Putrajaya Trial 2024 Chemistry Kertas 1

Chemistry

Putrajaya Trial 2024 Chemistry Kertas 1

• Putrajaya Trial
• 40 questions
• With explanations

1

Diagram 1 shows the standard representation of element A. What does the number 23 refer to?

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A Proton number B Nucleon number C Number of electrons D Number of neutrons

T4 Chapter 2.3 Atomic Structure

2

Substance A has a melting point of −94.0 °C and a boiling point of 65.0 °C. What is the state of matter of substance A at room temperature?

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A Solid B Liquid C Gas

T4 Chapter 2.1 Basic Concepts of Matter

3

Why is the carbon-12 atom used as the standard atom? - I. Exists as a solid at room temperature - II. Can easily combine with other elements - III. Exists as a non-metal element - IV. Can conduct electricity

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

T4 Chapter 3.1 Relative Atomic Mass and Relative Molecular Mass

4

Calculate the number of positive ions in 1.5 mol of aluminium oxide.

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A 6.02 × 10²³ B 6.02 × 10²³ × 1.5 C 6.02 × 10²³ × 1.5 × 3 D 6.02 × 10²³ × 1.5 × 2

T4 Chapter 3.2 Mole Concept T4 Chapter 3.3 Chemical Formula

5

In the Modern Periodic Table, the elements are arranged in order of their

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A Nucleon number B Number of neutrons C Proton number D Valence electrons

T4 Chapter 4.2 The Arrangement in the Periodic Table of Elements

6

Which of the following is an ionic compound?

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A NaCl B NH₃ C HCl D CO₂

T4 Chapter 5.2 Ionic Bond T4 Chapter 5.7 Properties of Ionic Compounds and Covalent Compounds

7

Which pair is matched correctly? | | Substance | pH value | |---|---|---| | A | Hydrochloric acid | 4 | | B | Sodium hydroxide | 8 | | C | Ethanoic acid | 6 | | D | Ammonia | 14 |

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A A B B C C D D

T4 Chapter 6.2 pH Value

8

When the temperature of a reacting mixture increases, the rate of reaction increases. Which statement explains why the rate of reaction increases?

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A The total surface area of the reactant particles increases B The total number of reactant particles per unit volume increases C The reactant particles move faster and collide more often with one another D The reactant particles which collide more often are able to overcome a lower activation energy

T4 Chapter 7.4 Collision Theory

9

Which composite material contains a mixture of glass and silver chloride?

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A Fibre glass B Optical fibre C Photochromic glass D Borosilicate glass

T4 Chapter 8.4 Composite Materials and Its Importance

10

Diagram 10 shows the properties of substance X. - Inert towards chemical reactions - A good electrical insulator - High heat resistance - Porous Substance X is probably a type of

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A Alloy B Glass C Ceramic D Metal

T4 Chapter 8.3 Composition of Ceramics and Its Uses

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