Advertisements
Advertisements
Questions
With the help of an appropriate example, justify that some of the chemical reactions are determined by a change in temperature.
Give a chemical equation for the reaction involved in the above case.
Give one example of a chemical reaction characterised by a change in temperature.
Advertisements
Solution
When quicklime reacts with water, slaked lime forms with the release of a large amount of heat, causing a temperature change in the reaction mixture.
\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\]
Notes
Students should refer to the answer according to their questions.
APPEARS IN
RELATED QUESTIONS
Aluminium burns in chlorine to form aluminium chloride (AlCl3). Write a balanced chemical equation for this reaction.
Write the balanced equation for the following reaction, and add the state symbol:
Sodium hydroxide reacts with sulphuric acid to produce sodium sulphate and water.
The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This law is know as:
(a) law of conservation of momentum
(b) law of conservation of mass
(c) law of conservation of motion
(d) law of conservation of magnetism
Write your observation for the following chemical reaction and name the product formed :
When an aqueous solution of sodium chloride is mixed with an aqueous solution of silver nitrate.
Balance the following equation. Also name the product formed.
` "H"_2"O"_2 → "H" _2 "O" + "O"_2`
Balance the following equation. Also name the product formed.
FeCI2 + CI2 → FeCI3
In the experiment for determining the percentage of water absorbed by raisins, we do the final weighing of the raisins after keeping them dipped in water for about one hour. For the accuracy of the result, the extra water from the surface of the soaked raisins is removed by
State the information conveyed by the following equation:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2 ↑
Balance the following equation:
Fe + H2O → Fe3O4 + H2
Write the balanced chemical equation of the following reaction.
silver nitrate → silver + nitrogen dioxide + oxygen
Write the balanced chemical equation of the following reaction.
aluminium carbide + water → aluminium hydroxide + methane
Considering the relationship in the first pair, complete the second paie :
AgCI : White :: CuI2 : ___________
1 g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name and the color of the products formed in each case.
Name the following:
Two non-metal which react explosively when brought in close contact.
What is meant by ‘reactants’ and ‘products’ in a chemical equation?
Balance the following simple equation:
K + H2O → KOH + H2
CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]
State the information provided by the above chemical equation.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
C2H5OH + 3O2 → 2CO2 + 2H2O
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
3CuO + NH3 → 3Cu + 3H2O + N2
When aqueous solutions of potassium iodide and lead nitrate are mixed an insoluble substance separates out. The chemical equation for the reaction involved is:
