# All Questions

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### What would be the chemical reaction and equation of the following tests for citrate ion?

A 1:10 solution of sodium citrate is added with excess calcium chloride and heated. Dilute HCl is added to a solution of sodium citrate? A 5mL sodium citrate solution is added with 0.5 mL mercuric ...
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### Change in pressure?

Consider a sample of gas in a fixed volume container . From the arguments of Kinetic Theory of Gases on quadrupling the temperature what will be the effect on pressure . Basically I thought that the ...
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### Why won't ethene and ethyne react with halogens?

With alkanes, a free-radical halogenation (substitution) is observed. I was told that there will be no reaction in a similar situation with ethene and ethyne - and I am having trouble understanding ...
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### chlorobenzene nmr - monosubstituted aromatic ring

I'm trying to solve this unknown organic compound. I know that it is chlorobenzene but I do not understand why the H NMR of the compound only shows one peak.
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### What are some sources of error in the preparation of a standard solution (of sodium carbonate) and a titration (determining the concentration of HCl)?

When preparing a standard solution of sodium carbonate, what are some sources of error? Also, when conducting a titration, what are some errors involved when determining the concentration of ...
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### Potassium tert-butoxide reaction with chloroform and picric acid

If potassium tert-butoxide is used in a solution of chloroform and and a strong protic acid like picric acid will the tert-butoxide ion react with picric acid or will it form a dichlorocarbene. ...
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### Why is Iodine's melting point is lower than water?

My teacher told us that melting point of Iodine is lower than Ice as it is a Simple molecular structure bonded by weak van der waals forces. However I gooogle and found out its melting point is ...
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### Phosphoric Acid Titration

I physics graduate student, but I teach an interdisciplinary lab for the university which incorporates biology, physics, and chemistry. We recently added a weak-acid titration lab to the course and ...
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### What is the reaction between Cyanoacrylates and Cotton?

Basically, if you combine a cyanoacrylate (aka. super glue) with cotton, an exothermic reaction will occur. What i would like to know, is 1) what the formula describing the reaction, and 2) why the ...
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A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.203 g of the compound produced 0.439 g of $\ce{CO2}$ and 0.0898 g of $\ce{H2O}$. In another experiment, 0.169 g of the ...
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### Does freezing tights make them more durable?

Various blog posts and articles suggest that freezing a pair of tights will make them last longer. From a blog named Eclipsed Moon: Put your tights in the freezer. I thought that this was ...
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### Does solid aluminum oxide conduct oxide ions at high temperatures?

Can alumina behave as a solid electrolyte for oxygen ions? Could a cell be constructed with an oxygen cathode and a molten aluminum anode producing more alumina? Would the resulting alumina deposit on ...
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### Why do metals form ions in solution?

I'm looking at redox half-reactions, such as the one below: Zn(s) → Zn2+(aq) + 2 e– Does the zinc react with the water and dissociate into ions? Why doesn't solid zinc have a charge?
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### Melting and boiling point comparison

Graphite,silica and diamond are covalent compounds and still they have high melting and boiling point why ?
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### Bond length comparison between two carbon atoms

Why is the bond length of double and triple bonds between two carbon atoms shorter than the single bond length between two carbon atoms?
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### Determine the order of the reaction, and the value of the rate constant. Predict the concentration of AB at 25s

I've never posted a question about chemistry before so I'm not really sure how this community works but here is the question. I do have the answer to this question but I have no idea on going about ...
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### Reaction of citric acid and calcium chloride

I was planning to extract citric acid from lemon juice by reacting the lemon juice with calcium chloride hoping it would react to form calcium citrate and precipitate according to the reaction ...
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### Froth Flotation Process

why in froth flotation process sulfide ores come with oil in froth layer? I mean is there any type of interaction that develops between them?
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### Does amine inversion affect basic strength?

If I were to compare the basic strength of the following two amines: Can I say that the first amine is more basic than the second because the lone pair of electrons is less available in the second ...
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### If 10 ml of solution with a pH 1 are diluted to 100 ml of new solution, then new pH is? [on hold]

If 10 ml of solution with pH 1 is diluted to 100 ml of new solution, then new pH is? Which is correct answer? A) 10 B) 0.1 C) 2 D) I can't determine
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### Why NaBH4 does not reduce carboxylic acid while LiAlH4 does?

My teacher told - "To reduce carboxylic acid to alcohol, $\ce{LiAlH4}$ is used. But since $\ce{LiAlH4}$ is an expensive reagent, it is commercially reduced by forming an ester and then to alcohol". I ...
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### 1 F of electricity is passed through 10L aq. NaCl Solution. Calculate pH of the solution [on hold]

$1$ F of electricity is passed through $10$ L aqueous $\ce{NaCl}$ solution. Calculate $\ce{pH}$ of the solution. This is an Electrochemistry application problem, I'm not sure how to solve it.
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### Does Reverse Osmosis remove elemental ions from water?

