Final answer:
Hydrogen and oxygen molecules in the air have certain physical and chemical properties. They are colorless, odorless, and lighter than air. They can combine to form water through a highly reactive combustion reaction.
Step-by-step explanation:
Hydrogen and oxygen are two gases that can be found in the air and can combine to form molecules of water, H2O. Let's start with the physical properties of these molecules. Hydrogen and oxygen gases are both colorless and odorless. They are lighter than air and are therefore present in the atmosphere.
Now, let's discuss the chemical properties of these molecules. Hydrogen and oxygen molecules are highly reactive. They can undergo a chemical reaction known as combustion, where they combine to form water vapor. This reaction releases a significant amount of energy in the form of heat and light.
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