ANSWER ALL THE QUESTIONS:-
Q6. Answer the following question:
a) Write the formula of limestone?
b) Name the element present in it?
c) Which gas do we get when limestone is heated strongly?
Q7. What is wrong in the following equation?
H+O-------- H2O
Correct and balance it.
Q8. List the following as exothermic or endothermic reaction:
a) Temperature of water increases on adding sulphuric acid to it.
b) Heat is absorbed when water evaporates.
c) Temperature drops when ammonium chloride dissolves in
water.
Q9. Name the type of chemical reaction when
a) Water is subjected to electrolysis.
b) Calcium carbonate is heated
c) Silver bromide is exposed to sunlight
Q10. Why does aluminium not undergoes corrosion but iron does?
Q11. Name the substance oxidized, reduced, oxidizing agent, reducing
agent in the following:
Pb(s) + 4H2O(aq)------ PbSO4(s)+4H2O(l)
Q13. What is combination reaction?
Q14. What is decomposition reaction?
Answers
Answer:
a.Limestone consists of calcium carbonate, which has the chemical formula CaCO3.
b.elements calcium (symbol Ca), carbon (symbol C) and oxygen (symbol O).
c.When limestone is heated in a kiln, the calcium carbonate breaks down into calcium oxide and carbon dioxide.
Q8 a. In the case of concentrated sulfuric acid, a drop of water added will heat immediately to the boiling temperature of water (100C or a little more because of the acid) and it will flash to steam splashing acid everywhere. ... The water carries off the heat by the phase change from liquid to gas.
b.Evaporation is an endothermic process, in that heat is absorbed during evaporation.
c. when ammonium chloride dissolves in water, the temperature falls because the ammonium chloride is pulling heat in from its surroundings (the water), causing thetemperature to fall. Thus, the energy change is endothermic.so when dissolved in water the solution becomes colder.
Q9 a. The electrolysis of water produces hydrogen and oxygen gases. ... At the anode, water is oxidized to oxygen gas and hydrogen ions. At the cathode, water is reduced to hydrogen gas and hydroxide ions.
b. reaction equation is: CaCO3(s)→CaO(s)+CO2(g) .
c. When silver bromide is kept in sunlight or is exposed to sunlight, it decomposes to form silver metal and bromine vapours: 2AgBr (s) ------------light------------> 2Ag (s) + Br2 (g) This is an example of photolytic decomposition reaction.
Explanation:
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