हिंदी

What is a balanced chemical equation? Why should a chemical equation be balanced? - Science

Advertisements
Advertisements

प्रश्न

What is a balanced chemical equation? Why should a chemical equation be balanced?

टिप्पणी लिखिए
Advertisements

उत्तर

The chemical equation in which the number of atoms of each element on both sides is equal is called the balanced equation. A chemical equation should be balanced because there is no loss or gain of any matter during a chemical reaction, i.e., the law of conservation of matter must hold good for the reaction.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 1: Chemical Reactions and Equations - Exercises [पृष्ठ १५]

APPEARS IN

एनसीईआरटी Science [English] Class 10
अध्याय 1 Chemical Reactions and Equations
Exercises | Q 4 | पृष्ठ १५
लखमीर सिंग Chemistry (Science) [English] Class 10
अध्याय 1 Chemical Reactions and Equations
Exercise 1 | Q 21.1 | पृष्ठ १९

वीडियो ट्यूटोरियलVIEW ALL [4]

संबंधित प्रश्न

Write the balanced chemical equation for the following reaction.

\[\ce{Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water}\]


Fill in the following blank with suitable word:

 Chemical equations are balanced to satisfy the law of ............


Write the balanced equation for the following reaction, and add the state symbols:

Sodium hydroxide reacts with sulphuric acid to produce sodium sulphate and water.


When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
(a) Name any two metals which can behave like metal X.
(b) Name any two acids which can behave like acid Y.
(c) Name the gas Z.
(d) Is the gas Z lighter than or heavier than air?
(e) Is the reaction between metal X and dilute acid Y, exothermic or endothermic?
(f) By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.


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


Balance the following equation. Also name the product formed.  

K2O + H2O    → KOH 


In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode?


Write down what you understood from the following chemical reaction.

AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)


Balance the following equation:

PbS + O2 → PbO + SO2


Balance the following equation:

S + H2SO→ SO2 + H2O


Balance the following equation:

 H2O + Cl2 → HCl + O2


The chemical reactions in which heat is liberated are called endothermic reactions.


Define: Endothermic reaction 


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

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

Answer the following:

Write the word equation for the above molecular equation.


Balance the following simple equation:

Fe  +   H2O  ⇌   Fe3O4   +   H2 


Write a balanced equation for the following word equation:

Iron + Hydrochloric acid → Iron [II] chloride + Hydrogen


Match the columns.

  Reactants Products Types of chemical reaction
1. MgH2 Mg + H2 Endothermic
2. 2H2S + SO2 3S + 2H2O Oxidation
3. CaO + H2O Ca(OH)2 + heat Exothermic
        Redox

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSOand NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?

  1.  In beakers A and B, exothermic process has occurred.
  2. In beakers A and B, endothermic process has occurred.
  3. In beaker C exothermic process has occurred.
  4.  In beaker C endothermic process has occurred.

Complete the following blank in the equation as indicated.

\[\ce{CaH2_{(s)} + 2H2O_{( aq)}-> Ca(OH)2_{(s)} + 2H2_{(g)}}\]

Grams: 42 g + ______ `→` ______ + ______


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×