The Six Types of Chemical Reaction - Free Printable
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Step-by-step solution for: The Six Types of Chemical Reaction
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Show Answer Key & Explanations
Step-by-step solution for: The Six Types of Chemical Reaction
Let’s go through each of the six types of chemical reactions one by one, using simple language and clear examples so you can understand them easily.
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1) Combustion
This is when something burns — usually with oxygen (O₂). It makes heat, water (H₂O), and carbon dioxide (CO₂).
Example: Burning naphthalene (a smelly solid used in mothballs):
C₁₀H₈ + 12 O₂ → 10 CO₂ + 4 H₂O
Think of it like lighting a candle — wax + oxygen → smoke + heat + water vapor.
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2) Synthesis (Combination)
Two or more simple things join to make one bigger thing.
General form: A + B → AB
Example: Iron + Sulfur → Iron(II) sulfide
Fe + S → FeS
Like mixing flour and eggs to make dough — two ingredients become one new thing.
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3) Decomposition
Opposite of synthesis! One big thing breaks into smaller pieces.
General form: AB → A + B
Example: Water breaks into hydrogen and oxygen gas using electricity:
2 H₂O → 2 H₂ + O₂
Like breaking apart a Lego tower into individual blocks.
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4) Single Displacement
One element kicks out another from a compound.
General form: A + BC → AC + B
Example: Magnesium replaces hydrogen in water:
Mg + 2 H₂O → Mg(OH)₂ + H₂
Imagine swapping seats — magnesium takes hydrogen’s place in water, and hydrogen gets kicked out as gas.
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5) Double Displacement
Two compounds swap partners — like dancing couples switching.
General form: AB + CD → AD + CB
Example: Lead nitrate + potassium iodide → lead iodide (yellow solid!) + potassium nitrate
Pb(NO₃)₂ + 2 KI → PbI₂ + 2 KNO₃
If one product is a solid that doesn’t dissolve, it’s called a precipitation reaction. That yellow stuff? That’s the precipitate!
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6) Acid-Base
Special kind of double displacement. Acid + Base → Salt + Water
General form: HA + BOH → H₂O + BA
Example: Hydrochloric acid + sodium hydroxide → salt + water
HCl + NaOH → NaCl + H₂O
Acids have H⁺ ions, bases have OH⁻ ions. When they meet, they make water — and whatever’s left becomes salt.
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Now let’s check if we missed anything or made any mistakes.
✔ All 6 types are covered.
✔ Each has a definition, general formula, and example.
✔ Examples match the formulas given in your sheet.
✔ No math errors — all equations are balanced as shown.
✔ Language is simple and student-friendly.
You’re ready to answer questions about these reactions now!
Final Answer:
The six types of chemical reactions are:
1) Combustion – burning with oxygen to make CO₂ and H₂O
2) Synthesis – combining simples to make complex (A + B → AB)
3) Decomposition – breaking complex into simples (AB → A + B)
4) Single displacement – one element swaps into a compound (A + BC → AC + B)
5) Double displacement – two compounds swap parts (AB + CD → AD + CB); may form a precipitate
6) Acid-base – acid + base → salt + water (HA + BOH → H₂O + BA)
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1) Combustion
This is when something burns — usually with oxygen (O₂). It makes heat, water (H₂O), and carbon dioxide (CO₂).
Example: Burning naphthalene (a smelly solid used in mothballs):
C₁₀H₈ + 12 O₂ → 10 CO₂ + 4 H₂O
Think of it like lighting a candle — wax + oxygen → smoke + heat + water vapor.
---
2) Synthesis (Combination)
Two or more simple things join to make one bigger thing.
General form: A + B → AB
Example: Iron + Sulfur → Iron(II) sulfide
Fe + S → FeS
Like mixing flour and eggs to make dough — two ingredients become one new thing.
---
3) Decomposition
Opposite of synthesis! One big thing breaks into smaller pieces.
General form: AB → A + B
Example: Water breaks into hydrogen and oxygen gas using electricity:
2 H₂O → 2 H₂ + O₂
Like breaking apart a Lego tower into individual blocks.
---
4) Single Displacement
One element kicks out another from a compound.
General form: A + BC → AC + B
Example: Magnesium replaces hydrogen in water:
Mg + 2 H₂O → Mg(OH)₂ + H₂
Imagine swapping seats — magnesium takes hydrogen’s place in water, and hydrogen gets kicked out as gas.
---
5) Double Displacement
Two compounds swap partners — like dancing couples switching.
General form: AB + CD → AD + CB
Example: Lead nitrate + potassium iodide → lead iodide (yellow solid!) + potassium nitrate
Pb(NO₃)₂ + 2 KI → PbI₂ + 2 KNO₃
If one product is a solid that doesn’t dissolve, it’s called a precipitation reaction. That yellow stuff? That’s the precipitate!
---
6) Acid-Base
Special kind of double displacement. Acid + Base → Salt + Water
General form: HA + BOH → H₂O + BA
Example: Hydrochloric acid + sodium hydroxide → salt + water
HCl + NaOH → NaCl + H₂O
Acids have H⁺ ions, bases have OH⁻ ions. When they meet, they make water — and whatever’s left becomes salt.
---
Now let’s check if we missed anything or made any mistakes.
✔ All 6 types are covered.
✔ Each has a definition, general formula, and example.
✔ Examples match the formulas given in your sheet.
✔ No math errors — all equations are balanced as shown.
✔ Language is simple and student-friendly.
You’re ready to answer questions about these reactions now!
Final Answer:
The six types of chemical reactions are:
1) Combustion – burning with oxygen to make CO₂ and H₂O
2) Synthesis – combining simples to make complex (A + B → AB)
3) Decomposition – breaking complex into simples (AB → A + B)
4) Single displacement – one element swaps into a compound (A + BC → AC + B)
5) Double displacement – two compounds swap parts (AB + CD → AD + CB); may form a precipitate
6) Acid-base – acid + base → salt + water (HA + BOH → H₂O + BA)
Parent Tip: Review the logic above to help your child master the concept of six types of reaction worksheet answers.
