quiz chemistry

Which of these elements does not exist as a diatomic molecule?

• I

• HE

• F

• H

Which one of the following compounds is not covalent

• SCl2

• HCl

• S2Cl2

• KCl

How many valence electrons does an atom of any halogen have?

• 1

• 7

• 4

• 2

A diatomic molecule with a triple covalent bond is

• N2

• Br2

• H2

• . O2.

..

A molecule of nitrous oxide, N2O, :N=N=O contains all of the following except

..

• a coordinate covalent bond.

• a double bond.

• a triple bond.

• nonbonding pairs of electrons

If a bonding pair of electrons is unequally shared between two atoms, the bond is

• ionic.

• nonpolar covalent.

• coordinate covalent

• polar covalent

Which of the following compounds is not ionic?

• NaI

• CO2

• CaCl2

• Na2O

A covalent bond forms

• when atoms share electrons.

• when an element becomes a noble gas.

• between metals and nonmetals.

• when electrons are transferred from one atom to another

Which of these compounds would not have covalent bonds?

• NO2

• . N2O4

• K2O

• H2O

A molecule with a single covalent bond is

• CO2.

• F2.

• NO.

• N2.