Answer:
Explanation:
From the combustion of carbon, the reactions occurring in limited oxygen conditions are:
If it occurs in excess, then any leftover CO changes to CO2. i.e.
---- (1)
----- (2)
From (1), the enthalpy change is:
From (2), the enthalpy change is:
Subtracting (2) from (1), we get:
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The enthalpy change ΔH of the reaction = -110.5 kJ/mol
This is a true statement because the author can then be further looked into and researched
Water acts as an acid (donates H+) when it reacts with a stronger base, say sodium hydroxide. Water acts as a base (accepts H+) when it reacts with a stronger acid, say hydrochloric acid. If the medium is water, water, having a pH of 7, is considered neutral.
Answer: Option (3) is the correct answer.
Explanation:
Molecular substances are the substances which have two or more different atoms attached together.
Molecular substances have weak intermolecular forces of attraction thus, they have low melting and boiling point.
They have poor electrical conductivity as the bond formation in molecular compounds is covalent. Therefore, they also have poor heat conductivity.
Hence, out of the given options low melting point is the characteristic property of molecular substances.