Class Notes (835,574)
United States (324,189)
Chemistry (82)
CHM 103 (17)
Dombi (4)


5 Pages
Unlock Document

CHM 103

Classification of Matter ● Matter ○ Pure Substance ■ Cannot be physically separated ■ Element ● only one type of atom in a sample ■ Compound ● elements are chemically combined in a fixed proportion (ch ● chemical reaction ● (sugar, carbon dioxide) ○ Mixture ■ Can physically be separated ■ elements and or compounds are physically mixed in variable proportions ● (sugar water) ● Homogeneous: a single phase, same throughout, a SOLUTION ● Heterogeneous: some substance will refuse to mix (there will ● be distinct phases) (oil and water) (hydrocarbons hate water) 9/5/2013 What is chemistry? ● study of the physical and compositional changes of matter ● called central science What is Matter? ● anything that has mass, occupies space and is made-up of atoms or parts of atoms What is Mass? ● The amount of matter in an object ● independent of the location of the object ● an object on earth is the same mass on the moon but not the same weight Weight ● weight is a measure of gravitational force acting on an object ● weight depends on the location of the object ● Force = Mass*Acceleration, F=ma Wt=m(gravity ● An object on earth (1lb) weighs .17 lb on the moon. moon has ⅙the gravity of earth Properties of Matter ● Physical Properties of matter ○ physical properties can be observed or measured without changing the composition of the matter being observed ○ Examples of physical properties are: color, shape and mass, and all changes in state ● Chemical Properties of matter ○ chemical prop. can be observed or measured only when the composition of matter is changed ○ examples of chemical properties are flammability and the ability to react ■ (changes in partners on the dance floor would be chem) ● Physical Changes ○ physical changes are reversible ○ take place without a change in composition. atoms are not changing partners ○ nothing new is created ○ examples of physical changes are freezing, (separation are physical changes, all phase changes are Physical changes), melting, or evaporation of a substance ○ separation of compounds is a physical change ● Chemical ○ not always reversible ○ always accompanied by a change in composition. atoms changing partners ○ new types of matter are being created, O2 + 2H2 → 2H2O ○ ex: burning of paper and fizzing of vinegar and baking soda Atoms are the basis of Matter ● Democritus (greek, 500-400 BC) ○ first person who suggested that atoms were the basis of matter ○ atoms comes from the word “atomos” means “no cut” ○ said there were different types of atoms ○ matter was made if atoms and spaces, call the void ○ aristotle, argued against the possibility of a void and the atomic theory was lost for nearly 1500 years ● John Dalton (English, 1766-1844) ○ Father of modern Atomic theory ○ Based on Experimental evidence with gases Dalton Atomic (Particulate) MODEL OF MATTER ● all matter is made up of tiny particles called atoms ● unique types of atoms are called elements ● molecules are collections of bonded atoms ● compound is general term that includes molecules, atoms, and ions (atoms not having normal number of electrons) ● compounds have fixed ratio of atoms ● chemical reactions do not create or destroy atoms ● chemical reactions can create or destroy compounds Chemical View of atom ● nucleus is the center containing protons (+), and neutrons (0) and electrons (-) are on the outside ● atomic number = # of protons, defines the element ● atomic mass = wt of protons and wt of neutrons ● number of electrons = # of protons in neutral atom ● neutron wt = proton + electron ● Protons + Neutrons = nucleon Elements ● elements are pure substances made up of homoatomic molecules or individual atoms of the same kind ● examples are oxygen gas made up of homoatomic mol
More Less

Related notes for CHM 103

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.