Chemical Reactions - PowerPoint PPT Presentation

1 / 16
About This Presentation
Title:

Chemical Reactions

Description:

Summarize characteristics of balanced chemical equations (including conservation ... in temperature, color, and/ or odor) that a chemical reaction has occurred. ... – PowerPoint PPT presentation

Number of Views:224
Avg rating:3.0/5.0
Slides: 17
Provided by: ecli65
Category:

less

Transcript and Presenter's Notes

Title: Chemical Reactions


1
Chemical Reactions
2
SC Standards
  • PS-4.6
  • Distinguish between chemical changes (including
    the formation of gas or reactivity with acids)
    and physical changes (including changes in size,
    shape, color, and/ or phase).
  • PS-4.7
  • Summarize characteristics of balanced chemical
    equations (including conservation of mass and
    changes in energy in the form of heat-that is,
    exothermic or endothermic reactions).
  • PS-4.8
  • Summarize evidence (including the evolution of
    gas the formation of a precipitate and/ or
    changes in temperature, color, and/ or odor) that
    a chemical reaction has occurred.
  • PS-4.9
  • Apply a procedure to balance equations for a
    simple synthesis or decomposition reaction.
  • PS-4.10
  • Recognize simple chemical equations (including
    single replacement and double replacement) as
    being balanced or not balanced.
  • PS-4.11
  • Explain the effects of temperature,
    concentration, surface area, and the presence of
    a catalyst on reaction rates.

3
Signs of a Chemical Reaction
  • Production of light
  • Formation of a gas
  • Formation of a precipitate
  • Color change
  • Change in temperature

4
Law of Conservation of Mass
  • mass is neither created nor destroyed in a
    chemical reaction

total mass stays the same
atoms can only rearrange
4 H 2 O
4 H 2 O
36 g
4 g
32 g
5
Chemical Equations
  • AB ? CD

PRODUCTS
REACTANTS
6
Chemical Equations
7
Types of Chemical Reactions
8
Synthesis
  • the combination of 2 or more substances to form a
    compound
  • only one product

A B ? AB
9
Synthesis
  • H2(g) Cl2(g) ? 2 HCl(g)

10
Decomposition
  • a compound breaks down into 2 or more simpler
    substances
  • only one reactant

AB ? A B
11
Decomposition
  • 2 H2O(l) ? 2 H2(g) O2(g)

12
Single Replacement
  • one element replaces another in a compound
  • metal replaces metal ()
  • nonmetal replaces nonmetal (-)

A BC ? AC B
13
Single Replacement
  • Cu(s) 2AgNO3(aq) ? Cu(NO3)2(aq) 2Ag(s)

14
Double Replacement
  • ions in two compounds change partners
  • cation of one compound combines with anion of the
    other

AB CD ? AD CB
15
Double Replacement
  • Pb(NO3)2(aq) K2CrO4(aq) ? PbCrO4(s) 2KNO3(aq)

16
Double Replacement Reaction Lab
Write a Comment
User Comments (0)
About PowerShow.com