Atoms Elements Compounds Mixtures

Elements, Compounds, Mixtures

Definitions , Examples, Comparisons

Multiple Select

(check all that apply)

You...

• have mass.

• have volume.

• matter.

Chemistry is the study of matter

• Matter is anything that has mass and occupies space (has volume)

• Composition

• physical properties

• chemical properties

All matter is composed of atoms.

Atoms are the "building blocks" of the universe

Matter exists in 4 fundamental states (a.k.a. 4 phases)

• solid

• liquid

• gas

• plasma

All matter is either a pure substance or a mixture of substances.

(Most everyday items are mixtures)

A pure substance has uniform composition and properties.

Every portion of a pure substance looks and acts the same.

Can be an element or a compound.

An Element

A substance composed of only one type of atom.

Multiple atoms of the same type can be bonded together.

Elements cannot be broken down by chemical means.

Multiple Select

Which of the following are elements?

• He 

• O₂ 

• S₈

• Fe₂O₃

• O₃

Multiple Choice

Hydrogen gas, H₂, can be broken down by chemical means.

• True

• False

A Compound

A substance composed of 2 or more elements chemically bonded.

Component elements have a definite ratio (E.g. 2:1 for H:O in water)

Compounds can be separated by chemical means into their component elements.

Multiple Choice

Water, H₂O, can be broken down by chemical means.

• True

• False

Life

Mixing it up since a while ago

Multiple Select

Which of the following are mixtures

• tap water

• bread flour

• blood

• beach sand

A Mixture

A physical combination of 2 or more pure substances

Mixtures

• Component substances can be separated by physical means.

• Component substances retain their original properties.

Multiple Choice

Which of the following is a mixture?

(circles of different colors represent different types of atoms)

(circles that are touching are chemically bonded)

Multiple Choice

Which of the following is a compound?

(circles of different colors represent different types of atoms)

(circles that are touching are chemically bonded)

Recap

• Matter is anything with mass and volume.

• Matter is made of atoms.

• Matter can be pure or a mixture.

• Elements are made of only one type of atom. Cannot be chemically broken down.

• Compounds are made of 2 or more types of atoms. Can be chemically broken down.