Explanation:
The history of contact process was used until a need for concentrated acid arose, particularly for the manufacture of synthetic organic dyes.
B. The element nitrogen is made up only of nitrogen atoms.
Explanation:
Dalton stipulated , in his theory, that all the atoms of pure elements were identical. However different elements had different kinds of atoms that differ in their size and mass. The other stipulations of Dalton's theory were that atoms are the smallest unit of mass and were indivisible – this was later rebutted by advanced atomic theories .
Another major contribution by Dalton's theory is that chemical reactions involved the rearrangement of atoms observing the law of conservation of mass,
Answer:
A. Polar regions receive less solar energy and heat per unit area than tropical regions.
Explanation:
The sun is lower in the sky the farther away from the equator you go (at higher latitudes), so the solar energy is less direct. Climate in areas with less direct solar input tends to be generally cooler.
Answer:
The Content in the tubes is:
tube 1:<em> Fat</em>
<em>tube 2: Lactose</em>
tube 3: Insulin
tube 4: RNA
tube 5: Lysine
Explanation:
tube 1: Fat is always not compatible with water it means hydrophobic
tube 2: For rejection of the other tubes the last molecule to assigned a tube is lactose due to we do not have a specific test information for tube 2
tube 3: The insulin has a two disulfide bonds and is the only molecule with sulphur atoms.
tube 4: The nitrogen based compounds that belongs to the RNA are binded with phosphate groups all around its chain, so the presence of phosphate indicates that is RNA.
tube 5: Because was the only one who does not hydrolyse it is an aminoacid.
finally it says that in the tubes 3, 4 and 5 has nitrogen, the only 3 compound with nitrogen are Lysine, insulin and RNA.