Textbook Notes (367,844)
United States (205,882)
Chemistry (10)
CHEM 1030 (4)
Chapter 2

chem1030 chapter 2 notes: Atoms, Molecules, and Ions

5 Pages
Unlock Document

CHEM 1030
Marla Spergel

Chapter 2 Atoms Molecules and IonsAtomic Theory of Matter o The theory that atoms are the fundamental building blocks of matter reemerged in the early 19th century championed by John DaltonDaltons Postulates o Each element is composed of extremely small particles called atoms o All atoms of a given element are identical to one another in mass and other properties but the atoms of one element are different from the atoms of all other elements o Atoms of an element are not changed into atoms of a different element by chemical reactions atoms are neither created nor destroyed in chemical reactions o Compounds are formed when atoms of more than one element combine a given compound always has the same relative number and kind of atomsLaw of Constant Composition Joseph Proust 17541826 o This is also known as the law of definite proportions states that the elemental composition of a pure substance never variesLaw of Conservation of Mass o The total mass of substances present at the end of a chemical process is the same as the mass of substances present before the process took placeThe electron o Streams of negatively charged particles were found to emanate from cathode tubes o J J Thompson is credited with their discovery 1897 8 Thompson measured the chargemass ratio of the electron to be 17610 coulombsgMillikan Oil Drop Experiment o Once the chargemass ratio of the electron was known determination of either the charge or the mass of an electron would yield the other o Robert Millikan University of Chicago determined the charge on the electron in 1909Radioactivitythe spontaneous emission of radiation by an atom o It was first observed by Henri Becquerel Marie and Pierre Curie also studied it o Three types of radiation were discovered by Ernest Rutherford particles particles rays
More Less

Related notes for CHEM 1030

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.