Unit 4 Practice Test ALL

Front

What is an ion?

Back

An ion is a charged particle that has either lost or gained one or more electrons, resulting in a positive (cation) or negative (anion) charge.

Front

How many atoms are in 1 mole of any substance?

Back

1 mole of any substance contains 6.02 x 10^23 atoms.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23 particles/mol, which is the number of atoms, molecules, or formula units in one mole of a substance.

Front

What is the relationship between moles and particles?

Back

The relationship is defined by Avogadro's number: 1 mole = 6.02 x 10^23 particles.

Front

How do you calculate the number of atoms in a given number of moles?

Back

Multiply the number of moles by Avogadro's number (6.02 x 10^23).

Front

What is the formula to convert grams to moles?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of zinc (Zn)?

Back

The molar mass of zinc is approximately 65.38 g/mol.

Front

If you have 0.50 moles of zinc, how many grams do you have?

Back

0.50 moles of zinc = 0.50 x 65.38 g/mol = 32.69 grams.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of atoms bonded together.