English

How Will You Indicate Exothermic Reaction in a Chemical Equation? - Science

Advertisements
Advertisements

Question

How will you indicate Exothermic reaction in a chemical equation?

Advertisements

Solution

Exothermic reaction is indicated by writing “heat” or “heat energy” or “energy” on the products’ side of a chemical reaction.
Example:  CH4 + 2O2 → CO2 + 2H2O + Heat

shaalaa.com
  Is there an error in this question or solution?
Chapter 1: Chemical Reactions and Equations - Exercise 1 [Page 18]

APPEARS IN

Lakhmir Singh Chemistry (Science) [English] Class 10
Chapter 1 Chemical Reactions and Equations
Exercise 1 | Q 9.2 | Page 18

RELATED QUESTIONS

What does the symbol (aq) represent in a chemical equation?


 Potassium chlorate (KClO3) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction and indicate the evolution of gas.


State one characteristic of the chemical reaction which takes place when dilute hydrochloric acid is added to sodium carbonate.


Name the various types of chemical reactions.


The removal of oxygen from a substance is called:
(a) oxidation
(b) corrosion
(c) reduction
(d) rancidity


A colourless lead salt, when heated, produces a yellow residue and brown fumes.
(a) Name the lead salt.
(b) Name the brown fumes.
(c) Write a chemical equation of the reaction involved.


Balance the following equation. Also name the product formed. 

`"NaNO"_3  → "NaNO"_2  + "O"_2`  Name of product (s)


Balance the following equation Also name the product formed.

`"K" + "CI"_2 → "KCI"`


What is a chemical equation? Why it is necessary to balance it?


\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]

0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of acid required.


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.


In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.

\[\ce{C +2S -> CS2}\]


In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:

Iron [II] sulphate to sodium hydroxide.


Representation of the results of a chemical change – is a chemical equation.

For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓

Answer the following:

Is the equation given above a balanced equation. Give reasons.


Name the following:

The gas evolved when a dilute acid is added to chalk [limestone].


Name the following:

Two gases which react under pressure in presence of a catalyst at elevated temperatures to give a gaseous product.


Give an example of a chemical equation in which two reactants form:

four product


Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

Na2SO3 + HCl → 2NaCl + H2O + SO2


What are reactants? Explain with the help of example.


Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Make a list of the elements in the chemical equation.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×