Chapter 2

An ________________ is the smallest basic unit of matter

• ion

• compound

• molecule

• atom

An _________ is one particular type of atom, and it cannot be broken down into a simpler substance by ordinary chemical means.

• element

• compound

• molecule

• chemical bond

A ___________ is a substance made of atoms of different elements bonded together in a certain ratio.

• element

• ion

• compound

• atom

A(n) ____________________ bond forms through the electrical force between oppositely charged ions; this forms when one atom loses or gains electron to another.

• chemical

• covalent

• hydrogen

• ionic

An ____________ is an atom that has gained or lost one or more electrons

• molecule

• atom

• ion

• element

A(n) _______________ bond forms when atoms share a pair of electrons.

• covalent

• chemical

• hydrogen

• ionic

A ________ is formed by a covalent bond.

• compound

• ion

• molecule

• atom

Water is a _____________ molecule, which means it has a region with a slight positive charge and a region with a slight negative charge.

• ionic

• elemental

• polar

• catty-wompus

Opposite charges of these molecules can interact to form _______ bonds, which are an attraction between a slightly positive hydrogen atom and a slightly negative oxygen atom. They hold multiple water molecules together and often depicted with a dotted line.

• hydrogen bond

• covalent bond

• ionic bond

• chemical bond

The attraction among molecules of the same substance is _______________.

• covalent bond

• ionic bond

• adhesion

• cohesion