Q1. What is Combination Reaction?
Answer: Combination reaction is a type of chemical reaction in which two or more reactants combine to form a single product.
Q2. What is the product formed when water reacts with quicklime?
Answer: Calcium hydroxide is formed when water reacts with quicklime.
Q3. What is the common name of calcium hydroxide?
Answer: Calcium hydroxide is commonly called slaked lime.
Q4. What is the molecular formula of calcium hydroxide?
Answer: The molecular formula of calcium hydroxide is Ca(OH)2.
Q5. How do you calculate the molecular mass of Ca(OH)2?
Answer: The molecular mass of Ca(OH)2 is calculated as follows:
Atomic mass of Ca: 40
Atomic mass of O: 16
Atomic mass of H: 1
Molecular mass of Ca(OH)2 = 40 + 16 + 16 + 1 + 1 = 74 g/mol.
Q6. Write the chemical equation for the reaction between water and quicklime?
Answer: CaO + H2O → Ca(OH)2.
Q7. What is the molecular mass of water?
Answer: Molecular mass of water is 18 g/mol.
Q8. What is the molecular mass of calcium oxide?
Answer: Molecular mass of calcium oxide is 56 g/mol.
Q9. In what physical state is the product formed?
Answer: Ca(OH)2 is obtained in solid state. It is seen in powder form.
Q10. What is the physical observation of the reaction between water and calcium oxide?
Answer: The beaker becomes hot.
Q11. Is heat released during the above reaction?
Answer: Yes, heat is released.
Q12. Is the above mentioned reaction endothermic or exothermic?
Answer: The reaction is exothermic.
Q13. Is heat released during the reaction of H2O and CaO?
Answer: Yes, heat is released.
Q14. What is the common name of calcium oxide?
Answer: Calcium oxide is commonly called quick lime.
Q15. What are the uses of calcium hydroxide?
Answer: Calcium hydroxide is used in the paper industry, sewage treatment and is an important starting material for production of ammonia.
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