recrystallization of acetaminophen by using the solubility properties in five different solvents: acetonitrile, methanol, tetrahydrofuran, toluene, and acetone. Acetaminophen was insoluble in toluene at room temperature and at elevated temperatures. On the other hand, the compound was also found to be insoluble in acetonitrile at room temperature but soluble at warm temperatures. This observation led to recrystallization of acetaminophen afterwards, and thus would make acetonitrile a suitable solvent.

Can someone please edit (grammar wise) my short lab report for organic chemistry. I didn't get any data for the first experiment which is not good, so I really want to make sure that at least I have a good explanation. My professor still wants it concise but also clear.

The purpose of this laboratory experiment was to learn the technique of recrystallization by purifying benzoic acid from water. Theoretically, approximately 14 mL of room temperature water would dissolve the benzoic acid; however, the solid did not fully dissolve even after the addition of 55 mL. Due to possible systemic error, this indicates that potentially more than 1.0 g of benzoic acid was added to the flask. Therefore, no percent recovery and melting point could not be obtained for purifying benzoic acid.

The purpose of the second laboratory experiment was to determine a proper solvent for recrystallization of acetaminophen by using the solubility properties in five different solvents: acetonitrile, methanol, tetrahydrofuran, toluene, and acetone. Acetaminophen was only insoluble in toluene and acetonitrile at room temperature, but soluble in acetonitrile at warm temperature, which led to a confirmation of recrystallization of acetaminophen. On the other hand, acetaminophen was still insoluble with extra toluene at warm temperature. From these observations, acetonitrile would be a suitable solvent for recrystallization of acetaminophen.

Advertisers do this to you all the time: They make their product seem -- maybe only for a few crucial moments --like something you really have to have.

In this discussion post, you have a chance to get in on this action.

Think of a product people don't need, but buy all the time.
Ideally, it'll be something odd and totally unnecessary for our daily lives.
Think about the rhetorical tools you have at your disposal, specifically ethos, logos and pathos.

You can use an existing item or create a product of your own.

Briefly describe the product to your reader (about a paragraph)

Write a 1-2 paragraph "commercial" in which you use one of the appeals (pathos, ethos, or logos) to sell us something we don't need.

Then write a second "commercial" - - again 1-2 paragraphs-- based on a different appeal, trying to sell us the same product.

You only need to write two, not three, so pick which appeals you want to use. Try to stick to one appeal per paragraph...avoid Blendos for this exercise, if
you can.

IMPORTANT: DO NOT TELL THE READER WHICH APPEAL YOU ARE USING. THEY ARE SUPPOSED TO FIGURE IT OUT.

Help PLEASE ☺️

Advertisers do this to you all the time: They make their product seem -- maybe only for a few crucial moments --like something you really have to have.

In this discussion post, you have a chance to get in on this action.

Think of a product people don't need, but buy all the time.
Ideally, it'll be something odd and totally unnecessary for our daily lives.
Think about the rhetorical tools you have at your disposal, specifically ethos, logos and pathos.

You can use an existing item or create a product of your own.

Briefly describe the product to your reader (about a paragraph)

Write a 1-2 paragraph "commercial" in which you use one of the appeals (pathos, ethos, or logos) to sell us something we don't need.

Then write a second "commercial" - - again 1-2 paragraphs-- based on a different appeal, trying to sell us the same product.

You only need to write two, not three, so pick which appeals you want to use. Try to stick to one appeal per paragraph...avoid Blendos for this exercise, if
you can.

IMPORTANT: DO NOT TELL THE READER WHICH APPEAL YOU ARE USING. THEY ARE SUPPOSED TO FIGURE IT OUT.

I really need help with this

So, I did Triphenylmethanol and Benzoic Acid lab experiment. I started with 1.4918g. Mass after experiment was 0.168g. My melting point recorded was 105.2- 117.0.

After that, I did recrystallization by re-dissolving my crude product in warm water. After everything, I discovered my pure product to be 0.0162. My melting point was 96.5-104.9. 1. Why is my second melting point low? 2. What is the theoritical and percentage yield. 3. how does the instrumental analyses inform the product purity?

So, I did Triphenylmethanol and Benzoic Acid lab experiment. I started with 1.4918g. Mass after experiment was 0.168g. My melting point recorded was 105.2- 117.0.

After that, I did recrystallization by re-dissolving my crude product in warm water. After everything, I discovered my pure product to be 0.0162. My melting point was 96.5-104.9. 1. Why is my second melting point low?

