Determine which type of property each statement describes by typing “physical” or “chemical” in the blank
hydrogen is a colorless, tasteless, and odorless gas
hydrogen is very combustible in the presence of
hydrogen is very reactive with most
hydrogen is the least dense of all

1. physical property.  

2. chemical property.

3. chemical property.

4. physical property.

Explanation:

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

1. Hydrogen is a colorless, tasteless, and odorless gas : physical property as there is no change in chemical composition

2. Hydrogen is very combustible in the presence of oxygen :chemical property as there is a change in chemical composition

3. Hydrogen is very reactive with most elements :chemical property as there is a change in chemical composition

4. Hydrogen is the least dense of all elements : physical property as there is no change in chemical composition

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