Answer:
Perform pilot runnings in order to try out its performance in airplanes.
Explanation:
Hello,
Engineering provides powerful tools to implement new materials in several applications, nonetheless, before the application stages, a set of pilot runnings must be performed in order to test the efficiency, reliability and assurance of the aimed material. Tests such as hardness, mechanical and chemical resistance and others are used to establish the viability of the new material, in this case, the aforesaid new metal.
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balance the chemical reaction by the oxidation reduction method Phosphorus + Sodium Hydroxide + water
Answer:
Option (2)
Explanation:
Cohesion is usually defined as the contrasting property by which the water molecules are attached to one another, and adhesion is the property by which the molecular substances are linked to the molecules of other substances.
Since, the water molecules are able to form inter-molecular hydrogen bonding, so they are comprised of strong cohesive force.
And, as the water molecules are able to stick to the walls of the container, so they tend to show more of the properties for adhesion.
Thus, according to the given condition, water molecules are sticking to other substances and this is the property of adhesion.
Hence, the correct answer is option (2).
Answer: The SI unit of force is the newton, symbol N.
Explanation:
Answer: The freezing-point depression constant (Kf) of nitrobenzene is ![5.7^0C/m](https://tex.z-dn.net/?f=5.7%5E0C%2Fm)
Explanation:
Depression in freezing point is given by:
![\Delta T_f=i\times K_f\times m](https://tex.z-dn.net/?f=%5CDelta%20T_f%3Di%5Ctimes%20K_f%5Ctimes%20m)
= Depression in freezing point
i= vant hoff factor = 1 (for non electrolyte nitrobenzene)
= freezing point constant = ?
m= molality
![\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}](https://tex.z-dn.net/?f=%5CDelta%20T_f%3Di%5Ctimes%20K_f%5Ctimes%20%5Cfrac%7B%5Ctext%7Bmass%20of%20solute%7D%7D%7B%5Ctext%7Bmolar%20mass%20of%20solute%7D%5Ctimes%20%5Ctext%7Bweight%20of%20solvent%20in%20kg%7D%7D)
Weight of solvent = 20 g = 0.02 kg
mass of solute (ethanol) = 1.0 g
Molar mass of ethanol = 46 g/mol
![6.2=1\times K_f\times \frac{1.0g}{46g/mol\times 0.02kg}](https://tex.z-dn.net/?f=6.2%3D1%5Ctimes%20K_f%5Ctimes%20%5Cfrac%7B1.0g%7D%7B46g%2Fmol%5Ctimes%200.02kg%7D)
![K_f=5.7^0C/m](https://tex.z-dn.net/?f=K_f%3D5.7%5E0C%2Fm)
Thus freezing-point depression constant (Kf) of nitrobenzene is ![5.7^0C/m](https://tex.z-dn.net/?f=5.7%5E0C%2Fm)