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Chemical Reactions Take Place…. Every minute of every day both in and around you Examples: Digestion Photosynthesis Car batteries-to start your car Rust. Reactions:. One or more substances, the ___________ change into one or more new substances, the __________. It is written as:

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chemical reactions take place
Chemical Reactions Take Place…
  • Every minute of every day both in and around you
  • Examples:
    • Digestion
    • Photosynthesis
    • Car batteries-to start your car
    • Rust
reactions
Reactions:
  • One or more substances, the ___________ change into one or more new substances, the __________.
    • It is written as:
      • Reactants → Products
    • The arrow means
      • “yields” or “reacts to produce”

reactants

products

explanation
Explanation:
  • An explanation was proposed by _____________ who stated in his atomic theory that in a chemical reaction, the way in which atoms are joined together are changed.
  • As reactants are converted to new products, __________that hold atoms together are __________ and new ones are formed.

Dalton

bonds

broken

explanation1
Explanation:
  • Daltons atomic theory explains the ____________________________.
    • Which States:
      • In any physical or chemical change mass is neither created nor destroyed.
      • The atoms in the products are the same atoms that were in the reactants, they are just arranged differently.

Law of Conservation of Mass

explanation practice
Explanation/Practice:

left

  • In a word equation, reactants are written on the ___________ and products are written on the ________.
  • Write the equation for…
    • Copper can be produced by heating copper (II) sulfide with oxygen. Sulfur dioxide is also produced.
    • Water is formed by the explosive reaction between hydrogen and oxygen

right

answers
Answers
  • Copper(II)sulfide + Oxygen → Copper + Sulfer dioxide
  • Hydrogen + Oxygen → Water (Dihydrogen monoxide)
meaning of chemical formula
Meaning of Chemical Formula

Chemical

Symbol Meaning Composition

H2O One molecule

of water:

Two H atoms and one O atom

2 H2O Two molecules

of water:

Four H atoms and two O atoms

H2O2 One molecule

of hydrogen

peroxide:

Two H atoms and two O atoms

meaning of chemical formula1
Meaning of Chemical Formula

subscript

  • When a __________is written after the chemical symbol for an element it indicates the___________________.
  • When a coefficient is written in front of an atom or molecule it indicates the ____________ of that atom or molecule that is present.
  • If there are subscripts in that atom/molecule they need to be ____________ by the coefficient.

# of that element

number

multiplied

reactants products
Reactants  Products

Unbalanced

Timberlake, Chemistry 7th Edition, page 164

unbalanced and balanced equations
Unbalanced and Balanced Equations

H

Cl

Cl

H

H

Cl

H

Cl

Cl

Cl

H

Cl

H

H

H2 + Cl2 2 HCl (balanced)

H2 + Cl2 HCl (unbalanced)

reactants products

reactants products

H

H

2 1

2 2

Cl

Cl

2 1

2 2

Timberlake, Chemistry 7th Edition, page 167

how do we go from unbalanced to balanced equations
How do we go from Unbalanced to Balanced Equations?
  • You ____________ change the formula of your atom/ion/molecule!
  • This means you may not change the ___________ !
  • Instead, you may put a coefficient __________ of your atom/ion/molecule to balance the number of atoms after you have ___________ it by the subscript

MAY NOT

subscript

in front

multiplied

ch 4 2 o 2 co 2 2 h 2 o
CH4 + 2 O2 CO2 + 2 H2O

Reactants Products

1 C atom 1 C atom

4 H atoms 4 H atoms

4 O atoms 4 O atoms

Balanced!

Timberlake, Chemistry 7th Edition, page 167

balancing steps
Balancing Steps

1. Write the unbalanced equation.

2. Count atoms on each side.

3. Add coefficients as needed to make #s equal on both sides of the equation.

Coefficient  subscript = # of atoms

4. Reduce coefficients to lowest possible ratio, if necessary.

5. Double check atom balance!!!

helpful tips
Helpful Tips
  • Balance one element at a time.
  • Update ALL atom counts after adding a coefficient.
  • If an element appears more than once per side, balance it last.
  • Balance polyatomic ions as single units.
    • “1 SO4” instead of “1 S” and “4 O”
balancing example
Balancing Example

Al + CuCl2 Cu + AlCl3

Al

Cu

Cl

Aluminum and copper(II) chloride react to form copper and aluminum chloride.

2

3

3

2

 2

 6

1 1

1 1

2 3

2 

3 

6 

 3

more examples
More Examples…

4

5

P + O2→ P4O10

H2 + O2→ H2O

BaCl2 + H2SO4→ BaSO4 + HCl

Cu + AgNO3 → Cu(NO3)2 + Ag

CaCO3 + HCl → CaCl2 + H2CO3

2

2

2

2

2

2