-brass cap
-bitumen (pitch)
-carbon and manganese oxide
-carbon rod
-ammonium chloride
-zinc case

Classify all of the substances named as an element, compound or a mixture

Element
=
Compound
=
Mixture
=

Element:

Zinc case

Carbon rod

Compound:

Bitumen

ammonium chloride

Mixture:

Brass cap

carbon and manganese oxide

Explanation:

Elements are considered as pure substances that are made up of only one atom. A zinc case is made up of the metal zinc, which has a negative electrical polarity, that works as the anode in a battery.  The carbon rod is also a component you can find in a battery that serves as the cathode.

Compounds are pure substances as well that are made up of two or more atoms chemically bonded. They cannot be separated through physical means. Examples would be bitumen (pitch) which is a hydrocarbon. Ammonium chloride, is an inorganic compound. It is a salt that can be used as a diuretic.

Mixtures are made up of two or more substances or solutions. They are not chemically bonded, so that means that there are physical ways to separate them. A brass cap is a mixture of different metals, specifically zinc and copper.

Carbon and manganese is a powdered mixture that can be found inside a battery or a dry cell as well. When the battery is powered up, this mixture is then converted into a compound called manganese dioxide.