CHEM151Chapter 3

Chemistry (MasteringChemistry Series)

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
10/20/2008 1 Chapter 3 Formulas, Equations, and Moles: I Chemical Reactions and Equations y What is a chemical reaction? y A chemical equation uses symbols to represent what happens at the atomic level. y What happens when you boil water? What happens during the electrolysis of water the electrolysis of water? 2 Chemical Reactions y Several levels of examining chemical reactions: y Macroscopic changes accompanying the chemical changes y Changes in atomic structure y Symbolic representation of molecular changes y Law of Conservation of Mass y Conservation of atoms y Does the number of molecules need to be conserved? 3
Background image of page 1

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

View Full DocumentRight Arrow Icon
10/20/2008 2 Balancing Equations y Adjust coefficients, not subscripts, to balance an equation y Coefficients are whole-number integers in the lowest ratio y Reactants Æ Products y H 2 + O 2 Æ H 2 O 4 Balancing Equations Coefficients vs. Subscripts Balancing Equations y Balance the equations below. Hint: Think about what subscripts mean in a formula! y H 2 (g) + Br 2 (l) Æ HBr (g) y CO (g) + O 2 (g) Æ CO 2 (g) y Al (s) + Cl 2 (g) Æ AlCl 3 (g) y N 2 (g) + H 2 (g) Æ NH 3 (g)
Background image of page 2
10/20/2008 3 Guidelines to Balancing Equations y Write correct formulas for reactants and products. y Begin balancing with the most complex formula. y
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 09/27/2011.

Page1 / 8

CHEM151Chapter 3 - 10/20/2008 Chapter 3 Formulas,...

This preview shows document pages 1 - 4. Sign up to view the full document.

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