#butene

[dkl9]

(from AN #1391)

[oh-dear-so-queer]

Note that but-2-ene, the major product as predicted by Zaitsev's rule, is obtained as a mixture of cis and trans isomers.

"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.

[whats-in-a-sentence]

Three important points follow from the information in table 16.5.

The reduction of an alkene to an alkane is an exothermic process. This observation is consistent with the fact that, during hydrogenation, there is net conversion from weaker π bonding to stronger σ bonding; that is, one σ bond (H-H) and one π bond (C=C) are broken, and two new σ bonds (C-H) are formed.

The enthalpies of hydrogenation depend on the degree of substitution of the carbon-carbon double bond: the greater the substitution, the lower the enthalpy of hydrogenation. Compare, for example, the enthalpies of hydrogenation of ethene (no substituents), propene (one substituent), but-1-ene (one substituent) and the cis and trans isomers of but-2-ene (two substituents each).

The enthalpy of hydrogenation of a trans alkene is less than that of the isomeric cis alkene. Compare, for example, the enthalpies of hydrogenation of cis-but-2-ene and trans-but-2-ene. Because the reduction of both alkenes gives butane, any difference in their enthalpies of hydrogenation must be due to a difference in relative energy between the two alkenes (figure 16.32). The alkene with the lower (less negative) value of ∆rH° is the more stable alkene. We explain the greater stability of trans alkenes relative to cis alkenes in terms of nonbonded interaction strain. In cis-but-2-ene, the two -CH3 groups are sufficiently close to each other that there is repulsion between their electron clouds. This repulsion is reflected in the larger enthalpy of hydrogenation (decreased stability) of cis-but-2-ene compared with that of trans-but-2-ene.

"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.

[tenth-sentence]

Table 16.5 lists the enthalpies of hydrogenation of several alkenes.

"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.

[rica7yt5d70e]

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[pharmaffiliatesanalytics]

CAS No : 106-98-9 | Chemical Name : 1-Butene | Pharmaffiliates

Buy highly pure 1-Butene, CAS No : 106-98-9, Mol.Formula : C4H8, Mol.Weight : 56.11, from Pharmaffiliates. Login as registered user for prices, availability and discounts.

[apollosimps]

It might just be the funniest shit in the world when transphobes get mad over being called cisgender and the like. You know what I'm talking about--"cis is a slur!" "Why do you need a name for biological men and women?" "I'm not cis, I'm normal" etc etc

The funny thing is, I know quite a bit about chemistry. I was a chem major before I switched to math.

Cis- and Trans- are common prefixes. Take butene for example:

(source)

Same molecule, same atoms. However, the CH3-CH3 and H-H groups are on the same side in the cis isomer and the transverse side in the trans isomer.

In general, trans isomers tend to be more stable than cis isomers because 1) trans isomers have a lesser chance of having a dipole, so they may be less reactive and 2) the molecule is just more balanced/symmetrical.

So, my point is, no. Cis- is not a slur. Cisgender is not the default, as much as transphobes would looooove to believe. They treat trans like a slur when we just use it as a simple descriptor.

[margocooper]

Щитник линейчатый и Бутень ароматный (лат. Chaerophýllum aromáticum).

Striped shield bug (Graphosoma lineatum) and Fragrant buten.

[mx-butterscotch]

Current Mainstream Gender Terminology is Problematic and Erases and Marginalizes the Non-binary Community

Hi peeps!

I understand that a lot of people in the gender-diverse community strongly identify and feel affirmed with the terminology trans and transgender to describe the gender-diverse community and describe one's experiences and feelings of their gender identity, but the terminology for it is problematic. Historically, transgender was primarily associated with the narrow binary framework (e.g., from man to woman or vice versa). Cisgender serves as an antonym to transgender. Transgender expanded beyond the narrow binary framework to include non-binary, but a lot of people within and outside the gender-diverse community still associate it with just trans men and trans women. Even with good intentions, language can and does perpetuate stereotypes and inequality. A lot of mainstream gender-diverse terminology conveys binary ideas of physical characteristics and gender.

The Latin prefixes "cis" and "trans" when used to describe the gender identities cis or cisgender and trans or transgender are inherently problematic because of their binary connotations. The Latin prefix “trans” means “across,” “beyond,” or “on the other side of.” For example, “Transylvania” means “beyond the forest,” and “transatlantic” means “across the Atlantic Ocean.”

