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Questions and Answers
Which of the following best describes a double replacement reaction?
Which of the following best describes a double replacement reaction?
What is a natural example of polymerization?
What is a natural example of polymerization?
What is the balanced equation for the reaction of magnesium with hydrochloric acid?
What is the balanced equation for the reaction of magnesium with hydrochloric acid?
Which of the following compounds can be produced through polymerization?
Which of the following compounds can be produced through polymerization?
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What does the symbol (aq) represent in a chemical equation?
What does the symbol (aq) represent in a chemical equation?
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Which process must be followed to correctly write a chemical equation from word descriptions?
Which process must be followed to correctly write a chemical equation from word descriptions?
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What must be true for a chemical equation to comply with the Conservation of Matter?
What must be true for a chemical equation to comply with the Conservation of Matter?
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Which part of the chemical equation separates the reactants from the products?
Which part of the chemical equation separates the reactants from the products?
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In the equation 2H2 + O2 → 2H2O, what do the coefficients represent?
In the equation 2H2 + O2 → 2H2O, what do the coefficients represent?
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Why is balancing a chemical equation important?
Why is balancing a chemical equation important?
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What is represented by the equation 2H2 + O2 → 2H2O?
What is represented by the equation 2H2 + O2 → 2H2O?
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Which statement about coefficients in chemical equations is incorrect?
Which statement about coefficients in chemical equations is incorrect?
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What is the first step in balancing the equation N2 + H2 = NH3?
What is the first step in balancing the equation N2 + H2 = NH3?
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In a synthesis reaction, which is a defining characteristic?
In a synthesis reaction, which is a defining characteristic?
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Which of the following is an example of a combustion reaction?
Which of the following is an example of a combustion reaction?
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What is typically balanced last during the balancing of a chemical equation?
What is typically balanced last during the balancing of a chemical equation?
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Which reaction type involves breaking down a compound into two or more parts?
Which reaction type involves breaking down a compound into two or more parts?
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When balancing the equation 2H2 + O2 = 2H2O, what coefficient is added in front of H2 on the left side?
When balancing the equation 2H2 + O2 = 2H2O, what coefficient is added in front of H2 on the left side?
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What happens in a single replacement reaction?
What happens in a single replacement reaction?
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Which of the following is NOT a type of chemical reaction described?
Which of the following is NOT a type of chemical reaction described?
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Study Notes
Chemical Equations
- Chemical equations use symbols to represent chemical reactions
- Reactants are written on the left side of the arrow
- Products are written on the right side of the arrow
- The arrow shows the direction of the reaction ("to produce", "to form")
- Subscripts indicate the number of atoms of each element in a compound
- Coefficients are placed in front of formulas to show the mole ratio in the reaction
Phases of Matter
- Solids (s)
- Liquids (l)
- Gases (g)
- (aq) means dissolved in a solvent
Balancing Equations
- Chemical equations must be balanced, meaning the number of atoms of each element must be the same on both sides of the equation
- Coefficients are used to balance equations
Putting it all Together
- Steps to build chemical equations:
- Box the elements/compounds
- Use + and → symbols
- Use parentheses around phase of matter (s), (l), (g), or (aq)
Types of Reactions
-
Synthesis: Two or more reactants combine to form a single product (A + B → AB)
- Examples: C + O₂ → CO₂ , 2H₂ + O₂ → 2H₂O
-
Decomposition: A single reactant breaks down into two or more products (AB → A + B)
- Examples: 2KCIO₃ → 2KCI + O₂ , 2H₂O → O₂ + 2H₂
-
Combustion: A substance reacts with oxygen to produce carbon dioxide and water (fuel + O₂ → CO₂ + H₂O)
- Example: CH₄ + 2O₂ → CO₂ + 2H₂O
-
Single Replacement: One element replaces another in a compound (A + BC → AC + B)
- Examples: Cu + AgNO₃ → Cu(NO₃)₂ + Ag, Zn + 2HCl → ZnCl₂ + H₂
-
Double Replacement: The positive ions (cations) of two ionic compounds exchange places (AB + CD → AD + CB)
- Examples: AgNO₃ + NaCl → NaNO₃ + AgCl, HCl + NaOH → NaCl + H₂O
Polymerization
- Monomers combine to form long chains called polymers
- Examples of synthetic polymers: Nylon, Polyester, Teflon, Plastic, Kevlar
- Examples of natural polymers: RNA, DNA, Protein
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Description
This quiz covers the basics of chemical equations including how to represent reactants and products, the phases of matter, and the importance of balancing equations. You'll learn about different types of chemical reactions and the necessary symbols used in these equations. Test your understanding of the fundamental concepts in chemistry.
