Question

1.. When a hydrogen (H) atom collides with a chlorine (Cl₂) molecule, the following reaction occurs with release of energy:

H (g) + Cl₂ (g) --> HCl (g) + Cl (g)

Which ONE of the following statements is true?

Group of answer choices

a. The relative bond strengths cannot be determined from the information provided.

b. The H – Cl bond is stronger than the Cl – Cl bond.

c. The H – Cl bond is weaker than the Cl – Cl bond.

2... Compare two cups of water of the same mass one at 25ºC and the other at 85ºC. When each is contacted to a large object of temperature T, which statement is correct?

  

a. The heat transfer depends on the temperature of the large object.

b. The 25°C cup of water transfers more heat.

c. They transfer the same total amount of heat.

3.. Octane, C₈H₁₈, has a higher molar heat capacity than ethanol, C₂H₆O. Which statement provides an explanation for this observation? Select all that apply.

bp (ethanol) = 78.37°C bp (octane) = 125.6°C

      C_p (ethanol) = 112 J/gmol-°C       c_p (octane) = 228 J/mol-°C

  

a. The IMFs between octane molecules are greater.

   

b. More energy is transferred to vibrational movements in octane because it has more covalent bonds than ethanol

   

c. There are more hydrogen bonds between octane molecules.

   

d. The covalent bonds in octane are stronger than in ethanol.

4.. Why do you feel cold when water evaporates from your body after you leave a swimming pool? Assume that the system is the water and your body is part of the surroundings.

  

a. The potential energy becomes more negative and heat is transferred from your body to the water.

   

b. The potential energy becomes more negative and heat is transferred from the water to your body.

   

c. The potential energy becomes more positive and heat is transferred from the water to your body.

   

d. The potential energy becomes more positive and heat is transferred from your body to the water.

5..The decrease in potential energy for the interaction between two species is most negative for:

  

a. Two methane molecules

      

b. Two nitrogen atoms

   

c. Two bromine atoms

Answer 1

(m)] Given Reaction - Hig) + Cl₂1g) HIILGI + clig) [option (C) is Cosmect] - H-al bond is weaker than c-cl bond. This is because all lectronegative element and it will pull electrons towards it. This will cause charge separation. Hence, H-al will be weaker because of greater polarity. In case of chigl. The electronegativity of both atoms are same Hence, there is no polarity. St Hcl (a) option (al is incomect be determined from given (bl option (b) is incorrect I-a bond. Relative weaker Bond as relative bond strength cannot information. - as H-abond strength is weaker than