elements, compounds and mixtures · elements, compounds and mixtures. elements •consists of only...
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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