Chemistry Review Semester 1

Front

Which element has 2 valence electrons?

Back

Calcium (Ca) has 2 valence electrons.

Front

What is the Lewis dot structure for a neutral atom of oxygen (O)?

Back

The Lewis dot structure for oxygen has 6 dots around the symbol O.

Front

Convert 8 km to meters.

Back

8 km is equal to 8,000 meters.

Front

What are properties that depend on the identity of a substance?

Back

Intensive properties depend on the identity of a substance.

Front

What is the correct formula for ammonia?

Back

The correct formula for ammonia is NH₃.

Front

What is the atomic number of oxygen?

Back

The atomic number of oxygen is 8.

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 difference between extensive and intensive properties?

Back

Extensive properties depend on the amount of substance (e.g., mass), while intensive properties do not (e.g., density).

Front

What is the formula for calculating density?

Back

Density = Mass/Volume.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number and properties, helping predict chemical behavior.