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Unit: Chemistry Lesson 2: Describing Chemical Reactions Essential Questions: 1.) What information...
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Transcript of Unit: Chemistry Lesson 2: Describing Chemical Reactions Essential Questions: 1.) What information...
Unit: Chemistry
Lesson 2: Describing Chemical Reactions
Essential Questions:1.) What information does a chemical
equation contain?2.) How is mass conserved during a
chemical reaction?3.) What are three types of chemical
reactions?
R u doin chem hw? IDK the chem symbol for H20. Txt me later. Thx.
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Chemical Equation Information
A way to show a Chemical equation
chemical reaction,
using symbols instead
of words
Formulas
A combination of Chemical formula
symbols that
represent the elements
in a compound
Chemical FormulasThe formula of a compound identifies the elements in the compound and the ratio of their atoms.
Modeling a Chemical EquationLike a skateboard, a chemical equation has a basic structure. How many complete skateboards can be made from the parts pictured?
Structure of an Equation
Reactant + Reactant → Product + Product
Beginning substances Ending Substances
“Reacts to form”
How many reactants do the equations have? How many products do the equations have?
HNO3 + NaHCO3 --> NaNO3 + CO2 + H2O
2 H2 + O2 ---> 2 H2O
Mass and Chemical Reactions
The total mass of the Law of conservation
substances stays the of mass
same before and after
the reaction
Conservation of MassIn a chemical reaction, matter is not created or destroyed. What is the mass of iron sulfide produced by this reaction?
Matter can enter or Open system
escape to the
surroundings
Matter does not Closed system
enter or leave
Balancing Chemical Equations
Textbook pages 176-177
Chemical Reactions
Two or more elements Synthesis
or compounds combine
to make a new substance
Compounds break Decomposition
down into simpler
products
One element replacesReplacement
another element or two
elements in different
compounds trade places
Types of ReactionsWhat is each type of reaction represented?