QUESTION 2   The numbers of electrons, neutrons, a…

  QUESTION 2   The numbers of electrons, neutrons, and protons in four particles, W, X, Y, Z, are shown in the table below.   Particle Electrons Neutrons Protons W 10 12 11 X 10 14 12 Y 16 16 16 Z 18 18 16   2.1 Which particle is a negative ion? (1)   2.2 Which particle is a positive ion? (1)   2.3 Which two particles are isotopes? (1)   2.4 State the group that particle X is found in on the periodic table (1)   2.5 How many energy levels does W have? (1)       [5]

  QUESTION  5   The following question refer to sodi…

  QUESTION  5   The following question refer to sodium chloride, a chemical commonly found in most households.   5.1 Is sodium chloride a mixture or a pure substance? (1)   5.2 What bond is found in sodium chloride? (1)   5.3 What structure does sodium chloride have? (1)   5.4 Draw the dot and cross diagram of only the outer energy shell for sodium chloride (2)   5.5 Explain why sodium chloride conducts electricity when molten. (1)       [6]

10.2 Element Y has 10 protons. Element Z has 11 protons. W…

10.2 Element Y has 10 protons. Element Z has 11 protons. Which statement is correct?   A  Element Z has one more outer electron shell than element Y. B  Element Y is in the same group as element Z. C  Element Z is in the same period as element Y. D  Element Z has the same amount of electrons as element Y. [1]

  QUESTION 1   The table below shows the melting poi…

  QUESTION 1   The table below shows the melting points, boiling points and densities of substances A to D.   Substance Melting point (°C) Boiling point (°C) Density (g.cm-3) A 1110 2606 9.1 B -266 -252 0.07 C 40 94 1.6 D -14 60 0.9       1.1 Which substance is a gas at room temperature? (1)   1.2 Which substance is a liquid at room temperature? (1)   1.3 Which substances are solids at room temperature? (1)   1.4 Which substance will be a liquid at -265°C? (1)   1.5 Which substances are gases at 70°C? (1)   1.6 Dry ice (solid CO2) is often used to cool ice-cream by bicycle driven ice-cream vendors. State the interconversion demonstrated when dry ice forms vapor. (1)   1.7 Explain the changes in particle arrangement that occur during the interconversion stated in 1.6. Explain how this arrangement change affects the properties of the respective states. (2)       [8]