Helium gas is a pure substance
Helium gas is a pure substance
Helium gas is a pure substance
Helium is pure as it is on the periodic table.
No. Helium is an element, which makes it a pure substance.
Neither. Helium is not a mixture at all, it is a pure substance.
Neither. Helium is not a mixture at all, it is a pure substance.
No, helium is a pure substance and an element to be more specific. It has a constant composition making it a pure substance and it is homoatomic (has only one type of atom) which makes it an element.
Yes, it is a pure substance but can be mixed with other gases.
No, it is a gas-solid mixture when view as a whole. It has a solid component (the balloon itself), and a gas component (the helium)
Helium is an element which makes it a pure substance.
Helium is a gas, except at extremely cold temperatures.
No, argon gas is a pure substance and not a heterogeneous mixture. A heterogeneous mixture contains different substances that are visibly distinguishable, whereas argon gas is composed of only argon atoms.