Answer:
a standard case of pneumonia.
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Answer:
73140 kJ.
Explanation:
Equation of the hydrogenation reaction:
C2H4 + H2 --> C2H6
Molar mass = (2*12) + (6*1)
= 30 g/mol
Mass of C2H4 = 15.9 kg
= 15900 g
Number of moles = mass/molar mass
= 15900/30
= 530 mol of C2H6
By stoichiometry, 1 mole of C2H4 is hydrogenated to give 1 mole of C2H6
Number of moles of C2H4 = 530 mole
Q = n * q
= 530 * 138 kJ
= 73140 kJ.
Answer: The net ionic equation for the cobalt-silver voltaic cell is 
Explanation: In cobalt-silver voltaic cell, one half of the cell consists of cobalt electrode immersed in 
solution ( which means that 
are present in the solution) and other half of the cell consists of the Ag electrode immersed in 
solution ( which means that 
is present in the solution)
The two electrodes are joined by the copper wire. The cobalt electrode acts as an anode and the silver electrode acts a cathode.
At anode, oxidation reaction takes place and at cathode, reduction reaction takes place.
At Anode : 
At Cathode: ![[Ag^+(aq.)+e^-\rightarrow Ag(s)]\times 3](https://tex.z-dn.net/?f=%5BAg%5E%2B%28aq.%29%2Be%5E-%5Crightarrow%20Ag%28s%29%5D%5Ctimes%203)
Net ionic equation:
Answer: B. The molecules move faster and become less dense
Explanation:
Liquid is the state of matter in which particles are less tightly bound as compared to solids as they have weak inter molecular forces as compared to solids.
Thus when a solid is heated, the molecules start moving in random motion due to an increase in the kinetic energy. The molecules move apart as the forces will be weak and thus less molecules will be present per unit volume. Thus it will become less dense.