2. Write a balanced equation for the reaction of benzoic acid with sodium hydroxide. Why do you need to extract the ether layer with sodium hydroxide?

3. A possible side reaction during this reaction is the reaction of the Grignard reagent and water. Write a balanced equation for this reaction.

4. Theoretical and percent yield

5. Mechanism of the reaction

this is the procedure......

Procedure (Preparing Grignard reagent):

A 20 mL round bottom flask, two 5 mL conical vials, a 50 mL Erlenmeyer flask, a Claisen head, a syringe, and a Pasteur pipet are all cleaned with acetone and oven-dried to remove all traces of water

A drying tube with anhydrous calcium chloride is prepared.

0.15 g of shiny magnesium turnings are placed in the round bottom flask along with a dry magnetic stir bar.

The apparatus is set up as shown in the text and sealed to keep out air.

20 mL of anhydrous diethyl ether is added to the Erlenmeyer flask and stoppered.

0.70 mL of bromobenzene is placed into a preweighed conical vial and reweighed to determine the mass.

4.0 mL of anhydrous ether is added to the same conical vial.

Once the bromobenzene dissolves, 0.8 mL of the solution is removed with a syringe and the vial capped.

The bromobenzene solution is added to the magnesium in the round bottom flask.

The flask is heated just above the hot plate to about 60°C, with gentle stirring.

Bubbles should be noticed coming from the metal surface, marking the start of the reaction.

If the reaction doesn’t start, a glass stirring rod is used to crush the magnesium against the bottom of the flask. This may be repeated as necessary.

If the reaction still doesn’t start, a small iodine crystal can be added to the flask and the reaction heated again.

When the reaction has started, the solution should turn brownish-gray and cloudy.

More of the bromobenzene is added slowly over about 15 minutes until it has all been added.

Procedure (Benzoic Acid):

The phenylmagnesium bromide is cooled to room temperature and quickly transferred to a beaker containing 4 g of crushed dry ice.

The flask is rinsed with 2-3 mL of anhydrous ether, which is then also added to the beaker.

The reaction allowed to stand, covered with a watch glass, until the dry ice has sublimed.

The Grignard addition compound will appear as a viscous glassy mass.

10 mL of 6M hydrochloric acid is added slowly to the beaker, while stirring.

If a solid is still present, a small amount of ether can be added.

If the solid will not dissolve in the ether, a small amount of 6M hydrochloric acid can be added.

As a last resort, water may be added to attempt to dissolve any remaining solid.

The contents of the beaker, except for any residual magnesium, are transferred to a separatory funnel using a Pasteur pipet.

The beaker is rinsed with ether, which is also pipetted into the funnel.

The lower aqueous layer in the funnel is removed and discarded.

4 mL of 5% sodium hydroxide solution is added to the funnel and shaken.

The layers are allowed to separate and the lower aqueous layer is removed and saved in a new beaker.

The remaining ether phase is shaken with a second 4 mL portion of 5% sodium hydroxide and the lower aqueous layer removed and combined with the first.

Repeat previous step again.

The combined extracts are heated with stirring, hot enough to boil for about 5 minutes.

The solution is cooled and 5 mL of 6M hydrochloric acid is added.

The solution is further cooled in an ice bath.

The solids of this crystallization are collected by vacuum filtration.

The solids are allowed to dry and weighed in order to be able to calculate percent yield.

This crude product is dissolved in a small amount of hot water and then allowed to cool slowly.

Once it reaches room temperature, the flask is placed in an ice bath to complete crystallization.

The solid is once more collected by vacuum filtration and allowed to dry completely.

If desired, the IR spectrum of the product can be completed.

Am talking about the second melting point. Thanks!

Student Polyester wants to synthesize triphenylmethanol by a condensation reaction between a ketone (benzophenone) and a Grignard reagent (phenylmagnesium bromide). Carefully she cleaned the 1.0-mL syringe with H₂O just before the addition of the ethereal solution of benzophenone to the phenylmagnesium bromide. The syringe was not properly dried and had a copious quantity of H₂O in it during the transfer of the ethereal benzophenone solution to the freshly prepared Grignard reagent.

1.Predict all three products of this experiment.

2.Why is it important that all the equipment used in the Grignard formation be completely dry?

3.Name the major undesired side-product formed in the Grignard reaction in this experiment in the absence of water.

