1 Which of the following careers is in the field of Chemistry? flag bookmark A Pharmacist B Astronaut C Accountant D Chef T4 Chapter 1.1 Development in Chemistry Field and Its Importance in Daily Life A pharmacist works with medications and chemical compounds, making it a career directly tied to chemistry. The other options do not involve chemical science.
2 Diagram 1 below shows the structure of an atom. What are the subatomic particles in the nucleus? flag bookmark A Only neutron B Neutron and proton C Electron and proton D Electron and neutron T4 Chapter 2.2 The Development of the Atomic Model Protons and neutrons are inside the nucleus, while electrons orbit outside.
3 What is meant by chemical formula? flag bookmark A Number of particles in a compound. B Element symbols in the Periodic Table of Elements. C The representation of a compound uses letters to represent elements and subscript numbers to represent the number of atoms. D Chemical formula that shows the actual number of atoms of each element present in one molecule of an element or compound. T4 Chapter 3.3 Chemical Formula A chemical formula represents a compound using element symbols with subscript numbers to show how many atoms of each element are present.
4 Element T and xenon are located in the same group as in the Periodic Table of Elements. Which of the following are the characteristics of element T? I Consists of monoatomic particle II Liquid at room temperature III Conduct electricity IV Chemically inert flag bookmark A I and II B I and III C I and IV D III and IV T4 Chapter 4.3 Elements in Group 18 Noble gases exist as monoatomic particles and are chemically inert, so I and IV are correct.
5 Diagram 2 shows the formation of a type of bond. Which of the following statements is correct about the bond? flag bookmark A The forces of attraction between hydrogen atoms that have bonded with an atom of high electronegativity in another molecule B Sharing of electrons between non-metal atoms that come from one atom only C The electrostatic forces between the sea of electrons and the positively charged metal ions D Transfer of electrons between metal atoms and non-metal atoms T4 Chapter 5.5 Dative Bond The bond shown is a dative covalent bond, where the lone pair from nitrogen is shared with boron. Both shared electrons come from one atom, making B correct.
6 Diagram 3 shows the ionisation of a substance in water. Which of the following statements about the substance is correct? flag bookmark A The substance has a pH value more than 7 B The substance turns the colour of a moist blue litmus paper to red C The presence of water enables the substance to produce hydroxide ion D The substance reacts with a reactive metal to produce carbon dioxide and water T4 Chapter 6.1 The Role of Water in Showing Acidic and Alkaline Properties The substance produces H⁺ ions, making it an acid that turns moist blue litmus paper red.
7 Diagram 4 shows an apparatus set-up of an experiment that has been carried out by Ahmad. What is the most suitable change that can be measured by Ahmad to determine the rate of reaction in the experiment? flag bookmark A Change in colour of the mixture B Formation of lead(II) chloride C Increase of the volume of sodium nitrate solution D Decrease of the concentration of sodium chloride solution T4 Chapter 7.1 Determining Rate of Reaction The rate can be determined by measuring the time taken for the white precipitate of lead(II) chloride to form, as the reaction produces an insoluble solid.
8 Stainless steel is stronger than pure iron. What is the use of stainless steel? flag bookmark A To make surgicals instrument B To make an aeroplane frame C To make a car frame D To make the trophy T4 Chapter 8.1 Alloy and Its Importance Stainless steel is strong, resistant to corrosion, and safe to sterilize, so it is ideal for surgical instruments that must stay clean and durable.
9 Which of the following is true about reduction reaction? flag bookmark A Increase in oxidation number B Gain of oxygen C Gain of hydrogen D Loss of electron T5 Chapter 1.1 Oxidation and Reduction Reduction involves the gain of hydrogen, so option C is correct. Loss of oxygen or gain of electrons also defines reduction, but gain of hydrogen matches the given choice.
10 Diagram 5 shows the structural formula of an organic compound. What is general formula of the organic compound? flag bookmark A CₙH₂ₙ B CₙH₂ₙ₋₁ C CₙH₂ₙ₊₂ T5 Chapter 2.2 Homologous Series It contains one C=C double bond, so it is an alkene, whose general formula is CₙH₂ₙ.