Matter and the Atomic Structure

Question 4:Figure 2 shows the nucleus charges of the atoms of elements X, Y and Z.(a) State the subatomic particle that provides the charges in the atoms of the elements.(b) State the other subatomic particle found in the nucleus of the atoms.(c) Write the electron arrangement of the atoms for elements X, Y and Z.(d) … Read more

Question 1:Table 1 shows the melting point and boiling point of substances A, B, C, D and E.(a) Classify substances A, B, C, D and E according to states of matter at room temperature.(b) State the substance that will change from liquid to solid when placed in the freezer at temperature 2 °C.(c) Describe the … Read more

Question 1:Define isotopes. Answer:Isotopes are atoms of the same element with the same proton number / same number of protons but with different nucleon number / number of neutrons. Question 2:Based on Table 2.6, which atoms are isotopes? Explain your answer. Answer:Atoms W and XThis is because the atom W and X have the same … Read more

Test Yourself 2.3:Table 2.3 shows the number of protons and the number of neutrons for elements X, Y and Z.1. What is the nucleon number of atom Y?2. Write the standard representation of element Z.3. Atom Y donates one electron to form ion Y+. State the number of protons, neutrons and electrons for ion Y+.4. … Read more

Activity 2.5:Finding the mystery code 1. In groups, answer the following questions: (a) The nucleon number and the proton number of fluorine element are 19 and 9 respectively. Is the following statement true or false?The atom of this element has 9 electrons and 9 neutrons in its nucleus. (b) Atom X has 11 protons and … Read more

Question 1:Figure 2.10 shows the atomic structure of nitrogen. (a) Name X.(b) State the subatomic particles found in the nucleus of nitrogen atom.(c) Compare X and subatomic particles mentioned in (b) from the aspect of relative charge and relative mass. Answer:(a) Electron(b) Proton and neutron(c) Question 2:• Electrons move around the nucleus in shells. • … Read more

Question 1:State the types of particles that exist in a copper wire. Answer:Atom Question 2:Lily dries her hair with a hair dryer. (a) Name the process involved during hair drying.(b) State the changes in the movement of water particles when hair is dried. Answer:(a) Evaporation(b) Water molecules more freely and faster Question 3: Lauric acid, C12H24O2 … Read more

Activity 2.2:Aim: To determine the melting point and freezing point of naphthalene, C10H8.Materials: Naphthalene, C10H8 and waterApparatus: Boiling tube, 250 cm3 beaker, thermometer, tripod stand, retort stand with clamp, Bunsen burner, stopwatch, conical flask, wire gauze and spatulaProcedure:1. Fill up one third of a boiling tube with naphthalene, C10H8.2. Place a thermometer in the boiling tube.3. … Read more

Questions Which of the following statements is not true? Matter is anything that occupies space and has mass. The particle theory of matter states that matter is made up of a large number of tiny and discrete particles. The kinetic energy of the particles in a matter increases if its temperature increases. The particles in … Read more

Structure Question 4: Figure (a) Figure (b) Figure (a) shows the set-up of the apparatus to investigate the heating process of substance Y. In this experiment, solid substance Y was heated in a water bath from room temperature until it turned into gas. Substance Y was stirred throughout the whole experiment. The temperature of substance … Read more