How do erratics form?

Glacial erratics aren't exactly formed. They were deposited by glaciers that were moving in that area at one time.

stars

Then there's nothing there.

These are contact arrangements that can be found on switches and relays. The form designation is fairly old and rarely used now. Form A: a single, normally open contact that closes upon...

This will only occur if the alpha carbon to the carbonyl group can be protonated. The keto form of acetone (for example), would be a -CH2COCH3. The alpha carbon has lost a hydrogen and is negatively...