Chemical Reaction

Which of the following is an example of Combination Reaction?

• C + O₂ → CO₂

• NH₄NO₃ → N₂O + 2H₂O

• 2HCO₃ → H₂O + CO₂ + CO

• 2H₂O₂ → 2H₂O + O₂

Which of the following is an example of combination reaction?

• 2H₂O₂ → 2H₂O + O₂

• 2KMnO₄ → K₂MnO₄ + MnO₂ + O₂

• Ca + O₂ → CaO

• CaCO₃ → CaO + CO₂

Which chemical reaction combines nitrogen gas (N₂) with three molecules of hydrogen gas (H₂) to produce two molecules of ammonia (NH₃), which is widely used in fertilizers and various chemical processes.

• C + O₂ → CO₂

• N₂ + 3H₂ → 2NH₃

• Na + Cl₂ → 2NaCl

• all of the above

Which of the following is an example of decomposition reaction?

• 2Na + Cl₂ → 2NaCl

• C + O₂ → CO₂

• 2Mg + O₂ → 2MgO

• 2H₂O₂ → 2H₂O + O₂

Which of the following is an example of decomposition reaction?

• NaN₃ → Na + N₂

• Na + Cl₂ → 2NaCl

• Fe + S → FeS

• Cu + S → CuS

This reaction is commonly used in cold packs and fireworks. Which chemical reaction happens in thermal decomposition of ammonium nitrate?

• N₂ + 3H₂ → 2NH₃

• 2Ca + O₂ → 2CaO

• NH₄NO₃ → N₂O + 2H₂O

• 4K + O₂ → 2K₂O

Which of the following poster shows importance of chemical reaction?

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For 3 points, write 3-5 sentences of a persuasive essay about how combination reaction and decomposition reaction affects our lives.