chapter2tro - CHEMISTRY 161 Chapter 2 MATTER ATOMS...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CHEMISTRY 161 Chapter 2 MATTER ATOMS MOLECULES ELEMENTS John Dalton matter is composed of building blocks Daltons postulates 1. Elements are composed of small particles called atoms; atoms of an element are identical with same properties (mass) 2. Compounds are composed of atoms of more than one element; in a compound, the ratio of the number of atoms is an integer or fraction LAW OF DEFINITE PROPORTIONS 3. A chemical reaction involves separation and combination of atoms; atoms are neither created nor destroyed an atom is the basic, undividable unit of any element 1. Law of definite proportions 2. Law of conservation of mass in a chemical reaction no gain or loss of mass is observed unit of mass is g (gram) or kilogram (kg) each atom has a constant mass atomic mass atomic weight Structure of an Atom subatomic particles electrons protons neutrons proton,p 1.67262 10 kg +1.6022 10-19 C +1 electron,e 9.10939 10 kg - 1.6022 10-19 C- 1 m(p) / m(e) 1836 the atoms positive charge is located in a small, dense central core nucleus protons are a constituent of the nucleus +...
View Full Document

Page1 / 29

chapter2tro - CHEMISTRY 161 Chapter 2 MATTER ATOMS...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online