Bonds formed between atoms can be classified as ionic and covalent
Ionic bonds are formed between atoms that have a high difference in the electronegativity values.
In contrast, bonds formed between atoms that have a difference in electronegativity lower than the ionic counterparts are polar covalent bonds. If the atoms have very similar electronegativities, they form non-polar covalent bonds.
In H2S, the S atom is bonded to 2 H atoms. The electronegativity of H = 2.2 and S= 2.56. Since the difference is not high the bond formed will be covalent (polar covalent).
Physicalchange. Lighting a match and letting is burn is an example of a chemical change. Chemical reactions cause chemicalchanges. In a chemical reactiontwo or more substances, called the reactants, form different substances called products.
Explanation:
Pumice is an extrusive igneous rock that is produced through volcanic activities.
A rock like pumice will pass through the rock cycle and be transformed to other rock types with time.
Pumice contains rich mafic minerals giving it that black appearance.
The consequences of this is that when the rock is acted upon by weathering elements, it is weathered to clay. A fine grained sediment. It will eventually be transformed to shale or claystone sedimentary rocks.
If is goes through the metamorphic path, a schist will form under conditions of high pressure and temperature. New minerals will grow and metamorphic transformation would be vivid.
Eventually, both sedimentary and metamorphic rocks can be subducted and will form the original melt again.
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