Advertisements
Advertisements
Question
What is thermit process? Where is this process used? Write a balanced chemical equation for the reaction involved.
Solution
In thermite reaction, iron oxide reacts with aluminium to produce molten iron. It is an exothermic process
The following reaction of iron oxide with aluminium as:
\[\ce{Fe2O3(s) + 2 Al (s)-> 2Fe (l) + Al2O3(s) + heat}\]
This is used to join railway tracks or cracked machine parts because the amount of heat evolved is so large that the metal is produced in the molten state.
APPEARS IN
RELATED QUESTIONS
Balance the following equation and add state symbols:
Zn + HCI → ZnCI2 + H2
Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give an example in support of your answer.
Give one example of an exothermic reaction.
A metal X forms a salt XSO4. The salt XSO4 forms a clear solution in water which reacts with sodium hydroxide solution to form a blue precipitate Y. Metal X is used in making electric wire and alloys like brass.
(a) What do you think metal X could be?
(b) Write the name, formula and colour of salt XSO4.
(c) What is the blue precipitate Y?
(d) Write a chemical equation of the reaction which takes place when salt XSO4 reacts with sodium hydroxide solution. Give the state symbols of all the reactants and products which occur in the above equation.
A white precipitate can be obtained by adding dilute sulphuric acid to:
(a) CuSO4 solution
(b) Nacl solution
(c) BaCl2 solution
(d) Na2SO4 solution
Balance the equation stepwise.
SO2(g) + H2S(aq) → S(s) + H2O(l)
Write down what you understood from the following chemical reaction.
AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{ZnCo3->[\triangle] ZnO + CO2}\]
\[\ce{2KClO3->[MnO2] 2KCl + 3O2[g] - is a balanced equation.}\]
State why the compound MnO2 is written above the arrow.
What is called thermolysis reactions?
