chemguide's definitions

theophylline

A dimethyl derivative of xanthine, structurally similar to theobromine.

Theophylline is used in therapy for respiratory diseases.

by chemguide August 11, 2019

Tetrahydrofuran

Tetrahydrofuran (THF) is a cyclic ether (heterocyclic compound) with a 5-member ring and an oxygen atom inside. Its formula is C4H8O

We need ionic compounds for this reaction! Use tetrahydrofuran or it won't dissolve!

by chemguide August 10, 2019

imide

Amide but with one more carbonyl group. It is not basic and if the nitrogen is bonded to H, even sodium hydroxide can deprotonate it.

Imides have very low pKa values, and is not basic at all.

by chemguide August 10, 2019

cyclohexane

The most stable cycloalkane. It has a 6-membered carbon ring with all hydrogen atoms surronding it

Cyclohexane also has 2 conformers: chair and boat. The chair conformer is more stable because of its reduced strain.

by chemguide August 12, 2019

Cathode

The positive electrode where electrons are moved to.

In a battery, the metal ions in cathode gains electrons while the anode loses.

by chemguide August 5, 2019

Anode

The negative electrode of a battery where things loses electrons.

In the electrolysis of water, the anode produces oxygen.

by chemguide August 5, 2019

methyl orange

A pH indicator (most commonly) used in acidic conditions.

In acidic conditions methyl orange is red but in neutral / basic conditions it is yellow.

by chemguide August 11, 2019