Particle Definitions Unit 4

ATOM A single particle that represents an element EXAMPLE:

Molecule Two or more atoms chemically combined/bonded Two or more IDENTICAL or DIFFERENT symbols touching May contain identical or different elements represented by different symbols

Molecule

Turn and Talk ETMLIF … Explain to Me Like I’m Five … Looking at different pictures, how can I determine which are atoms and which are molecules?

Element Anything on the periodic table It is an atom if there is a single particle It is a molecule if there are more than ONE IDENTICAL atoms of an element bonded together EXAMPLES: Gold, Carbon, Helium

Atoms of an Element

Molecules of an Element

Compound Two or more atoms of DIFFERENT elements chemically bonded Two or more different symbols touching ALWAYS REPRESENTED BY A MOLECULE EXAMPLES: Water, Carbon dioxide

Compound

QUIZZICAL QUESTION Which statement below is TRUE? A. All MOLECULES represent a COMPOUND. B. All COMPOUNDS must be represented by a MOLECULE.

Practice! 1.Identify if the picture represents an ATOM or a MOLECULE. 2.Identify if the picture represents an ELEMENT or a COMPOUND.

QUIZZICAL QUESTION A particle diagram shows two circles that are touching each other. How would you determine if this represents a molecule of an element or a molecule of a compound?

Mixture Any combination of two or more elements and/or compounds CAN BE: Heterogeneous: NOT uniform composition, varied composition Homogeneous: uniform composition

Heterogeneous Mixture Examples: Italian salad dressing, ice cubes in soda, pizza

Homogeneous Mixture Examples: Creamer in coffee, laundry detergent, blood