Download - Ch. 11 Chemical Equations
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Ch. 11 Chemical EquationsCh. 11 Chemical Equations
Chemical reaction - One or more reactants change into one or more products
(atoms rearrange their attachments = new substances)
Chemical evidence - (Ch. 2) Bubbles, precipitate, change of temp, change in color
Reactants - A substance present at the start of a reaction
Products - A substance generated in a chemical reaction
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Evidence of a Chemical ChangeEvidence of a Chemical ChangeChemical Change the particles in a compound break apart from their current chemical attachments (bonds) and rearrange to form new attachments. Either to new and different elements or in new amounts of attachments.
Bubbles - (baking soda in vinegar, or bubbles in electrolysis)
Change in temperature - (heat given off in a burning reaction)
Formation of a precipitate - (our lab example)
Sometimes changes in appearance - color, sound, texture, rot
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KC 7 = Write the names of the reactants to the left of a yields arrow separated by “+” signs; then write the names of the products to the right of the arrow also separated by “+” signs
What is “cumbersome” (difficult) about a word equation?So many words to express what can ver y simple thing
when using symbols and formulas (like a shorthand)
Chemical equation = A representation of a chemical reactionNot to be confused with a Chemical Reaction
KC 8 Skeleton equation = write the reactant and product formulasA chemical equation that doesn’t indicate the relative amounts of the reactants and products (no numbers in front)
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Descriptor (Equation Symbol)Similar to adjectives in English, they are extra symbols to enhance the detail in describing a chemical equation
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Coefficient - Small whole numbers that are placed in front of formulas in an equation in order to balance it
Balanced equation - Each side of the equation has the same number of atoms of each element and mass is conserved
Bonds are rearranged
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Chemical ReactivityChemical Reactivity
2H2(g) + O2(g) 2H2O(g)
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Law of Conservation of Mass = the masses have to add up, nothing is created or destroyed, what goes in must come out
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KC 22 Combination (or Synthesis) Decomposition Single replacement Double replacement Combustion
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