Select the correct answer from each drop-down menu. William finds a piece of pure iron in his garden. After a few days, the iron begins to rust. What are the two types of substances involved in the rusting process of iron?
Iron is with one kind of atom that combines with oxygen from the air to form rust (iron oxide). Rust contains two types of atoms, which means it is .

Compound.

Explanation:

Rust contains two types of atoms, which means it is compound. Iron is an element as it contains only one kind of atom, which combines with the oxygen from the air to produce rust, that is, iron oxide.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

f is prop to m1xm2 double m1 double force