Which of the following statements is NOT true? -In terms of size of the electron

Question

Which of the following statements is NOT true?

-In terms of size of the electron domain, a triple bond is larger than a lone pair of electrons.

-The bond angle adjacent to a double bond is larger than the bond angle opposite the double bond.

-A single bond, a double bond, a triple bond and a lone pair of electrons all count as a single electron domain.

-The number of electron domains sets the number of hybrid orbitals needed for bonding and lone electron pairs.

Which of the following statements about enthalpies of reactions is NOT correct?

-Enthalpy changes are sensitive to the physical states (solid, liquid, or gas) of the reactants and the products.

-The enthalpy change for the forward reaction is the same as the backward reaction except the sign is the opposite.

-Enthalpy change is a not a state function where “q” is a state function.

-Enthalpy is an extrinsic property of a compound.

The value for H° for the reaction below is -72 kJ. How many kJ of heat are released when 1.0 mol of HBr is formed in this reaction? -72kJ, 36kJ, 144kJ, 72kJ, 0.44kJ

          H2(g) + Br2(l) = 2HBr(g)

Thank you

Explanation / Answer

NOT true

1. The bond angle adjacent to a double bond is larger than the bond angle opposite the double bond.

NOT true

2. -Enthalpy change is a not a state function where “q” is a state function.

3. H2(g) + Br2(l) = 2HBr(g) H° = -72 kj

from the equation

2 mole HBr = -72 kj

1 mole HBr = -72/2 = -36 kj

answer : 36 kj heat released.

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