part 2: circle all of the molecules. write the letter c on all of the molecules that can also be considered…

Explanation:

Step1: Recall definitions

A molecule is a group of two or more atoms held together by chemical bonds. A compound is a molecule that contains at least two different types of elements. An element is a substance made up of only one type of atom, and a di - atomic element is an element that exists as a molecule of two atoms of the same element.

Step2: Analyze first structure

The first structure has two different types of atoms, so it is a molecule and a compound. Circle it and label with 'C'.

Step3: Analyze second structure

The second structure has three different types of atoms, so it is a molecule and a compound. Circle it and label with 'C'.

Step4: Analyze third structure

The third structure has only one type of atom, so it is an element. Just circle it.

Step5: Analyze fourth structure

The fourth structure has two different types of atoms, so it is a molecule and a compound. Circle it and label with 'C'.

Step6: Analyze fifth structure

The fifth structure has two atoms of the same type, so it is a di - atomic element. Just circle it.

Step7: Analyze sixth structure

The sixth structure has two different types of atoms, so it is a molecule and a compound. Circle it and label with 'C'.

Answer:

Circle all the structures. Label with 'C' the first, second, fourth and sixth structures. Label the third structure as an element and the fifth structure as a di - atomic element.