The Arrhenius definition states that acids are substances which increase the concentration of hydronium ions ( H < sub > 3 </ sub > O < sup >+</ sup >) in solution.

An Arrhenius acid is a substance that increases the concentration of the hydronium ion, H < sub > 3 </ sub > O < sup >+</ sup >, when dissolved in water.

: H < sub > 2 </ sub > O ( l ) + H < sub > 2 </ sub > O ( l ) H < sub > 3 </ sub > O < sup >+</ sup >( aq ) + OH < sup >−</ sup >( aq )

In pure water the majority of molecules exist as H < sub > 2 </ sub > O, but a small number of molecules are constantly dissociating and re-associating.

Note that chemists often write H < sup >+</ sup >( aq ) and refer to the hydrogen ion when describing acid-base reactions but the free hydrogen nucleus, a proton, does not exist alone in water, it exists as the hydronium ion, H < sub > 3 </ sub > O < sup >+</ sup >.

Both theories easily describe the first reaction: CH < sub > 3 </ sub > COOH acts as an Arrhenius acid because it acts as a source of H < sub > 3 </ sub > O < sup >+</ sup > when dissolved in water, and it acts as a Brønsted acid by donating a proton to water.

There appeared to be no difference in the distribution of anti-A and anti-B activity in group O serum, though in two group O donors ( J. F. and E. M. ) only one type of agglutinin was found in the regions of low anionic binding capacity ( Figs. 1 and 2 ).

A sample of Fraction Af from group O plasma was dissolved in starting buffer, dialyzed against this buffer and subjected to chromatography using the gradient shown in Fig. 2.

Brackets indicate concentration, such that means the concentration of H < sub > 2 </ sub > O.

Antimony is stable in air at room temperature, but reacts with oxygen if heated to form antimony trioxide, Sb < sub > 2 </ sub > O < sub > 3 </ sub >.

Only a limited number of actinium compounds are known including AcF < sub > 3 </ sub >, AcCl < sub > 3 </ sub >, AcBr < sub > 3 </ sub >, AcOF, AcOCl, AcOBr, Ac < sub > 2 </ sub > S < sub > 3 </ sub >, Ac < sub > 2 </ sub > O < sub > 3 </ sub > and AcPO < sub > 4 </ sub >.

An amide is a compound with the functional group R < sub > n </ sub > E ( O )< sub > x </ sub > NR '< sub > 2 </ sub > ( R and R ' refer to H or organic groups ).

The term amide refers both to classes of compounds and to the functional group ( R < sub > n </ sub > E ( O )< sub > x </ sub > NR '< sub > 2 </ sub >) within those compounds.

The ensemble is generally represented as RC ( O ) NH < sub > 2 </ sub >.

Closely related and even more numerous are amides derived from primary amines ( R ' NH < sub > 2 </ sub >) with the formula RC ( O ) NHR '.

* The single verse, 2 Samuel 18: 33, regarding David's grief at the loss of his son (" And the king was much moved, and went up to the chamber over the gate, and wept: and as he went, thus he said, O my son Absalom, my son, my son Absalom!

For some elements, allotropes have different molecular formulae which can persist in different phases – for example, two allotropes of oxygen ( dioxygen, O < sub > 2 </ sub > and ozone, O < sub > 3 </ sub >), can both exist in the solid, liquid and gaseous states.

After the acceptance of Avogadro's hypothesis in 1860 it was understood that elements could exist as polyatomic molecules, and the two allotropes of oxygen were recognized as O < sub > 2 </ sub > and O < sub > 3 </ sub >.

As an example of different chemical behaviour, ozone ( O < sub > 3 </ sub >) is a much stronger oxidizing agent than dioxygen ( O < sub > 2 </ sub >).

# H < sub > 3 </ sub > O < sup >+</ sup >( aq ) + Cl < sup >−</ sup >( aq ) + NH < sub > 3 </ sub > → Cl < sup >−</ sup >( aq ) + NH < sub > 4 </ sub >< sup >+</ sup >( aq )

The species that gains the electron pair is the Lewis acid ; for example, the oxygen atom in H < sub > 3 </ sub > O < sup >+</ sup > gains a pair of electrons when one of the H — O bonds is broken and the electrons shared in the bond become localized on oxygen.

