The postulates of Dalton's theory were:
1) Elements are made of extremely small particles called atoms
2) <span>Atoms of a given element are identical in size, mass, and other properties
</span>3) <span>Atoms cannot be subdivided, created, or destroyed</span>
4) Atoms combine in whole number ratio to form compounds
5) Chemical reactions are the rearrangement of atoms
The third postulate has been disproved by modern science, in which the atom has been split and been subdivided into smaller parts such as the neutron, proton and electron, which are further subdivided into quarks, gluons, and kaons.
The second postulate was also disproved upon the discovery of isotopes.
Answer:
Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. The motivating force for seafloor spreading ridges is tectonic plate slab pull at subduction zones, rather than magma pressure
Explanation:
Answer:
1. S+ O2-->So2..... synthesis reaction or direct combination.
2.. precipitation reaction
3. Displacement reaction
4. Decomposition reaction
Answer:
See explanation
Explanation:
Since the -CH3CN and the -F are in 1,4 position, then the synthesis started with flourobenzene. This has to be because -F is ortho-para directing in nucleophilic substitution.
The next step is the Friedel craft alkylation of the substrate. The alkyl group is directed to the para position by the -F.
Bromination using NBS yields an alkyl bromide that undergoes SN2 substitution to yield the target compound.