Sarawak Trial 2024 Chemistry Kertas 1 · Kenyalang Set 1

Chemistry

Sarawak Trial 2024 Chemistry Kertas 1 · Kenyalang Set 1

• Sarawak Trial Kenyalang Set 1
• 40 questions
• With explanations

1

Which of the following is an element?

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A Ammonia B Oxygen C Naphthalene D Methane

T4 Chapter 2.1 Basic Concepts of Matter

2

Diagram 1 shows the standard representation of a magnesium atom: $^{24}_{12}\text{Mg}$ What is the number of valence electrons of the atom?

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A 2 B 8 C 12 D 24

T4 Chapter 2.3 Atomic Structure

3

Which of the following statements explains most accurately why carbon-12 was chosen as the standard reference for determining relative atomic mass?

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A Has three isotopes B Non-metal element C Does not easily combine with other elements D Solid at room temperature and can be handled easily

T4 Chapter 3.1 Relative Atomic Mass and Relative Molecular Mass

4

Which of the following is the use of the iodine-131 isotope?

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A Determine the age of fossils B Treat thyroid disorders C Kill cancer cells D Detect leakage of underground pipes

T4 Chapter 2.4 Isotopes and Its Uses

5

Which of the following statements are correct about the physical properties of Group 18 elements when going down the group? I The intensity of colour decreases II The forces of attraction between atoms increase III The density of the elements decreases IV The melting and boiling points of the elements increase

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A I and II B I and III C II and IV D III and IV

T4 Chapter 4.3 Elements in Group 18

6

Diagram 2 shows the apparatus set-up of an experiment to study the reactivity of Group 1 elements towards chlorine gas. What are alkali metals X, Y and Z? | | X | Y | Z | |---|---|---|---| | A | Lithium | Sodium | Potassium | | B | Sodium | Potassium | Lithium | | C | Sodium | Lithium | Potassium | | D | Potassium | Sodium | Lithium |

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A A B B C C D D

T4 Chapter 4.4 Elements in Group 1

7

The oxide of Y is a white solid that is insoluble in water but can react with nitric acid and sodium hydroxide solution. What is element Y?

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A Aluminium B Potassium C Carbon D Magnesium

T4 Chapter 4.6 Elements in Period 3

8

Table 1 shows the positions of elements W, X, Y and Z in the Periodic Table of Elements. | Element | W | X | Y | Z | |---|---|---|---|---| | Group | 1 | 16 | 17 | 14 | | Period | 2 | 2 | 3 | 2 | Which pair of elements forms a compound with a high melting point?

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A W and X B W and Z C X and Z D Y and Z

T4 Chapter 5.7 Properties of Ionic Compounds and Covalent Compounds

9

Diagram 3 shows a type of bond. Which of the following is correct about the bond?

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A A type of bond where the shared electron pairs come from one atom only B A bond formed through the transfer of electrons between metal atoms and non-metal atoms C The forces of attraction between hydrogen and a highly electronegative atom in another molecule D There is electrostatic attraction between the sea of electrons and the positively charged metal ions

T4 Chapter 5.6 Metallic Bond

10

Which of the following statements is correct about simple molecules?

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A Large structure B Low melting and boiling points C Exist as solids only D More heat energy is needed to break the bonds between atoms

T4 Chapter 5.7 Properties of Ionic Compounds and Covalent Compounds

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