CHEM 1210 Chapter Notes - Chapter 2: Weighted Arithmetic Mean, Mass Spectrometry, Atomic Number

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periwinklelizard551

9 Apr 2015

School

Ohio State University

Department

Chemistry

Course

CHEM 1210

Professor

A L L

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CHEM 1210 Full Course Notes

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Document Summary

Law of conservation of mass mass of substances produced by a chemical reaction is always equal to the mass of the reactants. Law of constant composition/law of definite proportions a chemical compound always has the same elemental composition by mass. All chemical elements are made up of atoms which are indivisible and indestructible during a chemical change: all atoms of a given element are identical in mass and properties. Elements combine in a simple numerical ratio to form compounds. Law of multiple proportions when two elements combine, the ratios of the masses of one element that combines with the fixed mass of the other are small whole numbers. Radioactivity alpha particles ( ) two units of positive charge. Beta particles ( ) one unite of negative charge. Gamma rays ( ) electromagnetic radiation with high penetrating power. Three subatomic particles: protons (+), electrons (-), neutrons (neutral)

Related Questions

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.