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Questions and Answers
What happens when quicklime is added to water?
What happens when quicklime is added to water?
- Quicklime causes water to freeze and solidify.
- Quicklime dissolves in water and forms a clear solution.
- Quicklime reacts with water to form slaked lime and produces heat and hissing sound. (correct)
- Quicklime causes water to boil and evaporate.
What is the basic difference between a physical change and a chemical change?
What is the basic difference between a physical change and a chemical change?
- In physical change, substances combine to form new compounds, whereas in a chemical change, substances break down into simpler compounds.
- In physical change, new substances are formed, whereas in a chemical change, no new substances are formed.
- In physical change, substances undergo a change in state, whereas in a chemical change, substances undergo a change in composition. (correct)
- In physical change, substances lose their properties, whereas in a chemical change, substances gain new properties.
Why is the volume of gas collected over one electrode double that of gas collected over the other electrode in electrolysis of water?
Why is the volume of gas collected over one electrode double that of gas collected over the other electrode in electrolysis of water?
- Because one electrode is more efficient than the other in producing gas.
- Because the voltage applied to one electrode is higher than the voltage applied to the other electrode.
- Because the electrodes are of different sizes.
- Because water contains hydrogen and oxygen in the ratio of 2:1. (correct)
What type of reaction occurs when white silver chloride is exposed to sunlight?
What type of reaction occurs when white silver chloride is exposed to sunlight?
What is the product formed when quicklime reacts with water?
What is the product formed when quicklime reacts with water?
What is the difference between the arrows ↑ and ↓ in a chemical equation?
What is the difference between the arrows ↑ and ↓ in a chemical equation?
What is the ratio of hydrogen to oxygen in water?
What is the ratio of hydrogen to oxygen in water?
What is the product of the reaction between sodium chloride and silver nitrate?
What is the product of the reaction between sodium chloride and silver nitrate?
What is the difference between the physical change and chemical change?
What is the difference between the physical change and chemical change?
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