Chem A Unit 3 Test Review- Cross 2024

Front

What are valence electrons?

Back

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

Front

Which element has the least number of valence electrons: Rb, Mg, Ar, or Ga?

Back

Rb (Rubidium) has 1 valence electron.

Front

How many electrons can each orbital hold?

Back

Each orbital can hold a maximum of 2 electrons.

Front

What is the sublevel that comes after 4s?

Back

The sublevel that comes after 4s is 3d.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, such as reacting hydrogen and oxygen to make water.

Front

Give an example of a physical change.

Back

Grinding pepper is an example of a physical change.

Front

What is the definition of volume?

Back

Volume is the amount of space that a substance or object occupies.

Front

What is the volume of a liquid measured in milliliters (mL)?

Back

Volume can be measured in milliliters, such as 15.5 mL.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the electron configuration for an atom with 12 electrons?

Back

The electron configuration for an atom with 12 electrons (Magnesium) is 1s² 2s² 2p⁶ 3s².