This worksheet challenges students to identify various chemical reaction types, including synthesis and decomposition, using equations and visual models.
Chemistry worksheet for classifying types of reactions with equations and diagrams.
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Show Answer Key & Explanations
Step-by-step solution for: Types of Reactions worksheet
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Show Answer Key & Explanations
Step-by-step solution for: Types of Reactions worksheet
Here’s the solution to the worksheet, with explanations for each type of chemical reaction:
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a. KClO₃ → KCl + O₂
✔ Decomposition
*Explanation:* One compound (potassium chlorate) breaks down into two simpler substances (potassium chloride and oxygen gas). This is a classic decomposition reaction.
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b. NaOH + FeCl₃ → NaCl + Fe(OH)₃
✔ Double Displacement
*Explanation:* The positive ions (Na⁺ and Fe³⁺) switch partners with the negative ions (OH⁻ and Cl⁻), forming two new compounds. Also called a metathesis reaction.
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c. K + H₂O → KOH + H₂
✔ Single Displacement
*Explanation:* Potassium (K), a more reactive metal, displaces hydrogen from water (H₂O), forming potassium hydroxide and hydrogen gas. A single element replaces another in a compound.
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d. CaBr₂ + Na₂CO₃ → CaCO₃ + NaBr
✔ Double Displacement
*Explanation:* Calcium and sodium switch anions — Br⁻ and CO₃²⁻ — to form new compounds. Note: The equation isn’t balanced (should be 2NaBr), but the *type* is still double displacement.
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e. C₁₂H₂₂O₁₁ + 12 O₂ → 12 CO₂ + 11 H₂O
✔ Combustion
*Explanation:* A hydrocarbon (sucrose) reacts with oxygen to produce carbon dioxide and water — the hallmark of combustion reactions.
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f. ○ + ● → ○●
✔ Synthesis
*Explanation:* Two elements (or simple substances) combine to form one compound. This is the simplest form of synthesis.
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g. ◉ + ○● → ◉● + ○
✔ Single Displacement
*Explanation:* The gray circle (element) displaces the white circle from the compound ○●, forming a new compound ◉● and releasing ○. Classic single replacement.
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h. ◉○● → ○● + ◉
✔ Decomposition
*Explanation:* One compound breaks apart into two simpler substances — an element (◉) and a diatomic molecule (○●).
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i. ○○● + ◉◉ → ○◉ + ◉○●
✔ Double Displacement
*Explanation:* Two compounds react and exchange parts. The ○● part switches from being bonded to ○ to being bonded to ◉, while ◉ swaps partners. (Note: This is a bit abstract, but fits double displacement pattern.)
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j. Two or more substances form a new substance
✔ Synthesis
*Explanation:* Definition of synthesis — A + B → AB
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k. One substance breaks down into two or more simpler substances
✔ Decomposition
*Explanation:* Definition of decomposition — AB → A + B
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l. One element replaces another element in a compound
✔ Single Displacement
*Explanation:* Definition — A + BC → AC + B
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m. Two compounds are combined and switch partners
✔ Double Displacement
*Explanation:* Definition — AB + CD → AD + CB
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n. Burning results in water and carbon dioxide
✔ Combustion
*Explanation:* Combustion of organic compounds (like hydrocarbons) typically produces CO₂ and H₂O.
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o. A + B → AB
✔ Synthesis
*Explanation:* Two reactants combine to make one product.
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p. AB → A + B
✔ Decomposition
*Explanation:* One reactant breaks into two products.
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q. AB + CD → AD + CB
✔ Double Displacement
*Explanation:* Ions swap partners between two compounds.
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r. AB + C → AC + B
✔ Single Displacement
*Explanation:* Element C displaces B from compound AB to form AC and free B.
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a. Decomposition
b. Double Displacement
c. Single Displacement
d. Double Displacement
e. Combustion
f. Synthesis
g. Single Displacement
h. Decomposition
i. Double Displacement
j. Synthesis
k. Decomposition
l. Single Displacement
m. Double Displacement
n. Combustion
o. Synthesis
p. Decomposition
q. Double Displacement
r. Single Displacement
Let me know if you’d like a visual diagram or mnemonic to remember these!
