1 The number of protons and neutrons is known as the flag bookmark A atomic number B nucleon number C electron number D charge number T4 Chapter 2.3 Atomic Structure The nucleon number counts both protons and neutrons together. Atomic number counts only protons, so option B is correct.
2 Diagram 1 shows the arrangement of particles of substance X. What is the state of matter of substance X? flag bookmark A Gas B Solid C Liquid D Liquid-gas T4 Chapter 2.1 Basic Concepts of Matter The particles are far apart and randomly arranged, filling the whole container, which shows the state of matter is gas.
3 Which of the following contains 6.02 × 10²³ mol⁻¹ atoms? flag bookmark A 1 mol of sodium chloride B 1 mol of ozone gas C 1 mol of iron D 1 mol of carbon dioxide T4 Chapter 3.2 Mole Concept 1 mol of iron contains 6.02 × 10²³ atoms because iron exists as single atoms, while NaCl and CO₂ are compounds and ozone contains 3 atoms per molecule.
4 What is the number of mole of 56.4 g copper(II) nitrate, Cu(NO₃)₂? [Relative atomic mass: O = 16, Cu = 64, N = 14] flag bookmark A 3.33 mol B 0.32 mol C 0.45 mol D 0.30 mol T4 Chapter 3.2 Mole Concept Molar mass of Cu(NO₃)₂ = 64 + 2(14 + 3×16) = 188 g/mol. Moles = 56.4 ÷ 188 = 0.30 mol.
5 Table 1 shows noble gas elements and its uses. | | Element | Uses | |---|---|---| | I | Argon | Used in lasers to treat eye retina | | II | Krypton | Used in flashlight of camera | | III | Xenon | To fill in light bulb | | IV | Radon | Used to treat cancer | Which pair is correctly matched? flag bookmark A I and II B I and III C II and IV D III and IV T4 Chapter 4.3 Elements in Group 18 Krypton is used in camera flashlights, and radon is used in cancer treatment, so II and IV are correctly matched.
6 Diagram 2 below shows the electron arrangement of calcium oxide. Which of the following about calcium oxide is **correct**? flag bookmark A Calcium atom shares electrons with oxygen atom. B Calcium atom transfers electrons to oxygen atom. C Oxygen atom donates electrons. D Calcium atom receives electrons. T4 Chapter 5.2 Ionic Bond Calcium loses two electrons to become Ca²⁺, and oxygen gains them to become O²⁻, so electrons are transferred from calcium to oxygen.
7 Which particle causes dilute sulphuric acid to show its acidic property? flag bookmark A H⁺ B OH⁻ C SO₄²⁻ D H₂SO₄ T4 Chapter 6.1 The Role of Water in Showing Acidic and Alkaline Properties Dilute sulphuric acid shows acidic properties because it produces hydrogen ions, H⁺, in water; acids are defined by their ability to release H⁺.
8 Amin has added catalyst into the reaction between zinc and hydrochloric acid. How does the catalyst increase the rate of reaction? flag bookmark A A catalyst increases the activation energy of the reaction B A catalyst provides an alternative pathway with a lower activation energy C A catalyst increases the concentration of the reactants D A catalyst adds heat to the reaction to speed up the rate of reaction T4 Chapter 7.2 Factors Affecting Rate of Reactions T4 Chapter 7.4 Collision Theory A catalyst speeds up a reaction by providing an alternative pathway with a lower activation energy, so more particles have enough energy to react successfully.
9 Helmet made of composite material are a combination of plastic as matrix substance and fiberglass as strengthening material. Which of the following is a basic property of composites? I Low stretching strength II Heat insulator III Resistant to corrosion IV Flexible flag bookmark A I and II B II and III C III and IV D I and IV T4 Chapter 8.4 Composite Materials and Its Importance Composites combine plastic matrix with fiberglass, giving them heat insulation and corrosion resistance. They are strong, not low in stretching strength, and generally rigid rather than flexible.
10 Diagram 3 below shows an apparatus made of glass. Which glass is most suitable to make the above apparatus? flag bookmark A Lead glass B Soda lime glass C Borosilicate glass D Fuse glass T4 Chapter 8.2 Composition of Glass and Its Uses Borosilicate glass withstands high temperatures and thermal shock, making it ideal for laboratory apparatus like test tubes and beakers that are often heated.