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Published byRachel Lawrence Modified over 9 years ago
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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?
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Translate the text message using complete words and sentences!
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
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A combination of Chemical formula symbols that represent the elements
in a compound Chemical Formulas The formula of a compound identifies the elements in the compound and the ratio of their atoms.
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Modeling a Chemical Equation
Like a skateboard, a chemical equation has a basic structure. How many complete skateboards can be made from the parts pictured?
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Structure of an Equation
“Reacts to form” Reactant + Reactant → Product + Product Beginning substances Ending Substances
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HNO3 + NaHCO3 --> NaNO3 + CO2 + H2O
2 H2 + O2 ---> 2 H2O How many reactants do the equations have? How many products do the equations have?
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Mass and Chemical Reactions
The total mass of the Law of conservation substances stays the of mass same before and after the reaction
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Conservation of Mass In a chemical reaction, matter is not created or destroyed. What is the mass of iron sulfide produced by this reaction?
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Matter can enter or Open system
escape to the surroundings Matter does not Closed system enter or leave
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Balancing Chemical Equations
Textbook pages
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Chemical Reactions Two or more elements Synthesis or compounds combine
to make a new substance
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Compounds break Decomposition
down into simpler products
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One element replaces Replacement
another element or two elements in different compounds trade places
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Types of Reactions What is each type of reaction represented?
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