4.You will perform the same experiment as Polyester following your handout procedure.

a.What is the purpose of adding hexane to the crude product obtained after evaporation of the ether?

b.What product would be formed if acetone were added to the Grignard reagent instead of benzophenone?

c.If you had leftover benzophenone in your sample, how would the product melting point be affected?

d.How can the IR spectrum be used to tell whether any leftover benzophenone was present in your product sample?

A ketone and a Grignard reagent react in ether solution followed by acid workup, to form a tertiary alcohol. Grignard reactions must be scrupulously dry in order to work effectively. A common method of drying glassware is to rinse with acetone prior to use. Why is rinsing with acetone not suitable for the reaction stated in the question.

a)Magnesium does not dissolve in acetone.

b)Water dissolves in acetone. Adding acetone will add water to the reaction flask.

c)Magnesium dissolves in acetone. Adding acetone will remove a vital reactant from the flask.

d)Acetone is a ketone. Grignard reagents will react with acetone to make an unwanted byproduct.

1. The glassware that is to be used for a Grignard reaction is washed with water and acetone, and dried thoroughly before the reaction is to be performed. Select the most likely reason why.

a. Acetone is needed to react with the silanol groups on the surface of the glassware.

b. The acetone adheres to the sides of the glassware as it dries, and it catalyzes the formation of the Grignard reagent.

c. Grignard reactions are highly endothermic, and residual water will freeze during the reaction.

d. If the glassware is not completely dry, residual water or acetone will react with the Grignard reagent.

2. A Grignard reaction is to be performed in diethyl ether solvent. Select the appropriate grade of diethyl ether for a Grignard reaction.

a. anhydrous grade

b. spectroscopy grade

c. ACS grade

d. technial grade

3. Crude triphenylmethanol was recrystallized using a 2:1 mixture of hexane:ethanol. Select the most likely reason why this recrystallization solution was chosen over pure ethanol.

a. Formation of triphenylmethanol crystals in the presence of pure ethanol is rapid, resulting in lower purity.

b. Triphenylmethanol is very soluble in pure ethanol and its recovery during recrystallization would be low.

c. Hexane stabilizes the phenyl groups of triphenylmethanol, protecting it from decomposition in the presence of heat.

d. Triphenylmethanol is relatively insoluble in pure ethanol, and not enough of it would dissolve for a recrystallization.

4. Which of the following is NOT a reason why heating a reaction mixture directly on the surface of a hot plate can be problematic?

a. Hot plates can heat glassware unevenly, which can lead to stress and cracking.

b. It is difficult to measure and maintain the temperature of a reaction when using the common, traditional style of hot plate.

c. Flammable solvents with low boiling points may ignite.

d. Hot plates cannot heat above 200 °C.

5. A Grignard reaction is performed by heating phenylmagnesium bromide and benzophenone under reflux in diethyl ether. Given that diethyl ether boils at 35 °C and benzophenone boils at 305 °C, select the appropriate temperature for the reflux.

a. 35 C

b. 25 C

c. 305 C

d. 100 C

I want to separate a mixture of Iodine, Potassium Bromide, Aluminum Oxide, and Iron. I have seen that Iron powder can be separated by using a magnet, but I need to be able to perform the experiment another way because this is concidered unavaiable to me in the lab. What I have so far is...

Iodine is best sublimated and is easily soluble in Diethyl Either, slightly soluble in hot/cold water

Iron is insoluble in hot/cold water, and Diethyl Ether

Potassium Bromide is easily soluble in hot/cold water, slightly soluble in Diethyl Ether (preference towards the boiling water since Aluminum Oxide is insoluble in hot water)

Aluminum Oxide is slightly soluble in cold water, insoluble in hot water, "practically" insoluble in non-polar organic solvents

Diethyl Ether is considered a polar organic solvent

How should I go about seperating this mixture with my limitations?

So in my Organic Chemistry lab i had to test the solubilities of 8 different organic compounds using 6 solvents, gettng 48 points in total ( having to say if each is soluble, slightly soluble, or insoluble), and then it asks me to design a procedure that could be used to seperate a three component mixture that contains an organic acid, a phenol, and a neutral compound.
Can u give me more insight into how my data for my experiment could be used to come with such a procedure, I know the three parts of the mixture would be seperated solubility wise but I dont understand how to connect my data for come up with a procedure, could u give me a theoretical understanding of how to do that?