Search for Life Unit Test

Front

What is the Lewis dot structure for water (H₂O)?

Back

The Lewis dot structure for water shows the oxygen atom in the center with two hydrogen atoms bonded to it, and two lone pairs of electrons on the oxygen.

Front

How many lone pairs surround the oxygen atom in water (H₂O)?

Back

2

Front

What type of bond is formed when metals bond with non-metals?

Back

Ionic bond.

Front

What is the name of BCl₃?

Back

Boron trichloride.

Front

How are electrons shared in a polar covalent molecule?

Back

Unevenly.

Front

What is a polar covalent bond?

Back

A type of bond where electrons are shared unequally between two atoms, resulting in partial positive and negative charges.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons.

Front

What happens to NaCl when it is added to water?

Back

The Na+ and Cl- ions dissociate and are surrounded by water molecules, which orient themselves based on the charge of the ions.

Front

What is the significance of lone pairs in molecular geometry?

Back

Lone pairs can affect the shape of a molecule by repelling bonding pairs of electrons, leading to different molecular geometries.

Front

What is the octet rule?

Back

Atoms tend to bond in such a way that they have eight electrons in their valence shell, achieving a stable electron configuration.