Understanding Chemical Reactions

What is the general formula for a synthesis reaction?

• A + B yields AB

• AB yields A + B

• A + BC yields AC + B

• AB + CD yields AD + CB

What is produced during photosynthesis besides glucose?

• Oxygen

• Nitrogen

• Water vapor

• Carbon dioxide

What happens in a decomposition reaction?

• A compound splits into simpler substances

• Two elements combine to form a compound

• An element replaces another in a compound

• Two compounds exchange ions

What accelerates the decomposition of hydrogen peroxide?

• Heat

• Cold

• Catalyst

• Pressure

What are the products of the combustion of methane?

• Carbon dioxide and water vapor

• Methane and oxygen

• Carbon monoxide and hydrogen

• Hydrogen peroxide and oxygen

Which metal replaces another in a solution of silver nitrate?

• Lead

• Zinc

• Copper

• Iron

What is a key application of thermite reactions?

• Cooking food

• Fireworks

• Airbag deployment

• Railway track maintenance

What is formed when potassium iodide reacts with lead(II) nitrate?

• Lead(II) oxide and potassium iodide

• Lead(II) iodide and potassium nitrate

• Potassium oxide and lead iodide

• Potassium nitrate and lead

What type of reaction is involved when antacids neutralize stomach acid?

• Combustion

• Double replacement

• Synthesis

• Single replacement

Why are chemical reactions crucial for life?

• They sustain natural processes and life

• They only occur in labs

• They produce light only

• They are only used in industrial applications