From what I understand, RO is able to remove (or at least considerably reduce) the salts dissolved in water. But thinking about it just doesn't make sense. RO works by filtering the solution using a ...
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### Beer's Law v. Analytical Wavelength Determination

If there are any, what is/are the difference(s) between Beer's Law Plots and Analytical Wavelength Determination Graphs?
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### Which of the following elements cannot bind with Au? [on hold]

I want to know which of the following elements cannot make a bind (connection) with Au ( Gold )? I don't have any knowledge in chemistry but i need to know whether we can say " if we find gold from ...
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### Significant figures addition vs multiplication

I was finding the molecular weight of $\ce{Br2}$ the other day and noticed that if I add the weight of $\ce{Br}$ to itself, $79.90+79.90=159.80$, that answer for the weight has $5$ significant ...
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### Why shouldn't lithium batteries be discharged below 50%?

I know both from online websites and from experience that discharging a li-ion battery below 50% greatly decreases its life and capacity. But why is it so?
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### Chemical expression and terminology

Is this expression correct "the reaction was not accomplished " when we check the final product finding two or more spots on TLC paper ?
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### How to calculate bond angle of simple molecules quantitatively?

Hi I'm new to this forum so spare me if I've made mistakes. Our high school chemistry teacher explained that bond angles of different molecules varies slightly, e.g. 107 degrees in ammonia and 104.5 ...
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### What are other than NMR quantitative methods for analysis of products in thermodynamic and kinetic reaction control? [on hold]

What are other than NMR quantitative methods for analysis of products in thermodynamic and kinetic reaction control? Any help appreciated, thank you.
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### What would the be number of signals, multiplicity and integration in these C4H10O isomers [on hold]

CH3CH2OCH2CH3 -I know this one has two signals Would this have a singlet multiplicity and 0 neighboring Carbons? CH3OCH2CH2CH3 -I know this one has four signals Would this have a singlet, triplet ...
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### Furan's HNMR signals and multiplicity [on hold]

Furan has two signals, right? One for the Ar-C and another for the C=C-H? What I don't know how to do is how to determine their multiplicity, how many H's produce the signal and the H neighbors ...
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### How would isomers of furan affect the NMR spectrum [on hold]

How would the first isomer there be different from
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### Why is the total number of electrons in a neutral carbon atom different from the number of dots in a Lewis Dot structure for carbon?

Lewis Structure has 4 but the neutral atom has 6. why?
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### Etching brass with Sodium Persulfate: disposing biproducts with household waste

I want etching brass plates using sodium persulfate. I am doing this at home, on a low budget, with the most basic chemistry knowledge. I managed to find this article that explains how to process the ...
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### Simple practical, non-toxic, non-flammable reaction for slow release of CO2

Someone I know (not me) has recently had problems with bed bugs. I have advised him his best bet is to (1) Buy a kick-ass steam cleaner and nuke the brutes from orbit, (2) get a professional pest ...
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### Why does amino acid decompose when heated? [on hold]

Why does amino acid decompose when heated? I learnt that carbonic acid tends to decompose especially in the presence of water, why? What causes a species to decompose?
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### design of polymer material with certain properties

I want to know how to design materials(polymer material) with certain properties. - like how the structure effects the properties. - about the mixing of polymers and monomers to get certain material ...
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### Is fluorescence just a special case of molecular relaxation after photon absorption?

A self studier discovers various answers to this question: a photon of exactly the same energy is created within a nanosecond; the energy is dissipated as heat from molecular vibrational states. If an ...
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### Convert benzene to isopropylbenzene

Which of the following reagents will convert benzene to isopropylbenzene? Choose all that are appropriate. I know for certain that (b) can be used, but I also think the following mechanism with ...
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### chemistry reaction gas laws [on hold]

a container has hydogen gas helium gas and methane gas having mass 0.8g and 0.12g respectively at 13 deci metre cube 1 atm and 37 degree atmosphere . what is Ph2,Phe2 and Pch4
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### Is a polycarbonate beer mug appropriate for serving alcohol?

Are polycarbonate & acrylic beer mug, whiskey glasses safe for serving alcohol? I mean does it leach or dissolve? What are the harmful effects in long run if any?
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### Calculating the mass or atomic percentage of a gas mixture [on hold]

Consider the gas mixture $\ce{Ar}:\ce{CF4}:\ce{C4H10}$ with composition $88:10:2$. I want to include this mixture in a simulation package, therefore I have to add the atomic or mass percentage of each ...
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### Non-newtonian Fluid separation

Recently I've been wanting to use a fluid with non-newtonian properties and I chose to start off with the cornstarch and water mix. After hunting around how long this mix lasts without separation/mold ...
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### About the molecule PF4Cl [on hold]

1.Which would you expect to take up more space, a P-F bond or a P-Cl bond? 2.so , how question one do with the molecular geometry of the molecule? 3.Would you expect the molecule to distort from its ...
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### Concentration of solutions of solids in liquids [on hold]

An antifreeze solution is prepared from 222.6 g of ethylene glycol $\ce{C6H6O2}$ and 200 g of water (solvent). Calculate the molarity of the solution.
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### How is this sugar classified as an aldose?

I have made the following image in paint, so forgive me if it isn't the most appealing sugar. I have a hard time visualizing how the following sugar is an aldose. My speculation for the Fischer ...
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### How high in (mmH2O) is the column of water in the tube?

A long glass tube, sealed at one end, has an inner diameter of 23.4mm. The tube is filled with water and inverted into a pail of water. If the atmospheric pressure is 735 mmHg, how high (in mmH2O) is ...