Unit 11 Review: Changes in Matter

How are covalent bonds formed?

• Sharing of electrons
• Transfer of electrons

How are ionic bonds formed?

• Transfer of electrons
• Sharing of electrons

The chemical properties of a substance come from how it forms chemical __________ with other substances.

• bonds

• equations

• valence electrons

When atoms ________ they form chemical bonds.

• combine

• duplicate

• replicate

Chemical bonds ______ energy when they form.

• absorb

• reflect

• release

Chemically bonded atoms have lower energy than free (unbonded) atoms.

• True

• False

An ion is an atom or molecule that has a charge.

• True

• False

During a ____ change, a substance changes its form but remains the same substance.

• chemical

• physical

During a ____ change, one or more substances are turned into a different substance that has different properties.

• chemical

• physical

A chemical ____ is a system of chemical changes that involves the breaking and reforming of chemical bonds.

• equation

• reaction

• product