As the headliner, Lenny Kravitz got to play the venue a second time, with Jorge Benjor, Macy Gray, O Rappa and Pharrell as the main opening acts, on October 2, 2009, 100, 000 people filled the beach for a huge beach party as the IOC announced Rio would be hosting the 2016 Olympics.

Wilco, Arcade Fire, The Mars Volta, Motörhead, Sloan, P. O. D., Joe Satriani, Cradle of Filth, Theory of a Deadman, Our Lady Peace, In Flames, Lifehouse, Children of Bodom, Bring Me the Horizon, Testament, DragonForce, Opeth, GWAR and Switchfoot are just some of the bands that have played at the venue.

He is also one of the group which founded the short-lived Lincoln Communist music venue, The Red and Black Café, in the early 1990s, a spin off to another talk program he produced with Sally Herrin, noted Lincoln author, and a number of others called " Zero Street " ( from the Allen Ginsberg poem " Wichita Vortex Sutra " in which AG called Lincoln's main drag, O Street, " Zero Street ").

Although their administrative offices are based in Des Plaines, Illinois, northwest of Chicago and near O ' Hare International Airport, the team plays its home games in neighboring Rosemont, Illinois at Allstate Arena ( formerly known as the Rosemont Horizon ), the same venue previously used by the Chicago Bruisers, one of the four original Arena Football League teams.

Thurso became a venue in the ASP World Qualifying Series of 2006 with the O ’ Neill Highland Open, a " 5 Star " event.

It was the venue of several of Shakespeare's plays, including Romeo and Juliet ( which gained " Curtain plaudits ") and Henry V. In this latter play the somewhat undistinguished Curtain gains immortal fame by being described by Shakespeare as " this wooden O.

The O < sub > 2 </ sub > Academy Birmingham is a music venue in Birmingham, England.

The former venue of the O < sub > 2 </ sub > Academy ( Carling Academy ) was known in the 1980s and 1990s as the Hummingbird and previously the site of the Rank Ballroom.

Like the fomer Academy venue, the new venue has a multi-room operation with the main room having a capacity of 3, 009 ( of which there is a dedicated 600 capacity seated area ) and two other rooms, the O < sub > 2 </ sub > Academy 2 with 600 and O < sub > 2 </ sub > Academy 3 with 250.

The band played their first gig at Leicester's O ' Jays venue.

Santa Pod is the venue in which the current world drag racing record, a time of 3. 58 seconds at 386. 26 mph ( 621. 61 km / h ) was set by Sammy Miller in his Vanishing Point rocket-propelled funny car in July 1984 ( a quicker 1 / 4 mile time of 3. 225 seconds was set by Kitty O ' Neil, but not on a drag racing surface ).

The venue is the home of the Canadian Opera Company ( COC ) and the National Ballet of Canada, replacing the Sony Centre for the Performing Arts ( earlier named the Hummingbird Centre and O ' Keefe Centre ) that had housed the COC for some 40 years.

The Subways appeared during the seventh episode of the third season of The O. C., " The Anger Management ", performing two songs at the music venue ' the Bait Shop ', " Rock & Roll Queen " and " Oh Yeah ".

Thereafter legendary promoter Gary Tovar and Goldenvoice Productions started booking shows at the venue, concerts by the likes of GBH, The Exploited, T. S. O. L., UK Subs, Circle Jerks, Angelic Upstarts, The Dickies, Wasted Youth, Dead Kennedys, The Vandals, D. O. A., Love Canal, Bad Religion, FEAR and M. I. A.

Their venue is the O. L.

The concert happened at New York City venue The Ritz, where S. O. D.

The O < sub > 2 </ sub > Shepherds Bush Empire ( the first word is sometimes spelled Shepherd's ) is a music venue in Shepherd's Bush, London, England, run by the Academy Music Group.

Under McNair, Theatre Calgary became an important venue for new Canadian drama, presenting premieres by John Murrell, W. O.

Generally, thanks to a suggestion by the BBC's Head of Outside Broadcasts, Martin J. O ' Connor, the primary purpose of the BBC OB unit was to broadcast a sporting event at that Swaporama venue later that day.

He began hosting shows at the International Comedy Cellar-a venue set up by Irish comics such as Ardal O ' Hanlon, Kevin Gildea and Barry Murphy.