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 8
A student mixes calcium oxide and water and observes the formation of a white, powdery substance. What type of reaction has occurred?
Describe what happens in a combination reaction.
Explain why combination reactions are important in everyday life.
Explain why the reaction between calcium oxide and water is important in construction.
Explain why the reaction between nitrogen and hydrogen to form ammonia is a combination reaction.
State one real-life example of a combination reaction.
What is the product formed when magnesium burns in air?
A student mixes calcium oxide and water and observes the formation of a white, powdery substance. What type of reaction has occurred?
A combination reaction always involves:
(1) Two or more reactants forming one product
(2) One reactant forming two or more products
(3) Exchange of ions between reactants
(4) No change in chemical composition
Which of the following is a combination reaction?
(1) 2H2 + O2 → 2H2O
(2) CaCO3 → CaO + CO2
(3) 2KClO3 → 2KCl + 3O2
(4) AgNO3 + NaCl → AgCl + NaNO3
Which of the following is a combination reaction?
(1) 2KClO3 → 2KCl + 3O2
(2) 2H2 + O2 → 2H2O
(3) 2AgNO3 + Na2SO4 → Ag2SO4 + 2NaNO3
(4) CaCO3 → CaO + CO2
Which of the following is a combination reaction?
(1) 2Na + 2H2O → 2NaOH + H2
(2) 2H2 + O2 → 2H2O
(3) 2KNO3 → 2KNO2 + O2
(4) CaCO3 → CaO + CO2
Fill in the blank: In a combination reaction, two or more substances combine to form a _______.
Fill in the blank: The reaction of calcium oxide with water produces _______.
Fill in the blank: The reaction of carbon monoxide with oxygen to form carbon dioxide is a _______ reaction.
Fill in the blank: The reaction of hydrogen with chlorine to form hydrogen chloride is a _______ reaction.
Is the reaction between calcium oxide and water to form calcium hydroxide a combination reaction? (Yes/No)
Is the reaction: 2Fe + 3Cl2 → 2FeCl3 a combination reaction? (Yes/No)
Is the reaction: 2K + Cl2 → 2KCl a combination reaction? (Yes/No)
Is the reaction: 2SO2 + O2 → 2SO3 a combination reaction? (Yes/No)
