unit 6 chemical reactions
Download
Skip this Video
Download Presentation
Unit 6 Chemical Reactions

Loading in 2 Seconds...

play fullscreen
1 / 19

Unit 6 Chemical Reactions - PowerPoint PPT Presentation


  • 170 Views
  • Uploaded on

Unit 6 Chemical Reactions. Objectives. Write chemical equations to describe chemical reactions Balance chemical equations Classify and identify chemical reactions Predict products from chemical reactions. I. Reactions and equations. Chemical reactions: A chemical change has occurred

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Unit 6 Chemical Reactions' - denton


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
objectives
Objectives
  • Write chemical equations to describe chemical reactions
  • Balance chemical equations
  • Classify and identify chemical reactions
  • Predict products from chemical reactions
i reactions and equations
I. Reactions and equations
  • Chemical reactions:
    • A chemical change has occurred
  • Evidence of a chemical reaction
    • Temperature change (energy

change)

    • Change in color
slide4

Evidence of chemical change

    • Gas production (bubbles, fizzing, odor)
    • Formation of a solid (precipitate)
slide5

YouTube - ammonium dichromate volcano

  • YouTube - Nitrogen Triiodide Detonation
  • YouTube - Sodium and Water
  • YouTube - Reaction of Sodium & Chlorine (with subtitles)
slide6

Representing chemical reactions:

    • Reactants: starting substances (written on the left side)
    • Products: substances that result from the reaction (written on the right side)
    • Anarrowiswrittenbetweenreactants and products and isread as “yields”
slide8

Word Equations

    • Statementsusedtoindicatereactants and products
    • Lackimportantinformation
    • Ex.Hydrogen (g) + oxygen (g)  water (l)
  • Skeletonequations
    • Chemical formulas are usedtorepresentreactants and products
    • Ex. H2 (g) + O2 (g)  H2O (l)
learning check
Learning Check:
  • Write the skeleton equations for the following:
  • Hydrogen (g) + Bromine (l)  hydrogen bromide (g)
  • Carbon monoxide (g) + oxygen (g)  carbon dioxide (g)
practice
Practice:
  • Write the skeleton equations for the following:
  • Hydrogen (g) + Bromine (l)  hydrogen bromide (g)

H2 (g) + Br2 (l)  HBr (g)

  • Carbon monoxide (g) + oxygen (g)  carbon dioxide (g)

CO (g) + O2 (g)  CO2 (g)

CW p 284 # 3, p 980 9.1 #1,2

ii balancing chemical equations
II. Balancing chemical equations
  • Chemical equations:
    • Must obey “law of conservation of matter”
    • Must show that the number of atoms of each substance is the same before and after the reaction.
    • A chemical equation has to be BALANCED
    • To balance chemical equations, COEFFICIENTS (whole number)are written in front of a reactant or product.
    • If coefficient is 1, it is not written
slide12

Steps for balancing equations

  • Write the skeleton equation for the reaction. Ex. Hydrogen gas reacts with chlorine gas and yields gaseous hydrogen chloride.

H2 (g) + Cl2 (g)  HCl(g)

  • Count the atoms of each substance for the reactants and products.
slide13

Place coefficients (ONLY IN FRONT OF A REACTANT OR PRODUCT) to make number of atoms of each element equal on both sides of the equation. (#atoms= coefficient x subscript)

H2 (g) + Cl2 (g)  HCl(g)

slide14

Write coefficients in lowest ratio possible

H2 (g) + Cl2 (g)  2HCl(g)

  • Check your answer.
practice1
Practice

1. Write a balanced chemical equation if sulfur trioxide when heated yields sulfur dioxide and oxygen.

slide16

Write a balanced chemical equation for:

Iron (III) oxide iron (II) oxide + oxygen

slide17

Balance the following reaction

CaO + H2O  Ca(OH)2

ad