Zadania z chemii IB HL

At room temperature hydrogen cyanide is a liquid that evaporates readily, whereas ethyne, $\ce{C2H2}$, which has almost the same molar mass, is a gas that boils at −84 °C. (i) Draw the Lewis formula of the hydrogen cyanide molecule, showing all valence…

(i) Draw the Lewis formula of buta-1,3-diene. (ii) State the hybridization of the carbon atoms in buta-1,3-diene.

Both ionic and covalent bonding are present in sodium ethanedioate, $\ce{Na2C2O4}$. (i) Describe both types of chemical bonding present in this compound. Ionic bonding: Covalent bonding: (ii) Deduce a Lewis formula of the ethanedioate ion, $\ce{C2O4^2-}$.…

For which of these molecules is the octet rule satisfied by every atom? I. $\ce{SiCl4}$ II. $\ce{NCl3}$ III. $\ce{BCl3}$ A. I and II only B. I and III only C. II and III only D. I, II and III

(i) State the electron configuration of a nitrogen atom. (ii) Draw the Lewis formula of ammonia. (iii) Deduce the electron domain geometry and the molecular geometry of the ammonia molecule. (iv) Explain why the ammonia molecule is polar.

Which row lists these molecules in order of increasing bond angle? A. $\ce{NF3}$, $\ce{SiH4}$, $\ce{HCHO}$, $\ce{C2H2}$ B. $\ce{SiH4}$, $\ce{NF3}$, $\ce{HCHO}$, $\ce{C2H2}$ C. $\ce{NF3}$, $\ce{HCHO}$, $\ce{SiH4}$, $\ce{C2H2}$ D. $\ce{C2H2}$, $\ce{HCHO}$,…

Sulfur forms a dichloride, $\ce{SCl2}$, and a hexafluoride, $\ce{SF6}$. (i) Deduce the Lewis formula of $\ce{SCl2}$. (ii) Deduce the molecular geometry of $\ce{SCl2}$ and of $\ce{SF6}$. (iii) Suggest a value for the bond angle in $\ce{SCl2}$.

Which row correctly gives the electron domain geometry and the molecular geometry of sulfur dichloride, $\ce{SCl2}$? A. Trigonal planar electron domain geometry; bent molecular geometry B. Linear electron domain geometry; linear molecular geometry C.…

What are the electron domain geometry and the molecular geometry of the $\ce{BrF4-}$ ion? A. Electron domain geometry: tetrahedral; molecular geometry: tetrahedral B. Electron domain geometry: trigonal bipyramidal; molecular geometry: seesaw C. Electron domain…