Final answer:
The given statements describe a combination of physical and chemical properties of hydrogen.
Step-by-step explanation:
In the given statements, the type of property being described can be determined as follows:
- Hydrogen is a colorless, tasteless, and odorless gas. Physical property. This is because the statement describes observable characteristics of hydrogen without changing its identity.
- Hydrogen is very combustible in the presence of oxygen. Chemical property. This is because the ability of hydrogen to undergo combustion is a characteristic that describes how it changes form in the presence of oxygen.
- Hydrogen is very reactive with most elements. Chemical property. Reactivity is a characteristic that describes how hydrogen changes form when it interacts with other elements.
- Hydrogen is the least dense of all elements. Physical property. This statement describes a measurable characteristic of hydrogen without changing its identity.