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Answered on 13 Apr Learn NCERT Solutions
Sadika
The type of reaction taking place is a chemical reaction, specifically an exothermic reaction, in which quicklime (calcium oxide) reacts with water to form calcium hydroxide (slaked lime) and release heat.
read lessAnswered on 13 Apr Learn NCERT Solutions
Sadika
Saturated hydrocarbons contain only single carbon-carbon bonds and are fully saturated with hydrogen atoms. An example is methane (CH4). Unsaturated hydrocarbons contain at least one carbon-carbon double or triple bond and may not be fully saturated with hydrogen atoms. An example is ethene (C2H4), which contains a carbon-carbon double bond.
read lessAnswered on 13 Apr Learn NCERT Solutions
Sadika
Catenation Property of Carbon: Carbon exhibits the property of catenation, which is the ability of an element to form covalent bonds with other atoms of the same element to form long chains or rings. This property is unique to carbon due to its small atomic size, intermediate electronegativity, and ability to form stable covalent bonds with itself through sp3 hybridization. Carbon atoms can form single, double, or triple bonds with each other, allowing for the formation of a wide variety of organic compounds with diverse structures and properties.
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Answered on 13 Apr Learn NCERT Solutions
Sadika
Answered on 13 Apr Learn Metals and Non Metals
Sadika
Element A Burning with Golden Flame in Air and Reacting with Element B:
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Answered on 13 Apr Learn Metals and Non Metals
Sadika
(a) The ore that produces brisk effervescence with dilute hydrochloric acid is a carbonate ore. Carbonate ores include minerals such as limestone (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
To obtain metal from the enriched ore, the following steps are typically required:
(b) When a copper coin is immersed in a silver nitrate (AgNO3) solution, a displacement reaction occurs, where copper from the coin displaces silver from the silver nitrate solution. As a result, the surface of the coin becomes coated with silver, giving it a silvery appearance.
The balanced chemical equation for the reaction is: Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)
In this reaction, copper (Cu) from the coin reacts with silver nitrate (AgNO3) to form copper(II) nitrate (Cu(NO3)2) in solution and silver (Ag) metal, which precipitates out and coats the surface of the copper coin.
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Answered on 13 Apr Learn Acids, Bases and Salts
Sadika
Plaster of Paris is stored in a moisture-proof container because it is highly hygroscopic, meaning it readily absorbs moisture from the atmosphere. Exposure to moisture can cause Plaster of Paris to undergo premature setting or hardening, rendering it unusable. Storing it in a moisture-proof container helps to maintain its dryness and extend its shelf life.
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Answered on 13 Apr Learn Acids, Bases and Salts
Sadika
When baking soda (sodium bicarbonate, NaHCO3) is heated, it undergoes decomposition to form sodium carbonate (washing soda, Na2CO3), water vapor (H2O), and carbon dioxide gas (CO2). The chemical reaction is: 2NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g)
Answered on 13 Apr Learn Periodic classification of elements
Sadika
Mendeleev classified elements based on their atomic masses and chemical properties. He observed that elements with similar chemical properties occurred at regular intervals when arranged in order of increasing atomic mass. He used this periodicity to classify elements into rows (periods) and columns (groups) in his periodic table.
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Answered on 13 Apr Learn Periodic classification of elements
Sadika
Three points of difference between Mendeleev's Periodic Table and the Modern Periodic Table are:
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