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SS1: CHEMISTRY – 2ND TERM

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  1. Kinetic Theory of Matter | Week 1
    3 Topics
    |
    2 Quizzes
  2. Kinetic Theory of Matter & Gas Laws 1 | Week 2
    3 Topics
    |
    2 Quizzes
  3. Gas Laws II | Week 3
    3 Topics
    |
    2 Quizzes
  4. Gas Laws III | Week 4
    3 Topics
    |
    2 Quizzes
  5. Gas Laws IV | Week 5
    3 Topics
    |
    2 Quizzes
  6. Mole Concept | Week 6
    5 Topics
    |
    2 Quizzes
  7. Acid, Bases and Salts I | Week 7
    7 Topics
    |
    2 Quizzes
  8. Acid, Bases and Salts II | Week 8
    6 Topics
    |
    2 Quizzes
  9. Acid, Bases and Salts III | Week 9
    3 Topics
    |
    2 Quizzes
  10. Acid, Bases and Salts IV | Week 10
    4 Topics
    |
    1 Quiz
  11. Acid, Bases and Salts V | Week 11
    5 Topics
    |
    1 Quiz
Quiz 16 of 20

SS1: Chemistry 2nd Term Theory Questions – Acid, Bases and Salts II

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Question 1

(a) Define base in terms of the following

(i) Arrhenius  

Answer - Arrhenius defined a base as a substance that produces a hydrous ion (OH-) when dissolved in water or in an aqueous solution e.g. KOH.

(ii) Bronsted-Lowry    

Bronsted-Lowry defined a base as a proton acceptor      

(iii) Lewis

Lewis defined a base as an electron-pair donor  

 

(b)Give two examples each   

(i) Basic Oxide   

Answer - Basic oxide – Na2O, CaO

(ii) Basic Hydroxide

Answer - Basic hydroxide – KOH, NaOH

 

(c)

Answer -

(i) What is Neutralization reaction

Neutralization reaction is a reaction in which acid reacts with a base to form salt and water only.

 

(ii) Using a well-balanced equation give one example of a Neutralization reaction

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

Question 2

(a)  What do you understand by PH of a solution?

Answer - PH of a solution is a measure of the degree of acidity or alkalinity of the solution

(b)Below is a table of four solutions and their PH values

W X Y Z
8 2 7 13

Which of them is likely to be  

(i) Strongly acidic      

Answer -  X  2

(ii) Neutral 

Answer -  Y   7

(iii) Strongly basic      

Answer -  W   8    

(v) Weakly basic

Answer -  Z  13

Question 3

3(a)(i) What is a Universal Indicator?

Answer - A universal indicator is a mixture of dyes

(ii) Mention the TWO main Laboratory Indicators

Answer - Phenolpthalein, methyl orange

(iii) Give the colour of the Indicator mentioned 

in Acidic

Answer - Pink

Basic

Answer - Yellow

Neutral medium

Answer - Orange

Question 4

a(i) What is an Alkali?

Answer - An alkali is a basic hydroxide which is soluble in water

(ii)Give THREE physical properties of Alkali

Answer -

1. They have soapy feel or touch

2.They turn litmus paper blue

3. Concentrated forms of caustic alkalis are corrosive

(b)How would you prove that Sodium hydroxide is a base without using Litmus paper to test? Give an equation for the reaction

Answer -  E.g. NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

Question 5

(a) Using a well-balanced equation state how NaOH reacts with the following (i) H2SO4   (ii) NH4NO3

Answer - 

 2NaOH + H2SO4  → Na2SO4 + 2H2O

NaOH + NH4HO3  → NaNO3 + NH3 + H2O

(b)Give TWO ways in which a base can be prepared.

Answer - 

(i) Action of a soluble base on water

(ii) Decomposition reaction

Question 1

(a) Define base in terms of the following

(i) Arrhenius  

Answer - Arrhenius defined a base as a substance that produces a hydrous ion (OH-) when dissolved in water or in an aqueous solution e.g. KOH.

(ii) Bronsted-Lowry    

Bronsted-Lowry defined a base as a proton acceptor      

(iii) Lewis

Lewis defined a base as an electron-pair donor  

 

(b)Give two examples each   

(i) Basic Oxide   

Answer - Basic oxide – Na2O, CaO

(ii) Basic Hydroxide

Answer - Basic hydroxide – KOH, NaOH

 

(c)

Answer -

(i) What is Neutralization reaction

Neutralization reaction is a reaction in which acid reacts with a base to form salt and water only.

 

(ii) Using a well-balanced equation give one example of a Neutralization reaction

HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

Question 2

(a)  What do you understand by PH of a solution?

Answer - PH of a solution is a measure of the degree of acidity or alkalinity of the solution

(b)Below is a table of four solutions and their PH values

W X Y Z
8 2 7 13

Which of them is likely to be  

(i) Strongly acidic      

Answer -  X  2

(ii) Neutral 

Answer -  Y   7

(iii) Strongly basic      

Answer -  W   8    

(v) Weakly basic

Answer -  Z  13

Question 3

3(a)(i) What is a Universal Indicator?

Answer - A universal indicator is a mixture of dyes

(ii) Mention the TWO main Laboratory Indicators

Answer - Phenolpthalein, methyl orange

(iii) Give the colour of the Indicator mentioned 

in Acidic

Answer - Pink

Basic

Answer - Yellow

Neutral medium

Answer - Orange

Question 4

a(i) What is an Alkali?

Answer - An alkali is a basic hydroxide which is soluble in water

(ii)Give THREE physical properties of Alkali

Answer -

1. They have soapy feel or touch

2.They turn litmus paper blue

3. Concentrated forms of caustic alkalis are corrosive

(b)How would you prove that Sodium hydroxide is a base without using Litmus paper to test? Give an equation for the reaction

Answer -  E.g. NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

Question 5

(a) Using a well-balanced equation state how NaOH reacts with the following (i) H2SO4   (ii) NH4NO3

Answer - 

 2NaOH + H2SO4  → Na2SO4 + 2H2O

NaOH + NH4HO3  → NaNO3 + NH3 + H2O

(b)Give TWO ways in which a base can be prepared.

Answer - 

(i) Action of a soluble base on water

(ii) Decomposition reaction