Chemical Equations

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# Chemical Equations - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Chemical Equations' - reilly

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Presentation Transcript
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 Equations

Reactant +Reactant Product

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

Chemical Equations
• Label the parts of the following chemical equation:

4Fe + 3O2 2Fe2O3

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

4Fe + 3O2 2Fe2O3

Products Reactants

Balance Equations Example

Zn + 2HCl  ZnCl2 + ?

Products Reactants

Closed Container Reactions
• In a closed container, the mass of any gas is trapped.
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
• 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 are solid molecules that are arranged in a regular, repeating pattern.