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a. KClO₃ → KCl + O₂
✔ Decomposition
*Explanation:* One compound (potassium chlorate) breaks down into two simpler substances (potassium chloride and oxygen gas). This is a classic decomposition reaction.
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b. NaOH + FeCl₃ → NaCl + Fe(OH)₃
✔ Double Displacement
*Explanation:* The positive ions (Na⁺ and Fe³⁺) switch partners with the negative ions (OH⁻ and Cl⁻), forming two new compounds. Also called a metathesis reaction.
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c. K + H₂O → KOH + H₂
✔ Single Displacement
*Explanation:* Potassium (K), a more reactive metal, displaces hydrogen from water (H₂O), forming potassium hydroxide and hydrogen gas. A single element replaces another in a compound.
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d. CaBr₂ + Na₂CO₃ → CaCO₃ + NaBr
✔ Double Displacement
*Explanation:* Calcium and sodium switch anions — Br⁻ and CO₃²⁻ — to form new compounds. Note: The equation isn’t balanced (should be 2NaBr), but the *type* is still double displacement.
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e. C₁₂H₂₂O₁₁ + 12 O₂ → 12 CO₂ + 11 H₂O
✔ Combustion
*Explanation:* A hydrocarbon (sucrose) reacts with oxygen to produce carbon dioxide and water — the hallmark of combustion reactions.
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f. ○ + ● → ○●
✔ Synthesis
*Explanation:* Two elements (or simple substances) combine to form one compound. This is the simplest form of synthesis.
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g. ◉ + ○● → ◉● + ○
✔ Single Displacement
*Explanation:* The gray circle (element) displaces the white circle from the compound ○●, forming a new compound ◉● and releasing ○. Classic single replacement.
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h. ◉○● → ○● + ◉
✔ Decomposition
*Explanation:* One compound breaks apart into two simpler substances — an element (◉) and a diatomic molecule (○●).
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i. ○○● + ◉◉ → ○◉ + ◉○●
✔ Double Displacement
*Explanation:* Two compounds react and exchange parts. The ○● part switches from being bonded to ○ to being bonded to ◉, while ◉ swaps partners. (Note: This is a bit abstract, but fits double displacement pattern.)
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j. Two or more substances form a new substance
✔ Synthesis
*Explanation:* Definition of synthesis — A + B → AB
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k. One substance breaks down into two or more simpler substances
✔ Decomposition
*Explanation:* Definition of decomposition — AB → A + B
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l. One element replaces another element in a compound
✔ Single Displacement
*Explanation:* Definition — A + BC → AC + B
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m. Two compounds are combined and switch partners
✔ Double Displacement
*Explanation:* Definition — AB + CD → AD + CB
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n. Burning results in water and carbon dioxide
✔ Combustion
*Explanation:* Combustion of organic compounds (like hydrocarbons) typically produces CO₂ and H₂O.
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o. A + B → AB
✔ Synthesis
*Explanation:* Two reactants combine to make one product.
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p. AB → A + B
✔ Decomposition
*Explanation:* One reactant breaks into two products.
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q. AB + CD → AD + CB
✔ Double Displacement
*Explanation:* Ions swap partners between two compounds.
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r. AB + C → AC + B
✔ Single Displacement
*Explanation:* Element C displaces B from compound AB to form AC and free B.
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✔ Final Answer Key:
a. Decomposition
b. Double Displacement
c. Single Displacement
d. Double Displacement
e. Combustion
f. Synthesis
g. Single Displacement
h. Decomposition
i. Double Displacement
j. Synthesis
k. Decomposition
l. Single Displacement
m. Double Displacement
n. Combustion
o. Synthesis
p. Decomposition
q. Double Displacement
r. Single Displacement
Let me know if you’d like a visual diagram or mnemonic to remember these!
Parent Tip: Review the logic above to help your child master the concept of identifying types of reactions worksheet.
