Atoms, compounds, and mixtures (oh my!) Catalyst (Left Page): 1. What are some examples of physical properties? 2. What are some examples of chemical changes? 3. How do scientists classify types of matter?
Objectives Identify differences between: atoms and molecules elements and compounds pure substances and mixtures
Classification of Matter 10.21.2008
Objectives Identify differences between: atoms and molecules elements and compounds pure substances and mixtures
atom The word atom comes from the Latin word atomos, which means “indivisible.” This is the smallest particle of matter which has its own identity. We will represent the entire atom as one circle.
Classification of Matter 10.21.2008 Atom Smallest part of matter with its own identity Represented as a circle
molecule The word molecule comes from the Latin word molecula, which means “tiny.” This is any particle which is made of two or more atoms.
Classification of Matter 10.21.2008 Atom Molecule Smallest part of matter with its own identity Represented as a circle Particle made of 2 or more atoms
atom or molecule?
Objectives Identify differences between: atoms and molecules elements and compounds pure substances and mixtures
element An element is made of only one type of atom. Each element has unique physical. & chemical properties An atom is always considered an element. Certain molecules are elements, too.
Classification of Matter 10.21.2008 Atom Molecule Element Smallest part of matter with its own identity Represented as a circle Particle made of 2 or more atoms Unique phys. & chem. Properties Made up of only 1 type of atom
compound A compound is made from two or more different elements. All compounds must therefore be molecules.
Classification of Matter 10.21.2008 Atom Molecule Element Compound Smallest part of matter with its own identity Represented as a circle Particle made of 2 or more atoms Unique phys. & chem. Properties Made up of only 1 type of atom Made of 2 or more elements All compounds are molecules
element or compound?
Objectives Identify differences between: atoms and molecules elements and compounds pure substances and mixtures
pure substance Every particle in a pure substance is identical (exactly the same.) A pure substance can either be an element or a compound.
Classification of Matter 10.21.2008 Atom Molecule Element Compound Pure Substances Smallest part of matter with its own identity Represented as a circle Particle made of 2 or more atoms Unique phys. & chem. Properties Made up of only 1 type of atom Made of 2 or more elements All compounds are molecules Every particle is identical/same Can be element OR compound
mixture A mixture has at least one particle that is not like the others. For now, we will classify mixtures according to their particles. This gives us three choices:
mixture mixture of elements mixture of compounds mixture of both elements and compounds a
mixture mixture of elements mixture of compounds mixture of both elements and compounds
mixture mixture of elements mixture of compounds mixture of both elements and compounds
Classification of Matter 10.21.2008 Element Compound Pure Substances Mixtures - Unique phys. & chem. Properties Made up of only 1 type of atom Made of 2 or more elements All compounds are molecules Every particle is identical/same Can be element OR compound at least one particle NOT the same mixtures with: elements, compounds, elements and compounds
pure substance or mixture?
Processing (Left Page) Take a minute to draw an example of each of the following (using color): 1. Atom 2. Molecule 3. Element 4. Compound 5. Pure Substance 6. Mixture
Practice Problems Draw a compound which has a total of four particles and four atoms per particle. Draw a mixture of elements which is made of three individual atoms and two molecules which have three atoms per particle. Draw a mixture of compounds which is made of four compounds which have two atoms per particle and two compounds which have three atoms per particle.