Question

Which of the following are physical rather than chemical properties of hydrogen gas (H2)? Choose one or more:

A. Liquefied H2 boils at a very low temperature (–253.7°C).
B. H2 gas does not conduct electricity.
C. At room temperature, its density is less than that of any other gas.
D. It reacts vigorously with oxygen (O2) to form water.

Answer 1

Answer: A. Liquefied
`H_2` boils at a very low temperature (–253.7°C).

B.
`H_2` gas does not conduct electricity.

C. At room temperature, its density is less than that of any other gas.

Step-by-step explanation:

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.

Example:
`H_2` reacts vigorously with oxygen
`O_2` to form water.
`2H_2+O_2\rightarrow 2H_2O`

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.

Example: Liquefied
`H_2` boils at a very low temperature (–253.7°C).It only changes state.

`H_2` gas does not conduct electricity.It is only about movement of electrons.

At room temperature,
`H_2` density is less than that of any other gas. It is only about mass present per unit volume.