The covalent model

What is the correct electron domain geometry and molecular geometry of $\ce{SF4}$? A. Trigonal bipyramidal electron domain geometry, trigonal bipyramidal molecular geometry B. Trigonal bipyramidal electron domain geometry, seesaw molecular geometry C.…

Which species contains a coordination bond? A. $\ce{AlCl3}$ B. $\ce{PH3}$ C. $\ce{[NH4]+}$ D. $\ce{HCOO-}$

Which molecules are polar? I. $\ce{CHCl3}$ II. $\ce{CH2F2}$ III. $\ce{CF4}$ A. I and II only B. I and III only C. II and III only D. I, II and III

How many sigma and pi bonds are present in pent-1-yne, $\ce{C5H8}$? A. 12 sigma bonds and 2 pi bonds B. 8 sigma bonds and 3 pi bonds C. 13 sigma bonds and 1 pi bond D. 9 sigma bonds and 4 pi bonds

Outline why solid tin(IV) iodide is classified as a polar covalent compound. Use sections 9 and 17 of the data booklet.

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…

Which row shows the gas and the conditions under which its behaviour is closest to that of an ideal gas? A. Hydrogen fluoride, $\ce{HF}$, at high pressure and low temperature B. Methane, $\ce{CH4}$, at high pressure and low temperature C. Hydrogen fluoride,…

(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, $\ce{C2O4^2-}$.…

Which molecule is polar? A. $\ce{BF3}$ B. $\ce{NF3}$ C. $\ce{CCl4}$ D. $\ce{C2H4}$