Asked by: Djily Eulalia
science genetics

What is the density of Dibenzalacetone?

Last Updated: 24th April, 2021

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Predicted data is generated using the ACD/Labs Percepta Platform - PhysChem Module
Density: 1.1±0.1 g/cm3
Flash Point: 176.1±20.6 °C
Index of Refraction: 1.650
Molar Refractivity: 77.6±0.3 cm3
#H bond acceptors: 1

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Similarly, why is Dibenzalacetone yellow?

Pure dibenzalacetone is a pale-yellow solid that does not dissolve in water, but dissolves in ethanol. This is because it's a symmetrical, non-polar molecule. dba is often mentioned in organic chemistry classes, to show how it's created in a reaction with benzaldehyde + acetone.

Similarly, what is the melting point of Dibenzalacetone? In the synthesis of dibenzalacetone by aldol condensation of acetone with benzaldehyde1 the primary product melts at 110-112° C and has a intense uv absorption at 330 nm. Two other isomers are known.

Also to know is, why does Dibenzalacetone absorb UV light?

This is because dibenzalacetone absorbs UV light and helps to protect the skin from the sun's damaging rays. The properties that are most valuable in a compound that is used in sunscreen are the compound's abilities to absorb, reflect, or even scatter the harmful UV rays.

How do you make Dibenzalacetone?

Procedure:

  1. Take a conical flask add 10ml freshly distilled benzaldehyde and 20ml of acetone.
  2. Place the flask in cold water bath and then add 2.5ml sodium hydroxide dropwise with constant stirring.
  3. Maintain the temperature at 30oC.
  4. After the complete addition of sodium hydroxide stir the mixture for 2 hours.

Related Question Answers

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Is Dibenzalacetone polar?

Is dibenzalacetone polar or nonpolar? It is beautiful, symmetrical, and totally conjugated. All of the bonds are non-polar execept the carbon oxygen bonds which are polar due to the differential in electronegativity between carbon and oxygen. So the short answers that the molecule is polar.

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How can you tell if UV is active?

To be UV-active compounds must possess a certain degree of conjugation, most commonly aromatic compounds. One can then outline the spots with a pencil, while under the UV light, to mark their location. Staining the spot by chemical means is a second method of visualization.

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Do double bonds absorb UV light?

The 1,3,5-heptatriene, having only three conjugated double bonds does not absorb in the visible portion of the spectrum and thus appears as being colorless. Its electrons can however be excited to a higher energy state by the absorption of the much higher energy ultraviolet light.

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What is lambda max?

Lambda max refers to the wavelength along the absorption spectrum where a substance has its strongest photon absorption. Scientists can then use lambda max as a parameter to compare the different qualities of all types of molecules and substances.

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Why do molecules absorb light?

Different molecules will absorb different wavelengths of light. Absorption of light starts with energy of a certain wavelength in this UV-visible region being exposed to a molecule. The light/energy then excites the ground state (non excited) outer or valence electrons to an excited state (high energy).

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What color absorbs UV light?

The best color shades for UV protection
One study looked at cotton fabrics that were died in very deep hues. Lighter shades, like yellow, tend to be relatively ineffective when it comes to be absorbing UV light. On the other hand, darker shades, like red and blue, are much better at absorbing UV rays.

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Which compound absorbs UV light at a longer wavelength?

The longer the conjugated system, the longer the wavelength of the light absorbed. Ethylene absorbs light of wavelength in the far ultraviolet part of the spectrum, at 180 nm. Butadiene, with two conjugated double bonds, absorbs at 217 nm, a wavelength closer to the visible zone than that absorbed by ethylene.

Raheela Sadik

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Why is maximum wavelength important?

The higher the absorbance of light by a solution, the lower the percent transmittance. The wavelength at which absorbance is highest is the wavelength to which the solution is most sensitive to concentration changes. This wavelength is called the maximum wavelength or λmax.

Nandi Vasyaev

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Why do aromatic compounds absorb UV?

“achievement Molecules containing π-electrons or non-bonding electrons (n-electrons) can absorb the energy in the form of ultraviolet or visible light to excite these electrons to higher anti-bonding molecular orbitals. The aromatic rings are composed of pi bonds that absorb UV light.

Derly Wried

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How many stereoisomers of Dibenzalacetone are possible?

Ernest Z. The three isomers of dibenzalacetone are cis-cis, cis-trans, and trans-trans.

Leisha Czok

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Why is melting point important in organic chemistry?

The melting point is an important physical property of a compound. The melting point can be used to identify a substance and as an indication of its purity. The melting point of solid is defined as the temperature at which the solid exists in equilibrium with its liquid under an external pressure of one atmosphere.

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How do you find theoretical yield of Dibenzalacetone?

Theoretical yield of dibenzalacetone: 1.1 mol . 1 mol 1 mol . 234.30 1 mol = 0.234 g actual theoretical = ¿ 0.273 g 0.234 g . 100 = 116.66 Conclusion: Our final product mass of dibenzalacetone was 0.273g.