Which of the following diatomic molecules has the highest boiling point? H_2 N_2

Question

Which of the following diatomic molecules has the highest boiling point? H_2 N_2 O_2 Br_2 Which of the following is true for the reaction of sodium metal and chlorine gas? electrons are shared between Na and Cl atoms electrons are transferred from Na to Cl atom electrons are transferred from Cl to Na atom nothing happens between Na and Cl atoms In which of the following substances would you expect to find ionic bonding? CH_3Cl SO_2 HCI KCL Which of the following correctly describes a sigma bond? a bond formed when two orbitals overlap head-on a bond formed when two orbitals overlap side-by-side a triple bond a double bond Which of the following most correctly describes a pi bond? bond formed when two orbitals overlap head-on bond formed when two orbitals overlap side-by-side a single bond an ionic bond In which of the following substances would you be most likely to see pi bonding CCl_4 HCL NaBr CO_2 Which of the following hydrocarbons has the lowest boiling point? propane. C_3H ethane., C_2H_6 methane, CH_4 butane, C_4H_10 Which shape and H-O-Hi bond angle are predicted by VSEPR theory for H_2O? linear. 180 degree bent. 120 degree linear. 90 degree bend,

Explanation / Answer

1 - (d)

Br2 is a liquid, others are gases. Other reason is that it has highest molar mass.

2 - (b)

Sodium atom transfers an electron to chlorine atom.

3 - (d)

KCl - strong ionic bonding because of the difference in the electronegativity of these elements.

4 - (a)

Head-on overlapping

5 - (b)

side-by-side

6 - (a)

7 - (c)

All are members of homologous series. CH4 is at the lowest point in this series.

8 - (d)

bent and angle is 104 deg.

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