Question

1. which of the following cannot be broken down by chemical or physical means? (1pts)

element
compound
heterogeneous mixture
homogeneous mixture

1. which does not exist as gas? (1pts)

fluorine
argon
hydrogen
boron

Explanation:

For question 3: Elements are pure substances made of only one type of atom, and they cannot be broken down into simpler substances by chemical or physical means. Compounds can be broken down chemically, and mixtures can be separated physically.
For question 4: Fluorine, argon, and hydrogen are all gaseous at standard conditions. Boron is a solid metalloid that does not exist as a gas under normal circumstances.

Answer:

1. element
2. boron