double bond
1
4.1
- noun
- /ˈdʌbəl bɑnd/
- Specialized
:
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- In organic chemistry, a double bond forms when two pairs of electrons are shared between two carbon atoms.
- carbon double bonds
Trans fat is a fat that is has a double bond in it that is flipped.
- Trans fat is a fat that is has a double bond in it that is flipped.
- It was because what it did was it lined your liver because you couldn't break that trans double bond.
- It's got leftover a double bond and that's the key.
- And so this, this so, but double bonds don't have that.
- Like once you get to the point where oxidize those double bonds, I mean, now you're, you know, who knows what's happening downstream of that.
Examples
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An example of a double bond can be seen in ethylene, where two carbon atoms share two pairs of electrons.
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But you can also draw the double bond over here, right?
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This would be a double bond or a triple bond.
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That carbon has no double bond, has no triple bond.
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In the presence of a negative ion, the carbon double bond breaks and four single bonds form.
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That's because bleach works well to break double bonds, but the color that comes from rust isn't due to double bonds.
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The number of double bonds identified in these molecules is useful for reconstructing the ancient sea-surface temperature (SST).
Academic text (2002) -
The presence of a double bond in the molecular structure affects the reactivity of the compound.
Surface Forms
Morphology
This is a straightforward modifier+noun composition: 'double' (= twofold) describes the kind of 'bond', so a learner can infer it means a bond involving two (pairs) rather than one. The construction is compositional and common in scientific vocabulary across languages, so a B1 learner who knows both constituents can reasonably derive the intended meaning even without specialized chemistry knowledge.
Etymology
Double bond combines double and bond: imagine two ropes tying two posts together instead of one. That's why it means 'a bond where two connections hold two atoms together', and why molecules with a double bond act differently.