Alejandro L.

03/30/17

Gas Laws Chemistry Question

how to find the number of miles of hydrogen gas collected when you are told...that the volume is 90.0 mL, the temperature is 25 degrees Celsius, the atmospheric pressure is 745 mm Hg, and that the... more

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Organic Chemistry

03/25/17

Organic reaction

Can anybody provide the mechanism of the reaction . The reaction is on http://pasteboard.co/NFE9lpVli.jpg

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Chemistry Organic Chemistry Chemistry Lab

02/27/17

How do I tell the difference with an IR spectrum of 2-hexanol and 1-hexanol?

It seems like the OH peak is less intense on 2-hexanol...why?

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Organic Chemistry

02/24/17

Multi-Step Synthesis

Convert acetylene to hexanoic acid justifying why each step is taken.

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Chemistry Water Concentration

02/23/17

Help me with this. My answer is not coming

The values of Ksp of CaCO3 and CaC2O4 are 4.7 × 10–9 and 1.3 × 10–9 respectively at 25°C. If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in water?

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Chemistry

02/22/17

Temperature

At 0 degrees celcius the tempe doesn't change even though 80 kcal is added, why doesn't the temperature change?

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Answers •1

Chemistry Stochiometry

02/22/17

1 mole CaCI2 / 40.08 g Ca + 70.9 g CI2 * 89.3 g CaCI2 / 1 = ?

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Answers •1

Chemistry Organic Chemistry Chemical Reactions

02/11/17

Synthesis of Physostigmine

I am trying to break down the synthesis of Physostigmine. In steps 9 and 10 in this synthesis picture https://en.wikipedia.org/wiki/Physostigmine#/media/File:Julian_synthesis.gif, how is the Et... more

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Chemistry

01/05/17

we live in an atmosphere of 21% oxygen. Life on earth would be very different if the oxygen concentration were twice as high, what are four difference

chemistry and society

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Organic Chemistry Mass Spectroscopy Introduction To Spectroscopy

12/15/16

Fragments for the peaks in mass spectrometry of tributylamine.

Fragments for the peaks in mass spectrometry of tributylalmine The above mentioned compound with mw=185. Write the reaction mechanisms and structures to account for the peaks at the following... more

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Biochemistry Organic Chemistry Nutrition

12/12/16

Do unsaturated fatty acids with an odd number of carbon atoms in their chain exist in nature (for example C21:3)?

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Chemistry

11/26/16

What mass of chlorine gas is produced by the reaction of 1.26g of ammonia perchlorate?

Ammonia perchlorate (NH4CIO4) is solid rocket fuel. It reacts with itself to produce nitrogen gas (N2), chlorine gas (Cl2), oxygen gas (O2) water (H2O) and a great deal of energy. What mass of... more

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Chemistry Enthalpy Ionization

11/26/16

Ionization energy doubt

What is negative and positive ionization enthalpy?

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Chemistry Conversion General Chemistry

11/25/16

Finding how high a column of water in meters can be with the density of water and mercury

I'm struggling to understand what the question is asking me and what concepts it is trying to test... If the density of water is 1.00g/mL and the density of mercury is 13.6g/mL, how high a... more

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Chemistry

11/23/16

How do you identify 3 bonding types?

My teacher geme me homework but I need help with this question

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Answers •2

Chemistry Periodic Table

11/15/16

Periodic Table related doubts

If the ionic radii of each K+ and F– are 1.34Å, then the atomic radii for K and F will be

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Answers •1

Chemistry Organic Chemistry Organic

11/14/16

Calculate the experimental specific rotation (°) of the equilibrium mixture of α- and β-lactose

Calculate the experimental specific rotation (°) of lactose at time equals zero (t = 0)=87Enter the observed rotation of the equilibrium mixture of α- and β-lactose (°)=5.2 Calculate the... more

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Organic Chemistry

11/14/16

why sulphuric acid is used as catalyst in primary alchols but not in secendary and tertiory alchols.. why? give reason.

i need just reason .. that why shulphuric acid is only used in primary alchols as a catalyts and not in other secondary or tertiory alcholos

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Answers •2

Chemistry Plots Light Absorbtion

11/12/16

Beers Law plot

I had to constructed a Beers Law plot for my graph (absorbance vs. concentration) I'm supposed to find the molar extinction coefficient from the slope. Well the slope of the line is... more

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Chemistry Light Absorbtion Chemistry Lab

11/12/16

Spectrophotometric lab

A test for drug use involves addition of 10.00mL of colorless reagent to 10.00 mL urine. If drug residue is present in the sample the solution turns blue(λmax = 605 nm, ε = 18,200M-1cm-1). Because... more

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Chemistry

11/11/16

i need the products of this equation . sodium thiosulfate + iodine ??

i had a chemistry lab last week and i need to know the product of this equation thiosulfate + iodine ??

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Answers •1

Chemistry Class Homework

11/08/16

Is HCL plus K2S = KCL plus H2S an acid base reaction?

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Answers •1

Chemistry Word Problem Theoretical

11/06/16

Percent yield & Limiting reagent

If a students adds three times as much phenanthroline than she was supposed to when attempting the red crystal synthesis how does this effect the actual, theoretical and percent yield?

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Answers •1

Chemistry College Chemistry

11/05/16

Chemistry Question

Using experimental values, place the first ionization energies in order from least amount of energy to greatest amount of energy input required: sodium, silicon, magnesium, aluminum

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Chemistry General Chemistry

11/04/16

When the following solutions are mixed together, what precipitate (if any) will forms? Write the reaction equation for all the cases and write the net ionic equ

When the following solutions are mixed together, what precipitate (if any) will forms? Write the reaction equation for all the cases and write the net ionic equation for only those reactions that... more

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Gas Laws Chemistry Question

Organic reaction

How do I tell the difference with an IR spectrum of 2-hexanol and 1-hexanol?

Multi-Step Synthesis

Help me with this. My answer is not coming

Temperature

1 mole CaCI2 / 40.08 g Ca + 70.9 g CI2 * 89.3 g CaCI2 / 1 = ?

Synthesis of Physostigmine

we live in an atmosphere of 21% oxygen. Life on earth would be very different if the oxygen concentration were twice as high, what are four difference

Fragments for the peaks in mass spectrometry of tributylamine.

Do unsaturated fatty acids with an odd number of carbon atoms in their chain exist in nature (for example C21:3)?

What mass of chlorine gas is produced by the reaction of 1.26g of ammonia perchlorate?

Ionization energy doubt

Finding how high a column of water in meters can be with the density of water and mercury

How do you identify 3 bonding types?

Periodic Table related doubts

Calculate the experimental specific rotation (°) of the equilibrium mixture of α- and β-lactose

why sulphuric acid is used as catalyst in primary alchols but not in secendary and tertiory alchols.. why? give reason.

Beers Law plot

Spectrophotometric lab

i need the products of this equation . sodium thiosulfate + iodine ??

Is HCL plus K2S = KCL plus H2S an acid base reaction?

Percent yield & Limiting reagent

Chemistry Question

When the following solutions are mixed together, what precipitate (if any) will forms? Write the reaction equation for all the cases and write the net ionic equ

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