Answer:
a) Molecular crystal
b) Molecular crystal
c) Molecular crystal
d) Ionic crystal
e) Metallic crystal
f) Covalent crystal
g) Ionic crystal
h) Metallic crystal
Explanation:
The bonds between the elements can be classified as ionic, covalent or metallic. The ionic bonds happen between a metal and a nonmetal, where the metal donates electrons and the nonmetal gain the electrons, forming ions. When this occurs, the solid formed is called ionic crystals, such as KBr and LiCl.
When the bond is between nonmetals, its called a covalent bond, and the nonmetals share pair of electrons. When a solid is formed, it can be called as covalent crystals or molecular crystals. The molecular crystals are formed by a determined number of electrons such as CO₂, Br₂ and S₈. On the other hand, the covalent crystals are polymolecular, such as the silica, SiO₂.
When metals do bonds between them, the bond is called a metallic bond, which can happen between atoms of the same element or different elements. The solid formed is called metallic crystal, such as Mg, and Cr.
Answer:
layers of rock get folded
here we have to choose the limiting reactant in the given unbalanced reaction.
The 5.6 moles of aluminum will be the limiting reactant in this reaction.
The reagent or reactant which is totally consume in a reaction is called the limiting reagent or reactant.
The unbalanced reaction is Al + H₂O → Al₂O₃ + H₂
On balancing 2Al + 3H₂O = Al₂O₃ + 3H₂
As we can see that 2 moles of aluminium (Al) reacts with 3 moles of water (H₂O). Thus 5.6 moles of Al reacts with
×5.6 = 3.733 moles of water.
Henceforth the 5.6 moles aluminum will be the limiting reactant as it is totally consume, but only 3.733 moles of water is reacting and the rest 6.2 - 3.733 = 2.467 moles of water will remain excess in this reaction.
Thus the aluminum will be the limiting reactant.
