Question

which of the following is a way in which elements and compounds are similar?
elements and compounds can both be broken down by physical means.
elements and compounds are pure substances.
elements and compounds are listed on the periodic table.
elements and compounds are both made up of different kinds of atoms.

Explanation:

• Elements cannot be broken down by physical means. Compounds can be broken down by chemical means, not physical means. So the first option is wrong.
• Only elements are listed on the periodic table. Compounds are not. So the third option is wrong.
• Elements are made up of only one kind of atom. Compounds are made up of different kinds of atoms. So the fourth option is wrong.
• Both elements and compounds are pure substances. A pure substance has a definite and constant composition.

Answer:

Elements and compounds are pure substances.