Chapters
Chapter 6: Chemical Reactions
Exercise-1 [Page 73]
Selina solutions for Concise Chemistry Class 8 ICSE Chapter 6 Chemical Reactions Exercise-1 [Page 73]
Define a chemical reaction.
What happens during a chemical reaction ?
What do you understand by a chemical bond ?
Give one example each of which illustrates the following characteristics of a chemical reaction:
evolution of a gas
Give one example each of which illustrates the following characteristics of a chemical reaction:
change of colour
Give one example each of which illustrates the following characteristics of a chemical reaction change in state
How do the following help in bringing about a chemical change?
pressure.
How do the following help in bringing about a chemical change?
light.
How do the following help in bringing about a chemical change?
catalyst .
How do the following help in bringing about a chemical change?
heat.
Define; catalyst.
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Name three biochemical catalysts found in the human body.
What do you observe when dilute sulphuric acid is added to granulated zinc?
What do you observe when a few pieces of iron are dropped in a blue solution of copper sulphate?
What do you observe when silver nitrate is added to a solution of sodium chloride?
What do you observe when ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.
What do you observe when when dilute sulphuric acid is added to barium chloride solution ?
Complete and balance the following chemical equations:
`"N"_2` + `"O"_2` `→`
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Complete and balance the following chemical equations
Na + H2 O →
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Complete and balance the following chemical equations:
\[\ce{Pb(NO3)2->[heat]}\] _________
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Exercise-2 [Pages 85 - 86]
Selina solutions for Concise Chemistry Class 8 ICSE Chapter 6 Chemical Reactions Exercise-2 [Pages 85 - 86]
Fill in the blank
A reaction in which two or more substances combine to form a single substance is called a ............ reaction.
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Fill in the blank.
The reaction between an acid and a base is called ..................
Fill in the blank .
Soluble bases are called ............
Fill in the blank.
The chemical change involving iron and hydrochloric acid illustrates a ...............reaction.
Fill in the blank
In the type of reaction called ....................................., ions two compounds exchange their positive and negative radicals ions respectively.
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
Fill in the blank
The chemical reaction between hydrogen and chlorine is a ................ reaction
Fill in the blank
When a piece of copper is added to silver nitrate solution, it turns ............in colour.
Classify the following reactions as combination . Also balance the equations.
Also balance the equations.
(a) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]
(b) Zn(s) +`"H"_2"SO"_4` `→` `"ZnSO"_4` (S) + `"H"_2` (g)
(c) `"AgNO"_3` (aq) + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3`
(d) `"NH"_3` (g) + HCI (g) `→` `"NH"_4` CI (S)
(e) `"CuSO"_4` (aq) + `"H"_2"S"` (g) `→` CuS (S) + `"H"_2"SO"_4` (I)
(f) Zn (S) + `"CuSO"_4` (aq) `→` `"ZnSO"_4` N (aq) + Cu (s)
(g)\[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]
(H) NaOH + HCI `→` NaCI + `"H"_2"O"`
(I) KOH + `"H"_2"SO"_4` `→` `"K"_2"SO"_4` + `"H"_2"O"`
Classify the following reactions as decomposition, Also balance the equations.
(A) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]
(B) Zn(s) +`"H"_2"SO"_4` `→` `"ZnSO"_4` (S) + `"H"_2` (g)
(C) `"AgNO"_3` (aq) + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3`
(D) `"NH"_3` (g) + HCI (g) `→` `"NH"_4` CI (S)
(E) `"CuSO"_4` (aq) + `"H"_2"S"` (g) `→` CuS (S) + `"H"_2"SO"_4` (I)
(F) Zn (S) + `"CuSO"_4` (aq) `→` `"ZnSO"_4` N (aq) + Cu (s)
(g) \[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]
(H) NaOH + HCI `→` NaCI + `"H"_2"O"`
(I) KOH + `"H"_2"SO"_4` `→` `"K"_2"SO"_4` + `"H"_2"O"`
Classify the following reactions as decomposition, Also balance the equations.
(A) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]
(B) Zn(s) +`"H"_2"SO"_4` `→` `"ZnSO"_4` (S) + `"H"_2` (g)
(C) `"AgNO"_3` (aq) + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3`
(D) `"NH"_3` (g) + HCI (g) `→` `"NH"_4` CI (S)
(E) `"CuSO"_4` (aq) + `"H"_2"S"` (g) `→` CuS (S) + `"H"_2"SO"_4` (I)
(F) Zn (S) + `"CuSO"_4` (aq) `→` `"ZnSO"_4` N (aq) + Cu (s)
(g) \[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]
(H) NaOH + HCI `→` NaCI + `"H"_2"O"`
(I) KOH + `"H"_2"SO"_4` `→` `"K"_2"SO"_4` + `"H"_2"O"`
Classify the following reactions as decomposition, Also balance the equations.
