Question

1. choose the best answer. the relationship between the mass and volume that matter occupies is called ____. density weight malleability flammability 19. choose the best answer. which statement is true about oxygen gas, which is made of two elements of oxygen chemically combined (o₂)? it is a molecule. it is a compound. it is a molecule and a compound.

Explanation:

1. Density is defined as the ratio of mass to volume of a substance. Weight is the force due to gravity acting on a mass. Malleability is the ability of a material to be hammered into thin sheets. Flammability is the ability of a substance to burn. So the relationship between mass and volume of matter is density.
2. A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance made up of two or more different - elements chemically combined. Oxygen gas ($O_2$) is made up of two oxygen atoms (same - element), so it is a molecule but not a compound.

Answer:

1. density
2. It is a molecule.