The answer is (3)amine. The aldehyde structure is -CHO. The alcohol structure is -OH. The amine structure is -NH2. And the ether structure is R-O-R'. The "R" means other function groups.
This is covalent network type of solid.
For example, silicon dioxide (SiO₂) is covalent network solid with covalent bonding.
Covalent network solid is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material.
Silicon(IV) oxide has continuous three-dimensional network of SiO₂ units and diamond has sp3 hybridization.
This solids do not have free electrons so they are good insulators.
They have strong covalent bonds, so they melt at extremely high temperature.
Other examples are quartz, diamond, and silicon carbide.
More about network solid: brainly.com/question/15548648
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False , I hope this helps
a. 1.05 x 10⁻³ mol
b. 0.155% w/v
<h3>Further explanation</h3>
Given
50 ml Ca(OH)₂
19.5 ml of 0.1059 N HCl
Required
Amount of Ca(OH)₂
The Ca(OH)₂ concentration in % w/v.
Solution
Titration formula :
M₁V₁n₁=M₂V₂n₂
or
N₁V₁=N₂V₂
n = acid base valence=amount of H⁺/OH⁻(Ca(OH)₂=2, HCl=1)
a.
Input the value(1=Ca(OH)₂, 2= HCl) :
M₂=N₂=0.1059 M
M₁. 50 ml . 2 = 0.1059 . 19.5 . 1
M₁ = 0.021
Amount of Ca(OH)₂ :
mol Ca(OH)₂ = 0.021 x 50 ml = 1.05 mlmol = 1.05 x 10⁻³ mol
b. mass of Ca(OH)₂
= mol x MW
= 1.05 x 10⁻³ mol x 74 g/mol
= 0.0777 g
%w/v = (g solute / volume of solution) x 100
%w/v =( 0.0777 g/ 50 ml) x 100 =0.155% w/v
The cloud with those characteristics is #1