Sciencemadness Discussion Board

Pure substances and mixtures

Happiness - 3-4-2015 at 08:39

I'm not sure which answers are correct in the following assignment, so I'd need your help.

Answer the questions with the help of the following pictures. One circle in the pictures presents one atom or ion. One picture can be the right answer for several questions.

Which pictures present:
a) a pure substance
b) a mixture of two elements
c) a mixture of two compounds
d) a mixture of an element and a compound
e) a mixture of atoms and molecules

pure_substances_and_mixtures.jpg - 155kB

DraconicAcid - 3-4-2015 at 08:53

If you have a circle by itself, that's an atom. If you have two or more circles stuck together, that's a molecule. If a molecule has different kinds of circles, that's a compound. If the circles are the same, it's an element.

Happiness - 3-4-2015 at 09:36

Thank you. So, I solved the assignment, and got the following results:

a) B, C, E, I, J, N
b) D, L, M
c) H
d) F, G, K
e) A, F, M

Am I right?

DraconicAcid - 3-4-2015 at 14:28

Looks right.

Happiness - 3-4-2015 at 21:56

Okay, thank you.