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 ID: 503726
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Slide1
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”Slide2
Chemical Equations
Reactant +Reactant
Product
The number of each element must be the same on each side! (balanced)Slide3
Chemical Equations
Label the parts of the following chemical equation:
4Fe + 3O
2
2Fe
2
O
3Slide4
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.Slide5
Balance Equations Example
4Fe + 3O
2
2Fe
2
O
3
Products Reactants
Products
=
ReactantsSlide6
Balance Equations Example
Zn + 2HCl
ZnCl
2
+ ?
Products Reactants
Products
=
ReactantsSlide7
Closed Container Reactions
In a closed container, the mass of any gas is trapped.Slide8
Check-point with Partners
With use of your coach book partner read (every other paragraph) and summarize.
T
ypes
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)Slide9
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.Slide10
What do filters, sifters, and evaporation have in common?Slide11Slide12
Crystals
Crystals are solid molecules that are arranged in a regular, repeating pattern.