Elements, Compounds

and Mixtures

Elements

• Consists of only one type of atom

• Cannot be broken down into a simpler

type of matter by physical or chemical

means

• Can exist as atoms or molecules

– An atom is the smallest component of an

element that has the chemical properties of

the element.

– A molecule is two or more atoms bound

together.

Elements

• Elements are shown on the Periodic

Table of Elements

Element Song

Compounds

• Consists of atoms of two or more elements that are bound together

• Can be broken down into a simpler form of matter (elements) by chemical means

• Has properties that are different than its component elements

• Always contains the same ratio of its component atoms.

Table Salt

Water

Mixtures

• Consists of two or more different

elements and of compounds that are

physically mixed

• Can be separated into its

components by physical means

• Often retains many of the properties

of its components

Mixtures

Types of Mixtures

• Homogeneous

The parts are evenly distributed

ex. Sugar water

• HeterogeneousThe parts of the mixture are not evenly

distributed

ex. Salad dressing

Mint Chip ice cream

Identify the Mixtures (M)

and Compounds (C)

Identify the Mixtures as

Heterogeneous or

Homogenous

Compare and Contrast

• Compare and Contrast Mixtures

and compounds by writing the

characteristic you think…

• Sets a compound apart the most

• Sets a mixture apart the most

• They have the most in common

A physical change occurs when the

substance changes state but does not change

its chemical composition. For example:

water freezing into ice, cutting a piece of

wood into smaller pieces, etc. The form or

appearance has changed, but the properties

of that substance are the same (i.e. it has the

same melting point, boiling point, chemical

composition, etc.)

A chemical change occurs when a substance

changes into something new. This occurs due

to heating, chemical reaction, etc. You can

tell a chemical change has occurred if the

density, melting point or freezing point of the

original substance changes. To identify a

chemical change look for observable signs

such as color change, bubbling and fizzing,

light production, smoke, and presence of

heat.

Physical Chemical

• Temperature

• Hardness

• Density

• State of Matter

• Color (mixture)

• Solubility

– It’s ability to be

dissolved in water

• Bubbling

• Fizzing

• Popping

• New Substance

• Color (New)

Physical and Chemical

Change Video

Identify the Physical (P)

and Chemical (C)

Changes