An Aldotetrose is a tetrose sugar (4 Carbons) with an aldehyde functional group on the first atom.
The D- compound contains the last bottom asymmetric -OH group at the right side of the Fischer's projection. The L-compound contains the last bottom asymmetric -OH at the left side of the Fischer projection.
So the Fischer's projection of the four aldotetroses is as follow:
NaOH, is not an element, but a compund. Meaning it's chemically bonded. Na is sodium, O is oxygen and H is hydrogen.
Sodium is a metal, Oxygen is a non-metal and hydrogen is also not a metal.
Meaning that this is an Ionic compound. Hope this helps.
Multiply first and then divide
Mineral water is a type of mixture called a homogeneous solution. This is because there are very small amounts of dissolved minerals in mineral water, such as zinc, iron, copper, magnesium and many others. However, to the eye, mineral water just looks like distilled water.