Unit 14 Practice Test*

Front

What is the formula for calculating percent by mass?

Back

Percent by mass = (mass of solute / mass of solution) x 100%

Front

What is 11.20% expressed as a decimal?

Back

0.1120

Front

What is the charge on a zinc ion?

Back

2+

Front

If an atom has 1 valence electron, what charge will it have when it becomes an ion?

Back

+1

Front

How many molecules are in 2.5 mol of NaCl?

Back

1.51 x 10^24

Front

Define valence electrons.

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the significance of the charge of an ion?

Back

The charge of an ion determines how it interacts with other ions and molecules, influencing chemical reactions.

Front

How do you convert moles to molecules?

Back

Use Avogadro's number: 1 mole = 6.022 x 10^23 molecules.

Front

What is the difference between cations and anions?

Back

Cations are positively charged ions, while anions are negatively charged ions.

Front

What is the role of a solute in a solution?

Back

A solute is the substance that is dissolved in a solvent to form a solution.