Form Three Chemistry Terminal Examination

Form Three Chemistry Terminal Examination

Instructions: Hello students! Please answer all questions to the best of your ability.

Section A (16 Marks)

1. Multiple Choice Questions (10 Marks)

   i. Let's start with balancing equations! Which of the following correctly represents a balanced chemical equation?

   A.  <span class="math-inline">Mg \+ O \\longrightarrow MgO</span>
   
   
   B.  <span class="math-inline">2Mg \+ O\_2 \\longrightarrow 2MgO</span>
   
   
   C.  <span class="math-inline">Mg\_2 \+ O\_2 \\longrightarrow MgO\_2</span>
   
   
   D.  <span class="math-inline">Mg \+ 2O\_2 \\longrightarrow 2MgO</span>
   

   ii. What causes temporary hardness in water? Is it:

   A.  Calcium sulfate
   
   
   B.  Magnesium chloride
   
   
   C.  Calcium bicarbonate
   
   
   D.  Sodium chloride
   

   iii. Which of these is a typical property of acids?

   A.  Turns litmus paper blue
   
   
   B.  Feels slippery
   
   
   C.  Has a sour taste
   
   
   D.  Is alkaline
   

   iv. If you have 24g of carbon, how many moles do you have? (Remember: C = 12)

   A.  0.5
   
   
   B.  1
   
   
   C.  2
   
   
   D.  12
   

   v. Which lab equipment is best for measuring a precise, fixed volume of a solution?

   A.  Beaker
   
   
   B.  Burette
   
   
   C.  Pipette
   
   
   D.  Conical flask
   

   vi. What two types of substances react to form a salt?

   A.  Acid and base
   
   
   B.  Metal and nonmetal
   
   
   C.  Acid and water
   
   
   D.  Base and water
   

   vii. Which of the following is a good example of a displacement reaction?

   A.  <span class="math-inline">A \+ B \\longrightarrow AB</span>
   
   
   B.  <span class="math-inline">AB \\longrightarrow A \+ B</span>
   
   
   C.  <span class="math-inline">A \+ BC \\longrightarrow AC \+ B</span>
   
   
   D.  <span class="math-inline">AB \+ CD \\longrightarrow AD \+ CB</span>
   

   viii. How can we get rid of permanent hardness in water?

   A.  Boiling
   
   
   B.  Adding lime
   
   
   C.  Using a water softener
   
   
   D.  Filtration
   

   ix. In a titration experiment, what's the special point called when the reaction is complete?

   A.  Endpoint
   
   
   B.  Start point
   
   
   C.  Titration point
   
   
   D.  Solution point
   

   x. Which of these solutions is considered a primary standard?

   A.  Sodium hydroxide
   
   
   B.  Hydrochloric acid
   
   
   C.  Sulfuric acid
   
   
   D.  Sodium carbonate
   

2. Matching Items (6 Marks)

   Let's match these chemistry terms in List A with their correct descriptions in List B.

   List A

   i. Catalyst

   ii. Deliquescence

   iii. Neutralization

   iv. Molar mass

   v. Titration

   vi. Efflorescence

   List B

   A. The mass of one mole of a substance

   B. A substance that speeds up a reaction

   C. The process of a substance losing water of crystallization to the atmosphere

   D. Reaction between an acid and a base

   E. The process of a substance absorbing water from the atmosphere and dissolving in it

   F. A volumetric analysis method

Section B (54 Marks)

3. Can you explain the key difference between a balanced and an unbalanced chemical equation? (9 marks)

4. What are three ways we can remove hardness from water? Please describe them. (9 marks)

5. Tell me about the characteristic properties of acids, and what happens when they react with metals. (9 marks)

6. In your own words, define the mole concept and why it's so important in chemistry calculations. (9 marks)

7. Walk me through the steps of how to prepare a standard solution. (9 marks)

8. Why are indicators so crucial when we perform volumetric analysis? Explain their role. (9 marks)

9. Give some real-world examples of how volumetric analysis is used in everyday life. (9 marks)

Section C (30 Marks)

• Instructions: Choose any two of the following essay questions to answer.

10. Let's explore chemical reactions! Discuss the different types, and provide an example for each. (15 marks)

11. Hard water can be a bit of a nuisance. Explain the problems it causes and how we can solve them. (15 marks)

12. What are salts? Describe the different types and how we use them in agriculture and industry. (15 marks