Unit 4 Practice Test ALL

Front

What is the correct formula for lithium oxide?

Back

Li₂O

Front

What happens to an atom when it gains electrons?

Back

It becomes negative because it has added electrons.

Front

What must the last part of a compound's name be when naming it?

Back

The element with 'ide' at the end, unless it's a polyatomic ion.

Front

How many molecules are in a mole of methane (CH₄)?

Back

6.022 x 10²³

Front

When naming ionic compounds with transition metals, what must be included?

Back

Roman numerals to show the charge of the metal.

Front

What is the definition of a mole in chemistry?

Back

A mole is a quantity that contains 6.022 x 10²³ entities (atoms, molecules, etc.).

Front

What is the significance of the 'ide' suffix in compound naming?

Back

It indicates that the compound is formed from two elements, typically a metal and a non-metal.

Front

What is the charge of a lithium ion (Li)?

Back

Li has a charge of +1 when it loses one electron.

Front

What is a polyatomic ion?

Back

A charged ion composed of two or more atoms bonded together.

Front

What is the formula for calculating the molar mass of a compound?

Back

Add the atomic masses of all atoms in the compound's formula.