(A) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]
(B) Zn(s) +`"H"_2"SO"_4` `→` `"ZnSO"_4` (S) + `"H"_2` (g)
(C) `"AgNO"_3` (aq) + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3`
(D) `"NH"_3` (g) + HCI (g) `→` `"NH"_4` CI (S)
(E) `"CuSO"_4` (aq) + `"H"_2"S"` (g) `→` CuS (S) + `"H"_2"SO"_4` (I)
(F) Zn (S) + `"CuSO"_4` (aq) `→` `"ZnSO"_4` N (aq) + Cu (s)
(g) \[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]
(H) NaOH + HCI `→` NaCI + `"H"_2"O"`
(I) KOH + `"H"_2"SO"_4` `→` `"K"_2"SO"_4` + `"H"_2"O"`
Classify the following reactions as neutralization .Also balance the equations.
Also balance the equations.
(A) \[\ce{CaCO3(s)->[heat]CaO(s)+CO2(g)}\]
(B) Zn(s) +`"H"_2"SO"_4` `→` `"ZnSO"_4` (S) + `"H"_2` (g)
(C) `"AgNO"_3` (aq) + NaCI (aq) `→` Ag CI (S) + `"NaNO"_3`
(D) `"NH"_3` (g) + HCI (g) `→` `"NH"_4` CI (S)
(E) `"CuSO"_4` (aq) + `"H"_2"S"` (g) `→` CuS (S) + `"H"_2"SO"_4` (I)
(F) Zn (S) + `"CuSO"_4` (aq) `→` `"ZnSO"_4` N (aq) + Cu (s)
(G) \[\ce{Ca(s)O2(g)->[heat]CaO(s)}\]
(H) NaOH + HCI `→` NaCI + `"H"_2"O"`
(I) KOH + `"H"_2"SO"_4` `→` `"K"_2"SO"_4` + `"H"_2"O"`
Define precipitation.
Define neutralization.
Define catalyst.
Explain the following types of chemical reactions giving two examples for them combination reaction.
Explain the following types of chemical reactions giving two examples for each of them decomposition reaction .
Explain the following types of chemical reactions giving two examples for each of them displacement reaction.
Explain the following types of chemical reactions giving two examples for each of them double decomposition reaction.
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
Write the missing reactants and products and balance the equations.
\[\ce{KCIO3 ->[heat]}\] ___________+ ____________
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
How will you obtain Magnesium oxide from magnesium.
Also give balanced equations for the reactions
How will you obtain Silver chloride from silver nitrate.
Also give balanced equations for the reactions
How will you obtain Nitrogen dioxide from lead nitrate.
Also give balanced equations for the reactions
How will you obtain Zinc chloride from zinc.
Also give balanced equations for the reactions
How will you obtain Ammonia from nitrogen.
Also give balanced equations for the reactions
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
What do you observe when Phenolphthalein is added to sodium hydroxide solution.
What do you observe when Blue litmus paper is dipped in dilute hydrochloric acid.
What do you observe when Lead nitrate is heated.
What do you observe when Magnesium ribbon is burnt in oxygen.
What do you observe when Ammonia is brought in contact of hydrogen chloride.gas.
Give reason .
A person suffering from acidity is advised to take an antacid.
Give reason.
Acidic soil is treated with quick lime.
Give reason.
Wasp sting is treated with vinegar.
What is meant by the metal reactivity series ? State its importance, (any two points).
What are oxides ?
Give two examples Basic oxide .
Give two examples of oxides.
Acidic oxide.
Give two examples of oxides.
Amphoteric oxide
Give two examples of oxides.
Neutral oxide
Define exothermic reactions. Give two examples of each.
Define endothermic reactions. Give two examples of each.
State the effect of an endothermic reaction.
State the effect of an exothermic reaction on the surroundings.
What do you observe when an acid is added to a basic solution.
What do you observe when ammonium chloride is dissolved in water.
Chapter 6: Chemical Reactions
Selina solutions for Concise Chemistry Class 8 ICSE chapter 6 - Chemical Reactions
Selina solutions for Concise Chemistry Class 8 ICSE chapter 6 (Chemical Reactions) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Chemistry Class 8 ICSE solutions in a manner that help students grasp basic concepts better and faster.
Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.
Concepts covered in Concise Chemistry Class 8 ICSE chapter 6 Chemical Reactions are Types of Reactions - Combination, Types of Reactions - Decomposition, Types of Reactions - Displacement, Types of Reactions - Double Displacement, Reactivity Series - in Reactivity Series Metals Are Arranged in Order of Their Reactivity, Reactivity Series - Metal that Displaces the Metal Ion from the Solution is More Reactive., Predict the Reactivity of Metals, Endothermic and Exothermic Processes/ Reactions, Neutralization Reaction, Decomposition Reactions to Form Oxides, Classification of Oxides - Metal Oxides Are Basic, Classification of Oxides - Nonmetal Oxides Are Acidic in Nature, Classification of Oxides - Basic Oxides React with Acids, Amphoteric Oxides - Some Oxides Such as Zno, Pbo React Both with Acids and Bases, Concept for Chemical Reactions.
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