Question

Which of the following best describes the difference between a mixture and a pure substance?
A. A mixture has the same properties throughout; a pure substance has the different properties throughout.

B. A mixture has different properties throughout; a pure substance has the same properties throughout.

C. A mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom.

D. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom.

Answer 1

@Conqueror @Tjbrew

Answer 2

A pure substance has only one kind of atom or molecule.
A mixture has a number of different pure substances mixed together.

Salt- NaCl is a pure substance
Salt dissolved in water is a mixture of salt NaCl and water H2O

Sugar is a pure substance- Sucrose
Sugar and cinnamon is a mixture of the 2 materials

In mixtures, the individual pure components can be separated --- it may be difficult but it can be done

Answer 3

based on the following:
A pure substance has a definite and constant composition — like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary.

An element is composed of a single kind of atom. An atom is the smallest particle of an element that still has all the properties of the element.
A compound is composed of two or more elements in a specific ratio.

I think it is D. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom. What do you think?