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Chemical Equations. Parts of a chemical equation: Reactants : a substance present at the beginning of a chemical reaction. (Left side) Products : a substance that is produced during a chemical reaction (Right Side)

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Chemical equations
Chemical Equations

  • Parts of a chemical equation:

    • Reactants: a substance present at the beginning of a chemical reaction. (Left side)

    • Products: a substance that is produced during a chemical reaction (Right Side)

    • Coefficient: a number written before a chemical formula to show how many atoms/molecules of a substance are involved in the reaction

    • Arrow: “produces”


Chemical equations1
Chemical Equations

Reactant +Reactant Product

The number of each element must be the same on each side! (balanced)


Chemical equations2
Chemical Equations

  • Label the parts of the following chemical equation:

    4Fe + 3O2 2Fe2O3


Balancing equations
Balancing Equations

  • To determine if an equation is balanced:

    • Make sure the reactants and products contain the same elements.

    • Count the number of atoms of each element in the reactants. Remember to multiply the coefficient by the subscript, if there is one.

    • Count the number of atoms of each element in the products.

    • Check that these numbers are equal. If they are, the equation is balanced.


Balance equations example
Balance Equations Example

4Fe + 3O2 2Fe2O3

Products Reactants


Balance equations example1
Balance Equations Example

Zn + 2HCl  ZnCl2 + ?

Products Reactants


Closed container reactions
Closed Container Reactions

  • In a closed container, the mass of any gas is trapped.


Check point with partners
Check-point with Partners

With use of your coach book partner read (every other paragraph) and summarize.

  • Types of evidence that a chemical reaction has occurred. (should be 4 different ways) (pg. 29)

  • What are the physical properties used to indicate an unknown substance. And what does each mean? (pg. 27- 28)

  • What do filters, sifters, and evaporation have in common? (pg. 24)

  • What is the law of conservation of mass in your own words? (pg.34)


Open container reactions
Open Container Reactions

  • In an open container, if a gas is produced, the mass of the product will be less than the mass of the reactants.

    • Mass escapes from the open container and releases into the air.



Crystals
Crystals

  • Crystals are solid molecules that are arranged in a regular, repeating pattern.


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