Download presentation

Presentation is loading. Please wait.

Published byRonald Hatcher Modified over 3 years ago

1
**Chemical equation the symbolic representation of a chemical reaction (process) wherein the**

reactant entities are on left side and change into product entities on right-hand side

2
**Chemical Equation Symbols**

The arrow can be read as “yields” or “produces” The + sign reads as “and” or “plus”

3
**Chemical Equation Symbols**

The arrow can be read as “yields” or “produces” Coefficients are the numbers in front of the formulas Coefficients can be changed to balance chemical equations Subscripts tell us how many atoms or molecules we have NEVER change subscripts when balancing chem. equations

4
**Balancing Equations like solving a puzzle**

Br2 + Al Al2Br6 (not balanced) Balance using coefficients

5
Balancing Equations Reactants Products O2 + H2 H2O

6
**Balancing Equations Reactants Products**

O2 + H2 H2O but this equation is not balanced why not?

7
Balancing Equations Conservation of Mass- Mass and/or Atoms are not Created or Destroyed during a chemical reaction. There must be the Same number of atoms on each side of the equation to balance the chemical equation.

8
**Steps to Balance Chemical Equations**

1. Write unbalanced equation. 2. Count # atoms on each side. 3. Add coefficients to make #s of atoms equal. Coefficient subscript = # of atoms 4. If necessary reduce coefficients to lowest possible ratio (never change subscripts) Update and Double check atom balance!!!

9
Balancing Equations Step 1. Write unbalanced equation O2 + H2 H2O

10
**Balancing Equations Step 2. Count # of atoms on each side**

O2 + H2 H2O O = = 1 H = H = 2

11
Balancing Equations 3. Add coefficients to make # of atoms = on each side O2 + H2 H2O O = = 1 H = H = 2

12
Balancing Equations 3. Add coefficients to make # of atoms = on each side O H2 2 H2O O = = 2 H = H = 4

13
Balancing Equations 4. If necessary find lowest ratio (never change subscripts) O H2 2 H2O O = = 2 H = H = 4

14
**Balancing Equations 5. Update and double check work O2 + 2 H2 2 H2O**

15
**Balancing Steps Al + CuCl2 Cu + AlCl3**

1. Write the unbalanced equation. Al CuCl2 Cu AlCl3

16
**Balancing Steps 1 Al 1 1 Cu 1 2 Cl 3 1. Write the unbalanced equation.**

2. Count atoms on each side. Al CuCl2 Cu AlCl3 Al 1 Cu Cl

17
**Coefficient subscript = # of atoms**

Balancing Steps 1. Write the unbalanced equation. 2. Count atoms on each side. 3. Add coefficients to make #s equal. Coefficient subscript = # of atoms Al CuCl2 Cu AlCl3 Al 1 Cu Cl

18
**Coefficient subscript = # of atoms**

Balancing Steps 1. Write the unbalanced equation. 2. Count atoms on each side. 3. Add coefficients to make #s equal. Coefficient subscript = # of atoms Al CuCl2 Cu AlCl3 Al 3 Cu Cl

19
**Coefficient subscript = # of atoms**

Balancing Steps 1. Write the unbalanced equation. 2. Count atoms on each side. 3. Add coefficients to make #s equal. Coefficient subscript = # of atoms 2 Al CuCl2 3 Cu AlCl3 Al 3 Cu Cl

20
**Coefficient subscript = # of atoms**

Balancing Steps 1. Write the unbalanced equation. 2. Count atoms on each side. 3. Add coefficients to make #s equal. Coefficient subscript = # of atoms 4. Reduce coefficients to lowest possible ratio, if necessary. 5. Double check atom balance!!!

21
Helpful Tips Balance one element at a time. Balance most complicated compound first! Update ALL atom counts after adding a coefficient. Balance (polyatomic ions) as (single units). “1 SO4” instead of “1 S” and “4 O” Balance most complicated compound first, balance oxygen and hydrogen last (MINOH metals, ions, non-metals, oxygen, hydrogen) Ask yourself this question what am I forced to do to balance the equation???

22
Examples ____ Mg ____ O2 ____ MgO

23
Examples 2 Mg O2 2 MgO

24
Examples ____ Al ____ S ____ Al2S3

25
Examples 2 Al S Al2S3 ____ C3H8 +____ O2 ____ CO2 + ____ H2O

26
Examples 2 Al S Al2S3 C3H8 + 5 O2 3 CO2 + 4 H2O

27
More Examples ___ Al +____ H2SO4 ____Al2(SO4)3 +____ H2

28
More Examples 2 Al + 3 H2SO4 Al2(SO4) H2

29
**Helpful Tips Balance one element at a time.**

Update ALL atom counts after adding a coefficient. Balance (polyatomic ions) as (single units). “1 SO4” instead of “1 S” and “4 O” Balance most complicated compound first, balance oxygen and hydrogen last Ask yourself this question what am I forced to do to balance the equation???

Similar presentations

OK

IIIIIIIVV I.Intro to Reactions Ch. 8 – Chemical Reactions.

IIIIIIIVV I.Intro to Reactions Ch. 8 – Chemical Reactions.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To ensure the functioning of the site, we use **cookies**. We share information about your activities on the site with our partners and Google partners: social networks and companies engaged in advertising and web analytics. For more information, see the Privacy Policy and Google Privacy & Terms.
Your consent to our cookies if you continue to use this website.

Ads by Google

Ppt on simple carburetors Ppt on unemployment in india Ppt on content development examples Ppt on water softening techniques dance Ppt on biodiesel in india Ppt on review writing sample Ppt on cartesian product sql Ppt on e school management system Ppt online downloader games Ppt on condition monitoring training