7th Grade Chemistry Review

Front

What period is Sodium (Na) found in?

Back

Sodium (Na) is found in period 3.

Front

What type of change occurs when paper burns?

Back

Burning paper is a chemical change.

Front

How many electrons can fit on the 1st energy level (orbital) in a Bohr Model?

Back

The 1st energy level can hold 2 electrons.

Front

How many neutrons are in potassium?

Back

Potassium has 20 neutrons.

Front

What is the chemical symbol for gold?

Back

The chemical symbol for gold is Au.

Front

What is the atomic number of Sodium (Na)?

Back

The atomic number of Sodium (Na) is 11.

Front

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

Back

A chemical change results in the formation of new substances, while a physical change does not.

Front

What is the maximum number of electrons in the 2nd energy level?

Back

The 2nd energy level can hold a maximum of 8 electrons.

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the significance of the atomic mass of an element?

Back

The atomic mass indicates the average mass of an atom of an element, accounting for isotopes.