Combination Reactions

Chemistry ⇒ Chemical Reactions and Equations

Combination Reactions starts at 7 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Combination Reactions. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 10

A student claims that the reaction between calcium oxide and water to form calcium hydroxide is a combination reaction. Do you agree? Explain your answer.

A student mixes 2 g of magnesium with oxygen and obtains 3.3 g of magnesium oxide. Is this a combination reaction?

Describe the difference between a combination reaction and a decomposition reaction.

Explain why the reaction between carbon dioxide and water to form carbonic acid is a combination reaction.

Explain why the reaction between hydrogen and chlorine to form hydrogen chloride is classified as a combination reaction.

Write a balanced chemical equation for the combination reaction between magnesium and oxygen.

Write the balanced chemical equation for the combination reaction between nitrogen and hydrogen to form ammonia.

Write the balanced chemical equation for the combination reaction between potassium and bromine.

Write the balanced chemical equation for the combination reaction between sulfur dioxide and oxygen to form sulfur trioxide.

A chemist combines 4 g of hydrogen with 32 g of oxygen to form water. Calculate the mass of water formed and state whether this is a combination reaction.

A student observes that when iron(III) oxide reacts with carbon monoxide, iron and carbon dioxide are formed: Fe₂O₃ + 3CO → 2Fe + 3CO₂. Is this a combination reaction? Justify your answer.

Consider the reaction: SO₃ + H₂O → H₂SO₄. Explain why this reaction is classified as a combination reaction and discuss the importance of such reactions in industrial processes.

Explain, with a balanced chemical equation, how combination reactions can be used to prepare slaked lime in the construction industry.