A ballon filled with helium a pure substance or a mixture
The Correct Answer and Explanation is:
A balloon filled with helium is a pure substance.
Helium is a chemical element, meaning it consists of only one type of atom. It is not a mixture because it is not composed of two or more different elements or compounds. Pure substances can be elements or compounds, and in this case, helium falls under the category of an element. Elements like helium have a consistent and uniform composition throughout, which is a key characteristic of pure substances.
When helium is used to fill a balloon, it remains a pure substance unless other gases are added to it, creating a mixture. For instance, if air or another gas is mixed with helium inside the balloon, then the balloon would contain a mixture, not a pure substance. The key distinction here is that helium, when used on its own, does not vary in composition. It will always consist of the same kind of atoms, ensuring that it is a pure substance.
In contrast, mixtures are combinations of two or more different substances, where each substance retains its individual properties. For example, air is a mixture of several gases like nitrogen, oxygen, and carbon dioxide. The properties of a mixture depend on the substances within it, and the components are not chemically bonded.
Thus, a balloon filled exclusively with helium is a container of a pure substance. This is important in various applications, like in scientific experiments or when using helium for inflating balloons, where consistency and purity are required.
