Question

activity a: build a glucose molecule
get the gizmo ready: be sure the create glucose tab is still selected.
introduction: each element tends to form a certain number of chemical bonds. this value is the valence of the element. for example, a carbon atom has a valence of four.
goal: construct a molecule of glucose.

1. identify: the structure of a water molecule (h₂o) can be written as h - o - h, with each dash representing a chemical bond. count the number of bonds the oxygen and hydrogen atoms form in a water molecule.

a. what is the valence of oxygen?
b. what is the valence of hydrogen?

Explanation:

Step1: Analyze water - molecule structure

The structure of water is H - O - H. Oxygen is in the middle and forms 2 bonds with hydrogen atoms.

Step2: Determine oxygen valence

Since oxygen forms 2 bonds in H₂O, the valence of oxygen is 2.

Step3: Determine hydrogen valence

Each hydrogen atom forms 1 bond in H₂O, so the valence of hydrogen is 1.

Answer:

A. 2
B. 1