The Latin prefix “cis” means “on this side of.” The scientific roots of the “cis-” prefix go even further back. In chemistry, it refers to the orientation of atoms in three-dimensional space. For example, “cis-2-butene” describes a molecule where two methyl groups are on the same side of a double bond, while “trans-2-butene” has the methyl groups on opposite sides.

So here is my idea to address it. What if we removed the Latin prefixes and replaced them with "Ex" and "Intra?"

Exgender ("Ex" meaning "out of" or "from") on its own could be a broad term that can be used to describe people whose gender identity(ies) is different from the gender they were assigned at birth (but ideally use gender-diverse). Instead of trans men, trans women, and trans people, it would be exgender men, exgender women, and exgender people.

Intragender ('intra" meaning "within" or "inside") could be a gender identity that can be used to describe people whose gender identity aligns with the gender they were assigned at birth. Instead of cisgender men, cisgender women, and cisgender people, it would be intragender men, intragender women, and intragender people.

Both intragender and exgender would still have the inclusive definitions associated with cisgender and transgender gender identities and be used in the same way. The difference is they wouldn't unintentionally reinforce the narrow gender binary that disproportionately affects the non-binary community compared to trans men and trans women (of course this depends on certain factors, such as the intersectionality of the fundamental aspects of a person's identity) and contributes to the common and serious issue of non-binaryphobia within the gender-diverse community.

There's also A LOT of other binary terminology that needs to be abolished, such as ASAB, AMAB, AFAB, assigned sex, assigned male, assigned female, FtM, MtF, male, female, sex, "biological" sex, femme-presenting, masc-presenting, masculine, feminine, etc.

A lot of these could be replaced and some just shouldn't be used at all.

Instead of male and female, use man and woman.

Instead of FTM and MTF, use exgender man, exgender woman, exgender person, non-binary person, AGAB, assigned woman at birth, assigned man at birth, etc.

Instead of ASAB, AMAB, AFAB, assigned sex, etc., use AGAB (Assigned Gender At Birth), assigned gender, assigned woman at birth, and assigned man at birth. E.g. My AGAB is woman/man.

Instead of sex and "biological" sex, use physical attributes or descriptive language to describe physical attributes, such as hormones, genitalia (penis, vagina, diverse genitalia), chromosomes, etc.

Instead of masc-presenting, femme-presenting, masculine, feminine, gender-neutral or any other word that labels certain forms of gender expression to be inherent to certain gender identities, use descriptive language.

For example:

Instead of "femme-presenting/feminine" or masc-presenting/masculine chest," use "rounded firm chest" or "flat chest, muscular chest."

Instead of "femme-presenting/feminine" or "masc-presenting/masculine" clothing, use "skirt, dress, lipstick, makeup, bra, t-shirt, baggy shorts, leather jacket, boots, etc."

No aspect of gender expression is inherently tied to any gender identity and shouldn't be falsely labeled as such, and the concepts of masculinity and femininity are baseless social constructs that change over time and often prioritize and favor cis men and marginalize other genders.

[dykes4jamescorden]

i think these posts being right next to each other is funny

[image id: cistranny's blog page. there is a partially cut off portrait of joe biden with cleavage and under that, there is another post that says, "I think I hauve covid <- incredibly high and just saw the most beautiful butch woman in thr world"]

Joe Buten the most beautiful bidch in the world...

[alyanas-little-hideout]

sorry I was just thinking of the 'cis is a slur' bs and

2-c*s-butene

[whats-in-a-sentence]

Figure 16.28 shows such an energy diagram for the two-step reaction of but-2-ene with HCl. (...) Given that the rate-determining step of the reaction in figure 16.28 involves both but-2-ene and HCl as reactants, we would expect the rate law for this reaction to have the form:

rate of reaction = k[but-2-ene][HCl]

and the reaction should display second-order kinetics (see chapter 15).

"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.

[tenth-sentence]

Because of restricted rotation around a carbon-carbon double bond, an alkene in which each carbon of the double bond has two different groups bonded to it shows cis-trans isomerism.

"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.

[p-perkeys]

I always used to think they would make nice friends. I once shipped them. Or at least imagined he’d have a crush on her. Not love, just a boyish crush. I would headcanon Quentin picking on him for it - even though Quentin canonly gave her flowers once.

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One of the many times I reread WIWFIKM by H. Buten, I pictured Evan as Burt and Laura as Jessica.