Combustion, Decomposition and Acid/Metal reactions

What is the general equation for a combustion reaction?

• Fuel + Oxygen → Carbon Dioxide + Water + Energy
• Compound → Simpler substances
• CH₄ + 2O₂ → CO₂ + 2H₂O + Energy

• Acid + Metal → Salt + Hydrogen gas

What are the products formed in a combustion reaction?

• Salt and Hydrogen gas
• Carbon dioxide and water
• Salt and Oxygen gas
• Metal oxide and Water

Under what conditions do acid and metal reactions occur?

• In the absence of oxygen
• In the presence of acids
• In the presence of oxygen
• In the presence of metals

What are the products formed in an acid and metal reaction?

• Salts + Oxygen
• Simpler substances
• Carbon Dioxide + Water + Energy
• Salt + Hydrogen gas

Which of the following is an example of a decomposition reaction?

• Acid + Metal → Salt + Hydrogen gas
• CaCO₃ → CaO + CO₂

• 2NaOH → Na₂O + H₂O

• 2H₂O → 2H₂ + O₂

What is formed when an acid reacts with a metal?

• Water and Carbon dioxide gas
• Salt and Hydrogen gas
• Salt and Oxygen gas
• Metal oxide and Water

What happens when metal carbonates undergo a decomposition reaction?

• They react with metals to produce hydrogen gas
• They break down into metal oxides and carbon dioxide gas
• They react with oxygen to produce carbon dioxide and water
• They combine with acids to form salts and hydrogen gas

Under what conditions does a decomposition reaction occur?

• When a compound is heated or exposed to light
• When a metal reacts with an acid
• When an acid reacts with a metal
• When a compound reacts with oxygen

Under what conditions do decomposition reactions occur?

• In the presence of metals
• In the absence of oxygen
• In the presence of oxygen
• In the presence of acids

Under what conditions do combustion reactions occur?

• In the absence of oxygen
• In the presence of acids
• In the presence of metals
• In the presence of oxygen