Assessment| Recap

___________ are the smallest unit of an element that maintains the properties of that element.

• Atoms

• Elements

• Compounds

• mixtures

A/An _______________ is made up of one or more of the same kind of atom chemically combined.

• atom

• element

• compound

• molecule

A/an _____________ contains a variety of elements and compounds that are not chemically combined with each other.

• atom

• element

• compound

• mixture

A __________________ is a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity.

• mixture

• pure substance

• compound

• element

Elements and compounds are pure substances.

• True

• False

Elements are broadly classified as metals, nonmetals, and _________________.

• compounds

• mixtures

• metalloids

Coffee, mouthwash, and vinegar are examples of __________________ mixtures.

• heterogeneous

• homogeneous

The wind that heralds the harmattan season in Nigeria is the

• Northeastern wind

• Northwestern wind

• Southeastern wind

• Southwestern wind

Ammonia is a colourless gas with the formula NH₃.

Ammonia contains hydrogen and nitrogen and cannot be broken down physically.

Ammonia is a ___________________ .

• compound

• element

A homogeneous mixture is the same thing as...

• a solution

• a heterogeneous mixture

• a compound

• an element