CHM 111 Lecture Notes - Lecture 3: Unified Atomic Mass Unit, Microsoft Powerpoint

38 views1 pages

Verified Note

bronzeclam342

7 Oct 2018

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

CHM 111 verified notes

3/31View all

CHM 111 Lecture Notes - Lecture 2: Decimal Mark, Scientific Notation, Negative Number

CHM 111 Lecture Notes - Lecture 3: Unified Atomic Mass Unit, Microsoft Powerpoint

CHM 111 Lecture Notes - Lecture 4: Polyatomic Ion, Molar Mass, Periodic Trends

Document Summary

Law of conservation of mass: aka dalton"s atomic theory, states that matter is neither created nor destroyed in chemical reactions, total mass of reactants = total mass of products. Samples from a compound have the same quantity as their component elements. Dalton"s atomic theory: all elements are composed of atoms, atoms from a specific element are different from atoms of other elements, only whole atoms can combine to form a chemical compound. In chemical compounds atoms form in specific ratios: atoms only change the way that they are bounded to other atoms. Discovery of subatomic particles: atomic mass unit (amu): unit used to describe the mass of an atom. Charge of a single electron: -1. 96 x 10-24g. Atomic number: the number of protons in an atom"s nucleus. Atomic number, mass number and isotopes: atomic number = number of protons, mass number = number of protons + number of neutrons. Isotopes: atoms of an element with a different number of neutrons.

Related Questions

rubykangaroo933

In a series of experiments, a chemist prepared three different compounds that contain only iodine and fluorine and determined the mass of each element in each compound:

(a) Calculate the mass of fluorine per gram of iodine in each compound. (b) How do the numbers in part (a) support the atomic theory?

b) When all three numbers are divided with 0.15, it gives: 5, 3, and 7. So, F and I form compounds in constant, whole number ratios. This is a law of multiple proportions and goes along with Dalton’s atomic theory since the F and I atoms combine in known ratios, and the masses of atoms are constant.